AUTOMATED THERMAL EXCHANGE SYSTEM

Abstract

A system for condensing steam is provided that includes a cooling tank and a condensing coil extending into the cooling tank. Coolant from a source of coolant flows into the tank to cool the condensing coil when the temperature of the coolant in the cooling tank exceeds a predetermined value. A drain is in fluid communication with the cooling tank. An air gap assembly is located between the tank and the source of coolant. The air gap assembly includes an opening to atmospheric air and is constructed and arranged to allow coolant to flow out of the opening air vent when there is a predetermined amount of coolant back flowing into the device.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit under 35 U.S.C. §119(e) of Provisional Application No. 61/611,086 filed Mar. 15, 2012. The disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

This invention relates generally to the cooling of fluids, more particularly, to systems and methods for reducing the temperature of effluents and coolants for devices like autoclaves, steam sterilizers, computers, etc. for delivery of such effluents and/or coolants to a drain or waste vessel while also avoiding cross connections of source coolants to drain or waste connections.

BACKGROUND

Steam sterilizers (also called autoclaves) are used in the medical, dental, veterinarian, spa, ear-piercing and tattoo industries to sterilized instruments used for the patients or clients in order to prevent transfer of disease organisms one to another. Systems for condensing the steam after it is used to sterilize theses instruments may benefit from improvements.

SUMMARY

The following is a brief summary of subject matter that is described in greater detail herein. This summary is not intended to be limiting as to the scope of the claims.

A system for condensing steam is provided that includes a cooling tank and a condensing coil extending into the cooling tank. Coolant from a source of coolant flows into the tank to cool the condensing coil when the temperature of the coolant in the cooling tank exceeds a predetermined value. A drain is fluid communication with the cooling tank. An air gap assembly is located between the tank and the source of coolant. The air gap assembly includes an opening to atmospheric air and is constructed and arranged to allow coolant to flow out of the opening air vent when there is a predetermined amount of coolant back flowing into the device.

In another aspect of the invention, a system for changing the temperature of a fluid is provided that includes a container and a thermal exchange device extending into the container. A source of thermal exchange fluid is in fluid communication with the container. The thermal exchange fluid from the source of thermal exchange fluid flows into the container to change the temperature of the thermal exchange device when the temperature of the thermal exchange fluid in the container reaches a predetermined value. A thermal actuator is operatively connected to a valve. The valve is located between the source of thermal exchange fluid and the container. The valve is operative to be in a closed position blocking the flow of thermal exchange fluid from the source of thermal exchange fluid into the container and an open position allowing the flow of thermal exchange fluid from the source of thermal exchange fluid into the container. The thermal actuator causes the valve to be placed from the closed position to the open position in response to the temperature of the thermal exchange fluid reaching the predetermined value.

In another aspect of the invention, a system for condensing steam is provided. The system includes a cooling tank, a condensing coil extending into the cooling tank, a drain in fluid communication with the cooling tank, a condensate line fluidly connected between the drain and an outlet of the condensing coil, a coolant overflow line fluidly connected between the cooling tank and the drain, a steam line fluidly connected to an inlet of the condensing coil, a source of coolant in fluid communication with the cooling tank, and a thermal actuator operatively connected to a valve. The valve is located between the source of coolant and the cooling tank. The valve is operative to be in a closed position blocking the flow of coolant from the source of coolant into the cooling tank and an open position allowing the flow of coolant from the source of coolant into the cooling tank. The thermal actuator is operatively connected to one of the condensate line, coolant overflow line, and steam line. The thermal actuator causes the valve to be placed from the closed position to the open position in response to the temperature of a fluid in the one of the condensate line, coolant overflow line, and steam line exceeding a predetermined value.

In another aspect of the invention, a system for changing the temperature of a fluid is provided that includes a container, a thermal exchange device extending into the container, and a source of thermal exchange fluid in fluid communication with the container. The thermal exchange fluid from the source of thermal exchange fluid flows into the container to change the temperature of the thermal exchange device when the temperature of the thermal exchange fluid in the container reaches a predetermined value. An air gap assembly located between the container and the source of thermal exchange fluid. The air gap assembly includes an opening to atmospheric air. The air gap assembly is constructed and arranged to allow thermal exchange fluid to flow out of the opening when there is a predetermined amount of thermal exchange fluid back flowing into the device.

Other aspects will be appreciated upon reading and understanding the attached figures and description.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a typical steam condensing system for a cassette style autoclave.

FIG. 2 is a schematic view of a typical steam condensing system for a chamber style autoclave.

FIG. 3 is a schematic view of a steam condensing system for a cassette style autoclave according to an exemplary embodiment of the present invention.

FIG. 4 is a partial front sectional view of portion of the steam condensing system of FIG. 3 showing the manifold assembled to the condensing coil and their related elements.

FIG. 5 is a front and top perspective view of the cooling tank of the steam condensing system of FIG. 3.

FIG. 6 is a front side view of the thermal valve assembly of the steam condensing system of FIG. 3 in the closed position with portions removed away for purposes of illustration.

FIG. 7 is a view similar to FIG. 6 but with the thermal valve assembly in the open position.

FIG. 8 is a front side view of the thermal valve assembly with the adapter of the steam condensing system of FIGS. 20-22 in the closed position with portions removed away for purposes of illustration.

FIG. 9 is an end view taken along lines 9-9 of FIG. 8.

FIG. 10 is a sectional side view of the flow control device of the steam condensing system of FIG. 3 taken along the longitudinal axis of the flow control device.

FIG. 11 is a front side view of the air gap assembly of the steam condensing system of FIG. 3.

FIG. 12 is a rear side view of the top end of the air gap assembly of the steam condensing system of FIG. 3 with the cover cap removed for illustrative purposes.

FIG. 13 is a top view of the top end of the air gap assembly of the steam condensing system of FIG. 3 with the cover cap removed for illustrative purposes.

FIG. 14 is a side view of a portion of the steam condensing system of FIG. 3 showing the drain adapter and related elements connected to the slip joint tee, condensate line, and coolant line.

FIG. 15 is a side view of a portion of the steam condensing system of FIG. 3 showing the drain adapter and related elements connected to the slip joint tee and with portions removed for illustrative purposes.

FIG. 16 is a front side sectional view of a drain adapter for the steam condensing system of FIG. 3 that has straight outlet ports.

FIG. 17 is a front side sectional view of another drain adapter for the steam condensing system of FIG. 3.

FIG. 18a is a side view of the in-line thermal valve assembly in an open position of the system of FIG. 3 with portions removed for illustrative purposes.

FIG. 18b is a view similar to FIG. 18a but with the in-line thermal valve assembly in a closed position.

FIG. 19 is a schematic view of a steam condensing system for a chamber style autoclave according to another exemplary embodiment of the present invention.

FIG. 20 is a schematic view of a steam condensing system for an autoclave according to another exemplary embodiment of the present invention.

FIG. 21 is a schematic view of a steam condensing system for an autoclave according to another exemplary embodiment of the present invention.

FIG. 22 is a schematic view of a steam condensing system for an autoclave according to another exemplary embodiment of the present invention.

FIG. 23 is a schematic view of a system for liquid cooling a computer according to another exemplary embodiment of the present invention.

FIG. 24 is a schematic view of a steam condensing system for an autoclave according to another exemplary embodiment of the present invention.

DETAILED DESCRIPTION

Various technologies pertaining to steam condensing systems will now be described with reference to the drawings, where like reference numerals represent like elements throughout. In addition, several functional block diagrams of example systems are illustrated and described herein for purposes of explanation; however, it is to be understood that functionality that is described as being carried out by certain system components and devices may be performed by multiple components and devices. Similarly, for instance, a component/device may be configured to perform functionality that is described as being carried out by multiple components/devices.

There are generally two types of autoclaves (cassette and chamber). FIG. 1 shows a typical cassette style autoclave 20. Cassette style autoclaves are designed for rapid processing of small volumes of instruments. These designs typically utilize a narrow, elongated, clamshell slide-in cassette constructed of stainless steel that holds the instruments to be sterilized. Cassette style autoclaves have a sterilization or heating chamber and a separate small reservoir for distilled-quality water. When a cycle is started, water is delivered to the sterilization cassette and heated to create steam. Once steam is created, the system is pressurized for a specific period of time to kill organisms. When a cycle is complete, steam and very hot water is discharged from the cassette via a drain port while filtered air at ambient temperature is used to begin to cool the cassette and instruments. The steam and condensate flows via a line 22 to a waste bottle 24. The bottle 24 has a cap 26 with an inlet fitting and an internal copper condensing coil 28. A small amount of cool water is to be manually added to the bottle by the user periodically to cover the lower section of the condensing coil 28 to help begin condensation of the steam and cooling of the condensate or water. As the steam is converted to water, the water rises in the condensing coil 28 and drops out of the end directly into the self-contained bottle 24 adding to the water in the bottle 24.

After a few cycles, an attendant or other person has to remove the cap 26 and condensing coil 28 from the bottle 24 to empty the hot water into a sink or other suitable drain. If the attendant forgets, the excess water will escape via a small pressure relief port located in the cap 26. This overflow creates rotting, warping, delamination and mold in the cabinetry in which it's stored. Additionally, if the number of cycles occurs too quickly in succession, the steam may not have time to condense and thus, the steam and water vapor escapes via the relief port hole in cap 26 also creating moisture damage to the property. Further, the effluent waste or condensate from the system may be too hot to discharge directly to plumbing drains. Moreover, it would be a violation of the plumbing codes to discharge steam and/or water too hot for the plumbing system to drain. Also, this type of waste design also endangers the attendant who must handle extremely hot equipment.

FIG. 2 shows a typical chamber style autoclave 30. Chamber style autoclaves 30 are designed for processing large volumes of instruments and have much longer cycle times. These designs typically resemble a large countertop microwave and have a round or square access door on the front of the autoclave 30. They usually have an internal, cylindrical sterilization chamber 32 constructed of stainless steel with multiple shelves that hold trays or wrapped instruments to be sterilized. Chamber style autoclaves 30 also have a heating chamber and a separate larger reservoir such as a water tank 34 for storing distilled-quality water. When a cycle is started, water is delivered via a line 31 to the sterilization chamber 32 from the water tank by the opening of a solenoid valve 33. The water is heated in the sterilization chamber 32 to create steam. Once steam is created, the sterilization chamber 32 is pressurized for a specific period of time to kill organisms.

When a cycle is complete, a solenoid valve 35 in a line 36 between the water tank 34 and sterilizing chamber 32 is opened and the steam and very hot water is discharged from the sterilization chamber 32 and sent to the water tank 34 while at the same time filtered ambient temperature enters the chamber 32 to begin cooling the cassette and instruments. The water tank 34 contains a copper condensing coil 38 that is immersed in the stored water supply and serves to help condense the steam. The opening and closing of the solenoids is operated by a controller 37. The chamber style autoclave 30 re-uses water for many cycles and does not use a waste bottle. Periodically the attendant must physically drain the entire water tank 34 by use of a drain fitting and clean the water tank 34 and sterilization chamber. Fresh distilled-quality water is added back to the reservoir and the process may continue. This type of system does not present the same problems as the cassette style autoclaves create with use of a waste bottle but does require a great deal of labor to clean the water tank.

Referring to the drawings and initially to FIG. 3, an exemplary embodiment of a steam condensing system 40 is provided to overcome the above mentioned problems of the steam condensing systems for the autoclaves shown in FIGS. 1 and 2. This steam condensing system 40 is used for a cassette type autoclave 42. The condensing system comprises a condensing coil 44, a source of coolant 46, a cooling tank 48, and a drain 50. The cassette type autoclave 42 contains the instruments or other objects that are sterilized by steam. The autoclave 42 includes a heating element 52, sterilization chamber 54 and a separate reservoir 56 for distilled-quality water. This water is heated by the heating element 52 to create the steam that is provided in the sterilization chamber 54 used to sterilize the instruments. The sterilization chamber 54 is provided with the steam and is pressurized for a predetermined time to kill organisms.

A high temperature resistant steam line 58 is fluidly connected between the autoclave 42 and a manifold 60. The manifold 60 is fluidly connected to the condensing coil 44 and mounted on a top wall 62 of the cooling tank 48. As seen in FIG. 4, the manifold 60 includes a head 63 and connecting body 64. When the manifold 60 is mounted to the cooling tank 48, the connecting body 64 extends through a threaded opening 66 (FIG. 5) into the tank 48 and the head 63 abuts the top wall 62. The connecting body 64 may have threads that engage threads 72 in the threaded opening 66 to secure the manifold 60 to the top wall 62 of the tank 48. The lower end of the head includes a groove 68 that receives An O-ring that abuts or pushes against a flange 70 (FIG. 5), which is attach to the top wall 62 and extends around the opening 66, to seal the manifold 60 to the top wall 62 of the tank 48. The threads 72 may be blow molded, rotocasted, machined, molded or otherwise formed in the tank 48 at the opening 66 to engage the threads of the connecting body 64 to secure the manifold 60 to the top wall of the tank. Alternatively, the manifold 60 may be mounted to the tank 48 by other ways. For example, the manifold 60 may be bolted to the tank using a bolt down method. The manifold 60 may be made of polyethylene, polypropylene or other suitable material.

The manifold 60 includes a first inlet port 74 provided on top of the head 63 and is in fluid communication with the steam line 58 (FIG. 3). A high temperature resistant Kynar® fitting 76 is fluidly connected to the steam line 58 and is threadibly mounted in the first inlet port 74 to provide thermal protection from the steam or hot fluid. The high temperature resistant material may be Kynar®, brass or other suitable material that resists high temperatures. The first inlet port 74 fluidly communicates with a first outlet port 78 provided on the bottom of the connecting body 64. The first outlet port 78 is fluidly connected to the condensing coil 44 by a first brass compression fitting adapter 80. The first fitting adapter 80 is secure to the inlet 81 of the condensing coil 44 and threadibly mounted in the first outlet port 78.

The condensing coil 44 is generally comprised of copper or other suitable thermal transfer material and extends downwardly near bottom wall 79 of the cooling tank 48 as seen in FIG. 3. The number of turns 82 on the coil 44 helps the steam to condense as it flows through the coil 44. The number of coils may vary depending on the system. The outlet 83 of the condensing coil 44 is fluidly connected to a second brass compression fitting adapter 84. The second fitting adapter 84 is threadibly mounted in a second input port 86 provided on the bottom of the connecting body 64. The second input port 86 fluidly communicates with a second outlet port 88 provided on the top of the head 63 of the manifold 60. A standard temperature fitting 90 is threadibly mounted in the second outlet port 88 and fluidly connected to an elbow fitting 92. The elbow fitting is fluidly connected to a condensate line 96 (FIG. 3), which is connected to the drain 50.

Referring to FIG. 5, the cooling tank 48 is generally comprised of plastic such as polyethyene and is shaped in the form of a right triangle. This shape allows for efficient or space saving placement of the tank in a corner of the cabinet or along a flat surface of a side wall of the cabinet. For mounting the tank to the side wall of the cabinet, the mounting structure may include, for example, threaded inserts in the sides of the tank to receive machine screws, which are hung on a hanger tab mounted on the side wall of the cabinet. The triangular shape design also allows for maximum efficiency for packaging and shipping considerations, since little space is wasted. The cooling tank 48 may be in the form of other shapes to fit into suitable structures. For example, the cooling tank may be rectangular in shape and mounted on the side wall. The cooling tank 48 includes the top and bottom walls 62, 79 and right, left, and rear side walls 98, 100, 102 (as viewed in FIGS. 1 and 5). The right and left side walls 98, 100 are generally at a right angle with respect to each other. The side walls may include removable plates 104 for additional protection.

The cooling tank 48 contains coolant such as water that substantially surrounds the condensing coil 44 in a coolant bath to cool the condensing coil 44 heated by the steam flowing through the condensing coil 44. The coolant source 46 may be a cold water line from a sink 105 as shown in FIG. 1. A separate coolant line 106 is fluidly connected to the cold water line 46. A manually operated in-line shut off valve 108 is provided in the coolant line 106 to selectively allow the flow of water through the coolant line 106 from the cold water line 46. The coolant line 106 is fluidly connected to a barbed inlet 120 (FIG. 6) of a water valve 114 (FIGS. 6 and 7)) of a thermal valve assembly 112.

Referring to FIGS. 6 and 7, the thermal valve assembly 112 includes the water valve 114 and a thermal actuator 116. The water valve 114 includes a valve body 118, the barbed inlet 120 and a barbed outlet 122. A valve poppet 110 is slidingly received in a bore 124 of the valve body 118. The bore 124 axially extends from the inlet 120 to past the outlet 122. A return spring 125 is provided between the head 128 of the valve 114 and an end portion of the valve body 118 at the inlet 120. The bore 124 is in fluid communication with the inlet 120 and outlet 122. The head 128 of the valve poppet 110 has a larger diameter than that of the bore 124. The valve poppet 110 axially moves within the bore 124 to place the valve 114 between a closed position (FIG. 6) and an open position (FIG. 7). In the valve's closed position as seen in FIG. 6, the head 128 of the valve poppet 110 engages the funnel shaped seat 130 of the bore 124 to block the inlet of the bore 124 and prevent water from the coolant line 106 from flowing through the bore 124 and the outlet 122 of the valve 114. In the open position as seen in FIG. 7, the head 128 of the valve poppet 110 moves upstream off of the seat 130 to allow water to flow from the coolant line 106 into the inlet 120 and the bore 124 and through the outlet 122 of the valve 114. The valve poppet 110 extends through a threaded cylindrical end 132 of the valve body 118.

The valve 114 is secured to the thermal actuator 116. In particular, the threaded end 132 of the valve 114 extends into a stem 134 of the thermal actuator 116 and threadibly engages threads in the inner side 136 (FIG. 7) of an end of the stem 134. Alternatively, the stem 134 and the valve body 118 may be attached by other suitable ways or may be formed in one piece. The thermal actuator 116 includes a movable piston 138 located in the stem 134 and engages wax 140 in a wax cup 142 at the lower end of the piston 138. The wax 140 may be a paraffin wax of an oil base or any other type of wax that expands when heated. Other suitable types of material that expand when heated may be used instead of the wax. The piston 138 extends through a return coil spring 144 and is secured to the spring 144. The lower end of the spring 144 is secured to a base or wax cup 142 of the thermal actuator 116. A diaphragm 141 is secured to the wax cup 142 and provided inside the wax cup 142 between the wax 140 and the lower end of the piston 138. The diaphragm 141 may be made of rubber or other suitable flexible material. The wax 140 expands as it is heated and pushes the diaphragm upwardly which in turn flexes and pushes the piston 138 upwardly. When the temperature in the expanded wax decreases, the wax 140 contracts and the diaphragm retracts back down to allow the return spring 144 to urge the piston 138 downwardly.

The stem 134 includes a lateral sight opening 146 at the upper end of the piston 138 for viewing the position (actuating or non-actuating) of the piston 138. The thermal valve assembly 112 is configured such that the valve 114 is placed in the open position when the water in the tank is heated to the predetermined temperature that is too high to help condense the steam. In particular, the water, which is heated at the predetermined temperature, causes the wax 140 to expand at a sufficient amount to overcome the biasing force of the spring 144 and move the piston 138 upwardly until it engages the poppet 110 and moves the head 128 of the poppet off of the seat 130 to allow water to flow from the coolant line 106 into the inlet 120 and the bore 124 and through the outlet 122 of the valve 114. When the water is below the predetermine value, the valve 114 is in the closed position in which the head 128 engages the seat 130 to block the water from flowing into the bore 124 and through the outlet 122.

The thermal actuator 116 includes a threaded base 148 that is threadibly secured into a threaded opening 150 (FIG. 5) in the top wall 62 of the cooling tank 48 such that the wax cup 142 is inserted into the water of the cooling tank 48. Referring to FIGS. 8 and 9, a cylindrical adapter 152 may be removably connected to the thermal valve assembly 112 so that the thermal actuator 116 may be used to monitor the temperature of the water in a line. In particular, the adapter 152 includes a lateral bore 154 extending radially through the adapter 152. The bore 154 has threaded inlet and outlet ports 158, 160 that are configured to threadibly engage respective male fittings connected to the line. The adapter 152 also includes a threaded axial bore 156 that is perpendicular to the lateral bore 154 and is in fluid communication with the lateral bore 154. The base 148 of the thermal actuator is threadibly secured to the axial bore such that the wax cup 142 extends into the lateral bore 154 to monitor the temperature of the water flowing through the line and the lateral bore 154. The adapter 152 may be made of brass or other suitable material.

A coolant line 162 (FIG. 3) is fluidly connected between the outlet 122 of the valve 114 and an inlet 164 of a flow control device 166, which controls the flow of water to a predetermined value such as 200 or 300 ml/minute. Specifically, as seen in FIG. 10, the flow control device 166 may include a cylindrical housing 168 with an axial bore 170 having the inlet 164 and an outlet 172. A rubber flow control button 174 is provided in the bore 170 and is sufficiently ported and sized to control the flow of water at a specific flow rate for a wide range of fluid pressures. The controlled flow of water into the cooling tank 48 is set to ensure optimal thermal reduction of the condensate and overflow water to the drain and protects plumbing components while also optimizing and minimizing the use of water.

Coolant line 176 is fluidly connected between the outlet 172 of the flow control device and an inlet 177 of an air gap assembly or air gap assembly 180. Referring to FIG. 11, the air gap assembly 180 includes a generally Y-shaped tubular housing 182. The housing 182 may be made of a thermoplastic material such as Ultra-high-molecular-weight polyethylene or other suitable material. The housing 182 includes a riser tube 184, an inlet branch 186, and an outlet branch 188. The inlet and outlet branches 186, 188 merged into the riser tube 184. The outlet branch 188 has a larger diameter or cross section than that of the inlet branch 186. The riser tube 184 includes a top end 189 that has an oval shaped lateral pressure relief openings 190, 192 (FIGS. 11 and 12) on opposite sides of the top end 189. As seen in FIG. 13, an inner cap 194 is inserted into the top opening of the riser tube 184 and snap fitted to the riser tube 184 by tabs 196 that engage the upper ends of the lateral openings 190, 192. The tabs 196 may be integrally molded on the inner cap 194. The inner cap 194 is spaced radially inward from opposite sides of the riser to define arcuate air gaps 197, 199. The inner cap 194 deflects water flowing up the riser to the lateral openings 190, 192.

Referring to FIG. 11, a decorative cover cap 198 press fits or friction fits on the top end 189 to cover the top end 189. The cover cap 198 includes a generally rectangular shaped opening 200 that may be aligned over one of the relief openings 190, 192. The cover cap 198 is generally cylindrical and may be metallic or chrome like in appearance for aesthetics. The lower end of the cover cap 198 abuts a plastic upper flange nut 202 that threadibly engages a threaded portion 204 on the riser 184. A plastic lower flange nut 206 threadibly engages the threaded portion 204 downwardly opposite the upper flange nut 202. The flange nuts 202, 206 clamp upon a support surface 208 (FIG. 3) such as the lip of a sink or a countertop to secure the air gap assembly 180 to the support surface 208. The air gap assembly 180 may be configured to fit in the sprayer hole of a standard sink. A rubber washer 210 may be inserted between the upper flange nut 202 and support surface 208.

The inlet branch 186 includes a barbed end 212 that is attached to one end of a tubular adapter 214. The tubular adapter 214 may be made of a flexible clear plastic material such as polyvinyl chloride. A barbed adapter 216 is attached to the other end of tubular adapter 214. The tubular adapter 214 may be attached to the barbed end 212 and the barbed adapter 216 by thermal fusion. For example, the tubular adapter 214 may be heated near its melting point. The melting point of the tubular adapter 214 is lower than that of the barbed end 212 and barbed adapter 216. The barbed end 212 and the barbed adapter 216 are then inserted into their respective ends of the tubular adapter 214. The barbed adapter 216 is inserted such that the barbs 218, 220 in them dig into the inner surface of the tubular adapter 214 so that the melted material of the tubular adapter 214 surrounds the barbs 218, 220. Upon cooling, the melted material hardens to fuse and secure the barbed end 212 and the barbed adapter 216 to the tubular adapter 214. Alternatively, the barbed end 212 and the barbed adapter 216 could be first inserted into the tubular adapter 214 and then have heat applied to the tubular adapter 214 to melt and fuse the plastic material from the tubular adapter 214 to the barbed end 212 and barbed adapter 216.

Alternatively, the barbed end 212 and the barbed adapter 216 may be heated to a temperature near the melting point of the tubular adapter 214. The barbed end 212 and the barbed adapter 216 are then inserted into their respective ends of the tubular adapter 214. The plastic material in the tubular adapter 214 is melted as the barbed end 212 and the barbed adapter 216 are inserted such that the barbs 218, 220 in them dig into the inner surface of the tube so that the melted material surrounds the barbs 218, 220. Upon cooling, the melted material hardens to fuse and secure the barbed end 212 and the barbed adapter 216 to the tubular adapter 214. A tubular fitting 222 is threadibly secured into the barbed adapter 216 and serves as the inlet 177 of the air gap assembly 180. The coolant line 176 is fluidly connected to the fitting 222.

The outlet branch 188 also includes a barbed end 224 that is attached to one end of a tubular adapter 226. The tubular adapter 226 may be made of a flexible clear plastic material such as polyvinyl chloride. A barbed adapter 228 is attached to the other end of tubular adapter 226. The tubular adapter 226 may be attached to the barbed end 224 and the barbed adapter 228 by thermal fusion. For example, the tubular adapter 226 may be heated near its melting point. The melting point of the tubular adapter 226 is lower than that of the barbed end 224 and barbed adapter 228. The barbed end 224 and the barbed adapter 228 are then inserted into their respective ends of the tubular adapter 226. The barbed adapter 228 is inserted such that the barbs 230, 232 in them dig into the inner surface of the tubular adapter 226 so that the melted material of the tubular adapter 226 surrounds the barbs 230, 232. Upon cooling, the melted material hardens to fuse and secure the barbed end 224 and the barbed adapter 228 to the tubular adapter 226. Alternatively, the barbed end 224 and the barbed adapter 228 could be first inserted into the tubular adapter 226 and then have heat applied to the tubular adapter 226 to melt and fuse the plastic material from the tubular adapter 226 to the barbed end 224 and barbed adapter 228.

Alternatively, the barbed end 224 and the barbed adapter 228 may be heated to a temperature near the melting point of the tubular adapter 226. The barbed end 224 and barbed adapter 228 are then inserted into their respective ends of the tubular adapter 226. The plastic material in the tubular adapter 226 is melted as the barbed end 224 and barbed adapter 228 are inserted such that the barbs 230, 232 in them dig into the inner surface of the tube so that the melted material surrounds the barbs 230, 232. Upon cooling, the melted material hardens to fuse and secure the barbed end 224 and the barbed adapter 228 to the tubular adapter 226. Alternatively, the barbed end 224 and the barbed adapter 228 could be first inserted into the tubular adapter 226 and then have heat applied to the tubular adapter 226 to melt and fuse the plastic material from the tubular adapter 226 to the barbed end 224 and barbed adapter 228. Alternatively, the tubular adapter 226 may be heated instead of the barbed end 224 and the barbed adapter 228. A tubular fitting 234 is threadibly secured into the barbed adapter 228 and serves as the outlet 236 of the air gap assembly 180. A coolant line 238 (FIG. 3) is fluidly connected to the fitting 234. The tubular adapters 214, 226 allow for the use of standard male and female plumbing fittings and standard tubing sizes.

The air gap assembly 180 allows water to flow out of the lateral openings 190, 192 and air gaps 197, 199 at the top end 189 of the riser 184 and opening 200 of the cover cap 198, when there is a predetermined amount of water back flowing through the device. This prevents the water from backing up into the water line 46 and causing cross contamination and code violations. The openings and air gaps and their location thereof also allow operation of the cooling system at atmospheric pressure.

To install the air gap assembly 180, the cover cap 198 and the upper flange nut 202 are removed and from beneath the sink 105, the riser 184 is inserted into and up through a hole in the support surface 208 until the lower flange nut 206 abuts the underside of the support surface 208. The rubber washer 210 may then be inserted around the riser 184 positioned on top of the support surface 208. The upper flange nut 202 is then threadibly inserted over and down the threaded portion 204 until the upper flange nut 202 rests upon the rubber washer 210. The cover cap 198 is then friction fitted on the riser 184.

Referring to FIG. 3, the coolant line 238 is fluidly connected between the outlet 236 of the air gap assembly 180 and a male connector 240 that is threadibly secured in a threaded coolant inlet opening 242 (FIG. 5) in the top wall 62 of the cooling tank 48. A coolant riser 244 is fluidly connected to the male connector 240 and extends downwardly near the bottom wall 79 of the cooling tank 48. The coolant riser 244 may be made of polypropylene or other suitable material. The coolant inlet opening 242 is located near the left and rear corner of the cooling tank 48.

As depicted in FIGS. 3 and 5, a threaded coolant overflow opening 246 is provided in the top wall 62 of the cooling tank 48 and is located near the right and rear corner of the cooling tank 48. A male connector 248 is threadibly secured in the overflow opening 246 and is fluidly connected to an elbow 249. The coolant overflow opening 246, the coolant inlet opening 242, and threaded opening 150 for the thermal valve assembly 112 are positioned with respect to each other such that the average water temperature in the cooling tank 48 is monitored by the thermal actuator 116 for a more accurate temperature control of the system. Cool and hot areas in the water of the tank are not monitored. In particular, as seen in FIG. 5, the opening 150 is located at the midpoint between the coolant overflow opening 246 and the coolant inlet opening 242 near the rear or hypotenuse side of the cooling tank 48. The opening 150 for the thermal actuator valve assembly is also located rearwardly opposite the opening 66 for the manifold 60, which is located at the front corner of the cooling tank 48 at the junction of the right and left side walls 98, 100.

A coolant overflow or drain line 250 (FIG. 3) is fluidly connected to the elbow 249 and a first threaded inlet port 254 of a dual drain adapter 256. The drain adapter 256 may be made of a thermoplastic material such as ultra-high-molecular-weight polyethylene or other suitable material. Referring to FIG. 17, the drain adapter includes first and second threaded inlet ports 254, 258 and first and second outlet ports 260, 262. The inlet ports 254, 258 have a larger diameter than that of their respective outlet ports 260, 262. The first inlet port 254 is in fluid communication with the first outlet port 260. The first outlet port 260 tapers toward the first inlet port 254. A floating hollow ball 264 is provided in the first outlet port 260 and acts as a check valve to prevent back flow of the water. Specifically, during the normal flow of water the ball 264 is located away from the seat 266 of the first outlet port 260 to allow water to flow to the drain 50 through the space between the first outlet port 260 and the ball 264. If a back flow of water occurs, the water moves the ball 264 toward the seat 266 until it engages the seat 266 to block the water from flowing back to the cooling tank 48.

The second inlet port 258 is in fluid communication with a second outlet port 262. The second outlet port 262 tapers toward the second inlet port 258. A floating hollow ball 268 is provided in the second outlet port 262 and acts as a check valve to prevent the back flow of the water. Specifically, during the normal flow of water, the ball 268 is located away from the seat 270 of the second outlet port 262 to allow water to flow to drain 50 through the space between the second outlet port 262 and the ball 268. If a back flow of water occurs, the water moves the ball 268 toward the seat 270 until it engages the seat 270 to block the water from flowing to the cooling tank 48. Both of the balls 264, 268 are retained in their respective outlet ports 260, 262 by a stainless steel drive pin 272. Other types of check valves may be used instead of the ball such as spring loaded poppets. Alternatively, the drain adapter may have straight outlet ports as shown in FIG. 16.

Referring to FIGS. 14 and 15, the drain adapter 256 is inserted into an inlet 273 of a slip joint tee 274 that is fluidly connected in the drain line 50 of the sink 105. The drain adapter 256 flares outwardly at its inlet 275 to define a shoulder 279. The shoulder 279 engages a compression nut 276 secured to the inlet 273 of the slip joint tee 274 to prevent further insertion of the drain adapter 256 into the inlet 273. The compression nut 276 is inserted around the inlet 273 and drain adapter 256 and secures the drain adapter 256 to the inlet 273 of the slip joint tee 274. A compression seal washer 278 is provided between the outer surface of the drain adapter 256 and inner surface of the inlet to seal the drain adapter 256 to the inlet 273.

As seen in FIGS. 14 and 17, the first input port threadibly receives a male fitting 280 secured to the overflow line 250 to fluidly connect the overflow line 250 to the drain adapter 256. The second input port 258 threadibly receives a male fitting 282 secured to the overflow line 250 to fluidly connect the condensate line 96 to the drain adapter 256. The system 40 also includes an in-line thermal valve assembly 284 (FIG. 3) located in the condensate line 96 that monitors and blocks condensate flow to the drain 50 if the temperature of the condensate in the condensate line 96 exceeds a predetermined value. Specifically, as seen in FIGS. 18a and 18b, the inline thermal valve assembly 284 includes a cap 286 and a body 288. The body 288 includes a threaded inlet opening 290 that threadibly receives a male fitting 292, which is fluidly connected to the condensate line 96. The inlet opening 290 is in fluid communication with a chamber 294. The chamber 294 houses a thermal actuator 296. The thermal actuator 296 includes a movable piston 298 that engages wax 300 in a wax cup 302 at the upstream end of the piston 298. The wax 300 may be a paraffin wax of an oil base or any other type of wax that expands when heated. Other suitable types of material that expand when heated may be used instead of the wax. The piston 298 extends through a return coil spring 304 and is secured to spring 304. The upstream end of the spring 304 is secured to a base 306 or the wax cup of the thermal actuator 296.

The wax cup 302 is exposed to the condensate in the chamber 294. A diaphragm 301 is secured to the wax cup 302 and provided inside the wax cup 302 between the wax 300 and upstream end of the piston 298. The diaphragm 301 may be made of rubber or other suitable flexible material. The wax 300 expands as it is heated and pushes the diaphragm 301 which in turn flexes and pushes the piston 298 downstream. When the temperature in the expanded wax decreases, the wax 300 contracts and the diaphragm 301 retracts back down to allow the return spring 304 to urge the piston 298 in the upstream direction. When the temperature in the expanded wax decreases, the wax contracts to allow the return spring 304 to urge the piston 298 in the upstream direction. The body 288 may be constructed of clear polyvinyl chloride or other clear material for viewing the position of the piston 298. A cylindrical retainer 308 extends around the wax cup and radially extends outwardly to the inner surface of the chamber 294. The retainer 308 holds the thermal actuator 296 in place so that the piston 298 is aligned with an outlet port 310 of the chamber 294. Four bypass holes 312 extend axially through the retainer and are spaced circumferentially equally from each other. The number and size of the bypass holes may vary according to the system.

The cylindrical cap 286 includes an inlet opening 314 in fluid communication with a threaded outlet opening 316. The outlet opening 316 threadibly receives a hollow male fitting 318, which is fluidly connected to the condensate line 96. The cap 286 of the in-line thermal valve assembly 284 is threadibly secured to the body 288. An O-ring seal 321 is provided between the cap 286 and the body 288 to seal them from the water. When the cap 286 and the body 288 are threadibly connected to each other, the outlet port 310 of the chamber is in fluid communication with the inlet opening 314 of the cap 286. During normal operation as seen in FIG. 18a, the piston 298 is spaced from the outlet port 310 to place the in-line thermal valve assembly 284 in the open position. In the open position, the condensate from the condensate line 96 flows through the fitting 292 in the inlet opening 258 and into the chamber 294. The condensate then flows through the bypass holes and outlet port of chamber. The condensate then flows out of the fitting 318 in the outlet opening 316 of the cap 286 and into the condensate line 96 and to the drain 50.

The thermal actuator 296 is constructed such that when condensate in the chamber 294 is at a predetermined temperature that could cause damage to the elements of the drain, the wax expands and causes the piston 298 to move in the downstream direction and block the outlet port 310 as seen in FIG. 18b. This places the in-line thermal valve assembly 284 in the closed position and prevents the condensate from flowing to the drain 50. A sensor 320 may also be operatively connected to the in-line thermal valve assembly 284 or condensate line 96 or 396 to detect that the condensate is at or above the predetermined temperature or that the outlet port 310 is blocked by the piston 298. The sensor 320 may be operatively connected to a display 322 and cause the display 322 to display an error message in response to this condition. The sensor 320 may also be operatively connected to the autoclave and cause the autoclave to stop its current cycle in response to this condition. The sensor 320 may, for example, be a pressure sensor operatively connected to the condensate line 96 that detects back pressure in the condensate line 96 created by the blocking of the outlet port 310 by the piston 298. Alternatively or in addition, the sensor may be operatively connected to a warning light, audible device, or other suitable indicator to indicate that the condensate is at the temperature in which the steam and/or heated water vapor in the condensate line 96 could cause elements of the drainage system to melt or be damage.

The retraction and resetting of the piston 298 may be accomplished by allowing time for the fluid in the chamber to cool or manually by opening the body 288, cooling the wax by use of cold water (which will retract the piston in seconds), placing the wax back into the chamber 294, closing the body 288, and then re-installing the in-line thermal valve assembly 284 in the condensate line 96. The in-line thermal valve assembly size, inlet and outlet connection size, flow rate capacity, and thermal activation set point of the wax motor may all be adjusted as required by specific application.

Referring to FIG. 3, the system operates as follows. The cooling tank 48 initially contains cold water before sterilization begins. Also, the shut off valve 108 is turned on to allow water to flow to the valve 114 of the thermal valve assembly 112. During sterilization of the instruments in the autoclave, water in the reservoir 56 is heated by the heating element 52 to create the steam that is used to sterilize the instruments. The sterilization chamber 54 containing the instruments is provided with the steam and is pressurized for a predetermined time to kill organisms. The steam is directed through the steam line 58 and through the first inlet and outlet ports 74, 78 of the manifold 60 and into the condensing coil 44. The cold water surrounding the condensing coil 44 helps condensation of the steam traveling through the condensing coil 44. This water is heated by the coil 44 as the steam travels through the coil 44. The steam condenses into condensate which flows through the second inlet and outlet ports 86, 88 to the manifold 60 and into the condensate line 96. The condensate then flows through the in-line thermal valve assembly 284 and drain adapter 256 and then to the drain 50.

When the water is heated to the predetermined temperature that is too high to help condense the steam and/or that may cause damage to the system from the condensate, the thermal actuator 116 operates to place the valve 114 in the open position as previously mentioned. Cool water from the cold water line 46 then flows out of the valve and through the flow control device 166 and the air gap assembly 180. The water then flows down from the air gap assembly 180 by gravity and through the riser tube 244 and into the cooling tank 48. As the cool water flows into the cooling tank 48, the cool water displaces the warmer water which flows out of the overflow opening 246. The warmer water flows through the overflow line 250, the drain adapter 256 and to the drain 50. This lowers the temperature of the water in the cooling tank 48 to further help condense the steam and lowers the temperature of the condensate to a value that prevents damage to the components of the drain. When the temperature of the water in the cooling tank 48 lowers below the predetermined temperature, the wax 140 contracts to place the valve 114 in the closed position to block the cool water from the cold water line from entering the cooling tank 48.

If the water in the cooling tank 48 back flows through the riser 244 and the line 238, the water will flow through the lateral openings 190, 192 and air gaps 197, 199 and out of the opening 200 of the air gap assembly 180. This will also visually alert a user of this condition. The air gap assembly 180 is designed so that the cooling system operates completely at atmospheric pressure. Since the air gaps and openings in the air gap assembly are at the inlet side of the system (before the cool water flows into the tank), nothing can cross connect and no additional back flow prevention device is needed.

FIG. 19 shows another exemplary system 401 that is used with a chamber style autoclave. The chamber style autoclave is similar to FIG. 2, except that the outlet 323 of the coil 38 is fluidly connected to the line 324 that is fluidly connected to the inlet port 74 of the manifold 60. This condensing coil 38 serves to further condensate the steam and cool the condensate prior to its entry in to the cooling tank 48. In this way, less coolant water is used and the entire system stays cooler. Alternatively, the coil 38 may be removed and the line 36 may instead be fluidly connected directly to the inlet port 74 of the manifold 60. In all other aspects, the exemplary system is similar in structure and function to that shown and described in FIG. 3.

FIG. 20 shows an exemplary steam condensing system 400 in which the thermal valve assembly 112 with the cylindrical adapter 152 is fluidly connected in the steam line 58 for monitoring the temperature of the fluid and/or gas from the autoclave. In operation, when the temperature of the water and/or gas in the steam line 58 is at or above a predetermined temperature, the thermal actuator 116 operates to place the valve 114 in the open position as previously mentioned. Cool water from the cold water line 46 then flows out of the valve 114 and through the flow control device 166 and the air gap assembly 180. The water then flows down from the air gap assembly 180 by gravity and through the riser tube 244 and into the cooling tank 48. As the cool water flows into the cooling tank 48, the cool water displaces the warmer water which flows out of the overflow opening 246. The warmer water flows through the overflow line 250, the drain adapter 256 and to the drain 50. This lowers the temperature of the water in the cooling tank 48 to further help condense the steam and lowers the temperature of the condensate to a value that prevents damage to the components of the drain 50. When the temperature of the water and/or gas in the steam line 58 lowers below the predetermined temperature, the wax 140 contracts to place the valve 114 in the closed position to block the cool water from the cold water line 46 from entering the cooling tank 48. In all other aspects, the exemplary steam condensing system 400 is similar in structure and function to that shown and described in FIG. 3.

FIG. 21 shows an exemplary steam condensing system 410 in which the thermal valve assembly 112 with the cylindrical adapter 152 is fluidly connected in the overflow line 250 for monitoring the temperature of the water in the line 250. In operation, when the temperature of the water in the overflow line 250 is at or above a predetermined temperature, the thermal actuator 116 operates to place the valve 114 in the open position as previously mentioned. Cool water from the cold water line 46 then flows out of the valve 114 and through the flow control device 166 and the air gap assembly 180. The water then flows down from the air gap assembly 180 by gravity and through the riser tube 244 and into the cooling tank 48. As the cool water flows into the cooling tank 48, the cool water displaces the warmer water which flows out of the overflow opening 246. The wanner water flows through the overflow line 250, the drain adapter 256 and to the drain 50. This lowers the temperature of the water in the cooling tank 48 to further help condense the steam and lowers the temperature of the condensate to a value that prevents damage to the components of the drain. When the temperature of the water in the overflow line 250 lowers below the predetermined temperature, the wax 140 contracts to place the valve 114 in the closed position to block the cool water from the cold water line 46 from entering the cooling tank 48. In all other aspects, the exemplary steam condensing system 410 is similar in structure and function to that shown and described in FIG. 3.

FIG. 22 shows an exemplary steam condensing system 420 in which the thermal valve assembly 112 with the cylindrical adapter 152 is fluidly connected in the condensate line 96 for monitoring the temperature of the condensate in the line 96. In operation, when the temperature of the condensate in the condensate line 96 is at or above a predetermined temperature, the thermal actuator 116 operates to place the valve 114 in the open position as previously mentioned. Cool water from the cold water line 46 then flows out of the valve 114 and through the flow control device 166 and the air gap assembly 180. The water then flows down from the air gap assembly 180 by gravity and through the riser tube 244 and into the cooling tank 48. As the cool water flows into the cooling tank 48, the cool water displaces the warmer water which flows out of the overflow opening 246. The warmer water flows through the overflow line 250, the drain adapter 256 and to the drain 50. This lowers the temperature of the water in the cooling tank 48 to further help condense the steam and lowers the temperature of the condensate to a value that prevents damage to the components of the drain. When the temperature of the condensate in the condensate line 96 lowers below the predetermined temperature, the wax 140 contracts to place the valve 114 in the closed position to block the cool water from the cold water line 46 from entering the cooling tank 48. In all other aspects, the exemplary steam condensing system 420 is similar in structure and function to that shown and described in FIG. 3.

FIG. 23 shows an exemplary system 430 that is used to liquid cool a computer 340. In this system, liquid used to cool the computer flows through the line 358 and through the first inlet and outlet ports 74, 78 of the manifold 60 and into the condensing coil 44. The cold water surrounding the condensing coil 44 helps cool the liquid traveling through the condensing coil 44. This water is heated by the coil 44 as the liquid travels through the coil 44. The liquid flows through the second inlet and outlet ports 86, 88 of the manifold 60 and into the line 396, which is routed through the computer 340 and is in fluid communication with the line 358. A pump 360 in the line 396 draws the cooled liquid into a reservoir 362 in the line 396 and pumps the liquid through the line 396 to the computer 340 to cool the computer 340. A check valve 364 may be provided in the line 396 upstream of the pump 360 and reservoir 362 to prevent back flow of the liquid. In all other aspects, the exemplary system 430 is similar in structure and function to that shown and described in FIG. 3.

FIG. 24 shows another exemplary steam condensing system 440 in which the air gap assembly 180 is removed such that the outlet 172 of the flow control device 166 is directly fluidly connected via a line to the male connector 240, which is fluidly connected to the coolant riser 240. In all other aspects, the exemplary system is similar in structure and function to that shown and described in FIG. 3. The air gap assembly 180 may also be removed in each of the exemplary embodiments of FIGS. 19-23 such that the outlet 172 of the flow control device 166 is directly fluidly connected via a line to the male connector 240, which is fluidly connected to the coolant riser 240 for each embodiment. In all other aspects, this exemplary system is similar in structure and function to the associated embodiment shown and described in FIGS. 19-23.

The steam condensing system 40 is installed as follows. First, the cooling tank 48 is filled with cold tap water. The threaded base 148 of the thermal actuator is then threadably inserted into the threaded opening 150 (FIG. 5) in the top wall 62 of the cooling tank 48 and tightened with a wrench such that the wax cup 142 is inserted into the water of the cooling tank 48. The manifold 60 is attached to the condensing coil 44 and the coil 44 is lowered through the threaded opening 66. The manifold 60 is threaded firmly around the threaded flange 70 of the opening 66 such that the lower edge of the manifold 60 is secured tight against the flange 70. The cooling tank 48 is then moved into the cabinet and positioned against a corner or back wall of the cabinet or other structure.

The air gap assembly 180 is installed on the lip of the sink 105 or countertop 208 depending on the sink configuration or other support surface. The air gap assembly 180 is designed to fit in the sprayer hole of standard sinks. If there is no sprayer hole or there is one but the user wishes to keep the sprayer, a hole may be drilled in the lip of the sink or countertop to accommodate the air gap assembly 180. The air gap assembly 180 is installed by first removing the decorative (friction-fit) chrome cover cap 198 by pulling straight upward.

The upper flange nut 202 and washer 210 is then removed from the riser 184 and while the lower flange nut 206 is left intact. From beneath the sink, the riser 184 is inserted into and up through the hole until the lower flange nut 206 abuts the underside of the sink deck or countertop. The rubber washer 210 is pushed down over the riser 184 while pulling up on the riser 184. The upper flange nut 202 is then threaded over and down the riser until the nut 202 has pushed the washer 210 into contact with the sink deck or countertop. The chrome cover cap 198 is fitted over the riser 184 until it locks into place to ensure that it fits properly. The chrome cover cap 198 is then removed. Then, while holding the riser still, tighten the lower flange nut 206 up against the underside of the sink deck or countertop to secure the assembly. Fit the chrome cover cap 198 over the riser 184 and lock into place again.

The drain adapter 256 may then be installed in a vertical or horizontal orientation in the sink drain piping as needed and at a position that is below the air gap assembly 180 and such that the water will not flow out of the lateral openings during normal the flow of water (no back flow). Preferably, the drain adapter 256 is installed at the lowest possible level in the system 40. To install the drain adapter 256, mark the center point of the area desired for installation, then cut a section of the existing drain tubing out to allow room for the slip joint tee 274. A slip joint compression nut 330 (FIG. 15) over each end of the tubing followed by one beveled washer 277. The beveled edge of the washer is facing the fitting as, for example, depicted in FIG. 15. The slip joint tee 274 is fitted into the open section and the nuts and washers are tightened securely to the threaded ends of the Tee. With the beveled washer 277 and compression nut 276 already in place and not yet tightened, the dual port drain adapter 256 is inserted into the inlet 273 of the slip joint tee 274 and pushed until its shoulder 279 is in contact with the nut 276. While tightening the compression nut 276, the drain adapter 256 is pushed towards the slip joint tee 274 until tight. The drain adapter 256 is then rotated so that the second inlet port 258 for the condensate line 96 is below the first inlet port 254 of the coolant overflow line 250. If the slip joint tee 274 is installed horizontally in the plumbing piping, the dual port adapter 256 should always be rotated to the 12:00 O'clock position so the first and second inlet ports 254, 258 are at the top and discharge downward into the slip joint tee 274. The lines are then connected to their respective elements (e.g. air gap assembly 180, in-line thermal valve assembly 284, flow control device 166, thermal valve assembly 112, manifold 60, coolant riser 244, cooling tank 48, and drain adapter 256) via their respective fittings.

To put the condensing system 40 in its operation mode, the shut off valve 108 is turned on. To test the condensing system 40, a small-bladed, standard screw drive or similar tool is inserted through the sight opening 146 in the side of the thermal actuator stem 134 and moved directly upward upon the poppet 110 to move the poppet upwardly to place the valve in the open position. Held in that position, water should begin flowing from the outlet 122 of the water valve 114, up through the line 162, 176, through the flow control device 166 and into the inlet 177 of the air gap assembly 180. Temporarily remove the chrome decorative cover cap 198 from the air gap assembly 180 by pulling upward. Water should be seen (via the gaps and openings) flowing very slowly into the air gap assembly 180. After a few moments, the water will have filled the chamber in the air gap assembly 180 and begin flowing from the outlet 236, downward to the coolant riser 244 in the cooling tank 48. Temporarily pull the coolant overflow line 250 out of the fitting 280 at the drain adapter 256 by pushing and holding in a collet around the perimeter while pulling outwardly on the overflow line 250. When a slow, intermittent flow of water is observed flowing from the coolant overflow line 250, push the line 250 back into the coolant overflow fitting and reassemble the decorative chromed cover cap 198 to the top of the air gap assembly 180. Remove the tool used to manually actuate the water coolant valve 114.

It should be noted that the system in any of the exemplary embodiments may be configured to be used for any type of thermal transfer of heat between a fluid in a heat exchange device and a fluid surrounding the heat exchange device. For example, the system may be set up to have a container filled with warm water to heat fluid in a heat exchange device. Also, instead of a condensing coil, other types of heat exchange devices that help to cool, condense, or heat up fluids may be used such as a heat sink. Also, a pressure relief device may be used instead of an air gap assembly. The pressure relief device may be an open pressure relief device. Also, various tubing sizes can be used for the coolant and other lines (e.g. ¼″, ⅜″, ½″, ¾″ outer diameter tubing).

It is noted that several examples have been provided for purposes of explanation. These examples are not to be construed as limiting the hereto-appended claims. Additionally, it may be recognized that the examples provided herein may be permutated while still falling under the scope of the claims.

Claims

1. A system for condensing steam comprising:

a cooling tank;

a condensing coil extending into the cooling tank;

a source of coolant in fluid communication with the cooling tank, wherein coolant from the source of coolant flows into the tank to cool the condensing coil when the temperature of the coolant in the cooling tank exceeds a predetermined value;

an air gap assembly located between the tank and the source of coolant, wherein the air gap assembly includes an opening to atmospheric air, wherein the air gap assembly is constructed and arranged to allow coolant to flow out of the opening when there is a predetermined amount of coolant back flowing into the device.

2. The system of claim 1 including a thermal actuator operatively connected to the cooling tank and a valve, wherein the valve is located between the source of coolant and the cooling tank, wherein the valve is operative to be in a closed position blocking the flow of coolant from the source of coolant into the cooling tank and an open position allowing the flow of coolant from the source of coolant into the cooling tank, wherein the thermal actuator causes the valve to be placed from the closed position to the open position in response to the temperature of the coolant in the cooling tank being above the predetermined value.

3. The system of claim 2 wherein the thermal actuator comprises an expandable part, wherein the expandable part is in contact with the coolant in the cooling tank and in operative connection with the valve, wherein the expandable part is operative to expand in response to the temperature of the coolant exceeding the predetermined value and cause the valve to be placed in the open position.

4. The system of claim 1 including a drain in fluid communication with the cooling tank, a condensate line fluidly connected between the drain and an outlet of the condensing coil, a coolant overflow line fluidly connected between the cooling tank and the drain, a steam line fluidly connected to an inlet of the condensing coil, a thermal actuator operatively connected in-line in one of the condensate line, the coolant overflow line, and the steam line, wherein the valve is located between the source of coolant and the cooling tank, wherein the valve is operative to be in a closed position blocking the flow of coolant from the source of coolant into the cooling tank and an open position allowing the flow of coolant from the source of coolant into the cooling tank, wherein the thermal actuator is operatively connected to the valve and causes the valve to be placed from the closed position to the open position in response to the temperature of a fluid in the one of the condensate line, coolant overflow line, and steam line exceeding a predetermined value.

5. The system of claim 2 wherein the thermal actuator includes an actuating part that is movable between an actuating position that causes the valve to be placed in the open position and a nonactuating position that allows the valve to be placed in the closed position, wherein the thermal actuator includes an opening for viewing the position of the actuating part.

6. The system of claim 2 including a drain in fluid communication with the cooling tank, a drain adaptor in operative connection with the drain, wherein the drain adaptor includes a first input port in fluid communication with condensate flowing from the condensing coil and a second input port in fluid communication with coolant flowing from the cooling tank.

7. The system of claim 6 wherein the drain adaptor is configured to be received by a slip joint tee.

8. The system of claim 1 including a drain in fluid communication with the cooling tank, wherein the drain is in fluid communication with an outlet of the condensing coil, a thermal valve assembly fluidly connected between the outlet of the condensing coil and the drain, wherein the thermal valve assembly is operative to prevent fluid from the condensing coil to flow into the drain in response to the temperature of the fluid exceeding a predetermined value.

9. The system of claim 8 including an indicator, wherein said indicator is operative to indicate that the fluid flowing out of the outlet of the condensing coil exceeds a predetermined temperature.

10. The system of claim 1 wherein the air gap assembly includes at least one barbed end, wherein the barbed end is securely received by a tubular adapter, wherein the tubular adapter is configured to be securely received by a fitting.

11. The system of claim 1 including a drain in fluid communication with the cooling tank, a manifold fitting operatively mounted to the tank, wherein the manifold includes first and second inlet ports and first and second outlet ports, wherein the first inlet port is in fluid communication with steam to be condensed and the first outlet port is in fluid communication with the condensing coil, wherein the second inlet port is in fluid communication with the condensing coil and the second outlet port is in fluid communication with the drain, wherein the manifold is configured such that steam to be condensed enters the first inlet port into the manifold and exits the manifold through the first outlet port and into the condensing coil, wherein the manifold is configured such that condensate from the condensing coil enters the second inlet port into the manifold and exits the manifold through the second outlet port to the drain.

12. The system of claim 1 including a drain in fluid communication with the cooling tank, wherein the cooling tank includes a coolant overflow outlet in fluid communication with the drain, wherein the coolant overflow outlet allows coolant to flow out of the cooling tank to the drain when the coolant in the cooling tank is at a predetermined level.

13. The system of claim 2 including a drain in fluid communication with the cooling tank, wherein the cooling tank is triangular in shape and includes a coolant inlet port for receiving coolant from the source of coolant, wherein the cooling tank includes a coolant overflow outlet in fluid communication with the drain, wherein the coolant overflow outlet allows coolant to flow out of the cooling tank to the drain when the coolant in the cooling tank is at a predetermined level, wherein the thermal actuator is positioned in the cooling tank between the coolant inlet port and coolant overflow outlet at a location in which temperature of the coolant is substantially at the average coolant temperature of the cooling tank.

14. The system of claim 2 including a drain in fluid communication with the cooling tank, wherein the drain is in fluid communication with an outlet of the condensing coil, a thermal valve assembly fluidly connected between the outlet of the condensing coil and the drain, wherein the thermal valve assembly is operative to prevent fluid from the condensing coil to flow into the drain in response to the temperature of the fluid exceeding a predetermined value.

15. The system of claim 1 including a flow control device operatively connected between the cooling tank and the source of coolant, wherein the flow control device is operative to control the flow of coolant into the tank at a predetermined rate.

16. The system of claim 2 wherein the thermal actuator includes a wax portion and a piston, wherein the wax portion is operatively connected to the piston, wherein the wax portion is operative to expand and move the piston a predetermined distance that causes the valve to be placed in the open position in response to the temperature of the coolant in the cooling tank increasing above a predetermined value.

17. The system of claim 6, including a drain in fluid communication with the cooling tank, wherein the first input port includes a first check valve and the second input port includes a second check valve, wherein the first check valve is operative to prevent the back flow of fluid from the drain to the condensing coil, wherein the second check valve is operative to prevent the back flow of fluid from the drain to the cooling tank.

18. The system of claim 17 wherein the check valve is a ball check valve.

19. A system for changing the temperature of a fluid comprising:

a container;

a thermal exchange device extending into the container;

a source of thermal exchange fluid in fluid communication with the container, wherein the thermal exchange fluid from the source of thermal exchange fluid flows into the container to change the temperature of the thermal exchange device when the temperature of the thermal exchange fluid in the container reaches a predetermined value;

a thermal actuator operatively connected to a valve, wherein the valve is located between the source of thermal exchange fluid and the container, wherein the valve is operative to be in a closed position blocking the flow of thermal exchange fluid from the source of thermal exchange fluid into the container and an open position allowing the flow of thermal exchange fluid from the source of thermal exchange fluid into the container, wherein the thermal actuator causes the valve to be placed from the closed position to the open position in response to the temperature of the thermal exchange fluid reaching the predetermined value.

20. The system of claim 19 wherein the thermal exchange device includes a condensing coil, wherein the container includes a cooling tank, wherein the thermal exchange fluid includes coolant, wherein the coolant from the source of thermal exchange fluid flows into the cooling tank to cool the condensing coil when the temperature of the coolant in the cooling tank exceeds the predetermined value.

21. The system of claim 20 wherein the thermal actuator comprises an expandable part, wherein the expandable part is in contact with the coolant in the cooling tank and in operative connection with the valve, wherein the expandable part is operative to expand in response to the temperature of the coolant in the coolant tank exceeding the predetermined value and cause the valve to be placed in the open position.

22. A system for condensing steam comprising:

a cooling tank;

a condensing coil extending into the cooling tank;

a drain in fluid communication with the cooling tank;

a condensate line fluidly connected between the drain and an outlet of the condensing coil;

a coolant overflow line fluidly connected between the cooling tank and the drain;

a steam line fluidly connected to an inlet of the condensing coil;

a source of coolant in fluid communication with the cooling tank;

a thermal actuator operatively connected to a valve, wherein the valve is located between the source of coolant and the cooling tank, wherein the valve is operative to be in a closed position blocking the flow of coolant from the source of coolant into the cooling tank and an open position allowing the flow of coolant from the source of coolant into the cooling tank, wherein the thermal actuator is operatively connected to one of the condensate line, coolant overflow line, and steam line, wherein the thermal actuator causes the valve to be placed from the closed position to the open position in response to the temperature of a fluid in the one of the condensate line, coolant overflow line, and steam line exceeding a predetermined value.

23. The system of claim 19 wherein the thermal actuator includes an actuating part that is movable between an actuating position that causes the valve to be placed in the open position and a nonactuating position that allows the valve to be placed in the closed position, wherein the thermal actuator includes an opening for viewing the position of the actuating part.

24. A system for changing the temperature of a fluid comprising:

a container;

a thermal exchange device extending into the container;

a source of thermal exchange fluid in fluid communication with the container, wherein the thermal exchange fluid from the source of thermal exchange fluid flows into the container to change the temperature of the thermal exchange device when the temperature of the thermal exchange fluid in the container reaches a predetermined value;

an air gap assembly located between the container and the source of thermal exchange fluid, wherein the air gap assembly includes an opening to atmospheric air, wherein the air gap assembly is constructed and arranged to allow thermal exchange fluid to flow out of the opening when there is a predetermined amount of thermal exchange fluid back flowing into the device.

25. The system of claim 24 wherein the thermal exchange fluid includes coolant, wherein the coolant from the source of thermal exchange fluid flows into the container to lower the temperature of the thermal exchange device when the temperature of the thermal exchange fluid in the container reaches a predetermined value.