Abstract: A double check valve is provided that includes an in-line inlet check valve and an outlet check valve that cooperate to prevent back flow of fluid through the valve. The check valve also includes at least one vent that allows for fluid trapped within the check valve to drain, thereby preventing freezing of the check valve and hydrant to which it is interconnected. The check valve provided omits many superfluous components and thus is smaller and easier to install than check valves of the prior art.

Abstract: An anti-freeze vacuum breaking structure for the faucet contains a tube body including a chamber, an inlet, an outlet, a connecting hole, and an intake valve; a control valve including a housing, a shaft bolt, a rod, a stopping sleeve, an upper ceramic piece, a lower ceramic piece, and a seat, the shaft bolt having a connecting segment and an actuating segment, a watering room, a through hole, the shaft bolt including an outflow orifice, the rod including an increased shoulder, the shoulder including a first stopping ring, the rod also including a decreased fitting section, the decreased filling section having a resilient element, an air channel, and an air bore, the rod including a second stopping ring; a handle including a rotating member coupling with a driving stem, the driving stem including one end with an aperture and another end fitted with the connecting segment.

Abstract: The apparatus and method of the invention provides for a rinse valve for controlling the flow of rinse fluid to a vacuum waste receptacle. The rinse valve comprises a primary rinse fluid flow path and a poppet assembly intersecting the primary rinse fluid flow path. The rinse valve also comprises a solenoid-driven fluid control device having a solenoid armature movable between an inactive state in which the armature engages the poppet assembly to block flow of the rinse fluid through a poppet channel and an active state in which the solenoid armature is disengaged from the poppet assembly to allow flow of the rinse fluid through the poppet channel to raise the poppet assembly, permitting the flow of the rinse fluid through the primary rinse fluid flow path and out of the valve, the armature being located at all times out of the primary flow path of the rinse fluid.

Abstract: An anti-inundation and drainage structure for an anti-freeze faucet contains a tube body, a controlling valve, and a control assembly. The tube body includes a chamber, an inlet, an outlet, and a coupling hole. The controlling valve is fixed in the chamber and includes a housing, an axial bolt, a first check device, a connector, a second check device, a ceramic shifting piece, a ceramic fixing piece, and a positioning member. The control assembly is coupled with the coupling hole and includes a rotating member connecting with a rod in the chamber of the tube body, the rod has a hollow passage defined therein and an air port formed on one end thereof so as to couple with the rotating member, another end of the rod relative to the air port is inserted into the second segment of the slot of the connector of the controlling valve.

Abstract: An anti-freeze vacuum breaking structure for the faucet contains a tube body including a chamber, an inlet, an outlet, a connecting hole, and an intake valve; a control valve including a housing, a shaft bolt, a rod, a stopping sleeve, an upper ceramic piece, a lower ceramic piece, and a seat, the shaft bolt having a connecting segment and an actuating segment, a watering room, a through hole, the shaft bolt including an outflow orifice, the rod including an increased shoulder, the shoulder including a first stopping ring, the rod also including a decreased fitting section, the decreased filling section having a resilient element, an air channel, and an air bore, the rod including a second stopping ring; a handle including a rotating member coupling with a driving stem, the driving stem including one end with an aperture and another end fitted with the connecting segment.

Abstract: The apparatus and method of the invention provides for a rinse valve for controlling the flow of rinse fluid to a vacuum waste receptacle. The rinse valve comprises a primary rinse fluid flow path and a poppet assembly intersecting the primary rinse fluid flow path. The rinse valve also comprises a solenoid-driven fluid control device having a solenoid armature movable between an inactive state in which the armature engages the poppet assembly to block flow of the rinse fluid through a poppet channel and an active state in which the solenoid armature is disengaged from the poppet assembly to allow flow of the rinse fluid through the poppet channel to raise the poppet assembly, permitting the flow of the rinse fluid through the primary rinse fluid flow path and out of the valve, the armature being located at all times out of the primary flow path of the rinse fluid.

Abstract: An eductor for mixing two liquids wherein the eductor includes a closed or non-air gap back flow prevention member. The vacuum profile of the eductor is altered by changing an opening in a passage portion to controllably divert water flow around the venturi tube or diverting the water without the opening. This affords the changing of the vacuum profile without redesigning the entire eductor.

Abstract: Disclosed herein is a switching valve for transmitting of fluids. In particular, disclosed herein is a switching valve for filling of gas tanks having a housing with an inlet area and an outlet portion. A check valve, a vent valve, and an inlet valve can be disposed within the housing. The vent valve and the inlet valve can be controlled by a slide that is coupled with a pivoting lever which is actuated by a control valve in a pressure controlled manner.

Abstract: A double valve is provided that includes an in-line inlet check valve and an outlet check valve that cooperate to prevent back flow of fluid through the valve. The check valve also includes at least one vent that allows for fluid trapped within the check valve to drain, thereby preventing freezing of the check valve and hydrant to which it is interconnected. The check valve provided omits many superfluous components and thus is smaller and easier to install than check valves of the prior art.

Abstract: An improvement for a backflow release valve of the type used for a backflow event in a supply line is provided. The improvement includes an air-liquid separator in fluid communication with the release valve and the supply line for reducing the amount of air entrained within a liquid solution entering the release valve, thereby reducing the total volume of liquid solution entering the release valve and minimizing the entrainment of water into air breaking a vacuum condition in the supply line.

Abstract: The object of the present invention is to provide a zone indicator and vacuum breaker combination. The zone indicator assembly includes a body having a funnel shaped interior providing a seal seat. A seal is provided upon a vacuum breaker flange of a shaft assembly. A lower end of the shaft assembly engages with a valve operating stem assembly of a rotating valve selecting disc. A zone indicator cap is assembled to an upper end of the shaft assembly. The cap adjusts vertically upon a body and cap interface disposed upon an upper end of the body.

Abstract: A siphon breaker includes a housing having a gas inlet and a gas outlet. The siphon breaker includes a stop valve adapted to transition from a closed position in which gas is substantially prevented from entering the gas inlet, and an open position in which gas is introduced into the gas inlet. The siphon breaker includes a control valve having a control valve gas inlet, a control valve gas outlet, and an electrically operated actuator. The control valve is adapted to transition from a closed position in which gas is substantially prevented from entering the control valve gas inlet, to an open position in which gas is through the control valve gas inlet.

Abstract: A double check valve is provided that includes an in-line inlet check valve and an outlet check valve that cooperate to prevent back flow of fluid through the valve. The check valve also includes at least one vent that allows for fluid trapped within the check valve to drain, thereby preventing freezing of the check valve and hydrant to which it is interconnected. The check valve provided omits many superfluous components and thus is smaller and easier to install than check valves of the prior art.

Abstract: An anti-back flow vacuum breaker valve includes a valve body having a cylindrical internal chamber with a conical upper portion and a reduced diameter lower portion forming a horizontal valve seat. The body has an inlet communicating with the chamber on the underside of the valve seat, and an outlet communicating with the chamber on the over side of the valve seat. A ball is positioned within the internal chamber having a diameter larger than the diameter of the valve seat for sealing the inlet of the valve. The valve body has a vertical journal vent extending through the conical upper portion of the chamber, and forms a vent seat at the lower end of the journal vent. The chamber has a buoyant vent plug having an upper stem slidably positioned within the journal vent and the vent plug is engagable with the vent seat. Upon flow through the inlet, the ball elevates the vent plug to seal the vent. Upon backflow through the outlet, the ball seals the inlet and the fluid elevates the vent plug to seal the vent.

Abstract: The present invention discloses a universal hole cutter in the field of mechanics, comprising an oil pump body, an oil cylinder and an oil storage chamber, in which the oil pump body could be fixedly connected with the oil storage chamber and the oil paths thereof could be communicated with each other. A pressure mechanism could be provided on the oil pump body for pressing the power oil within the oil storage chamber into the oil cylinder. The oil cylinder could be fixedly threaded with a pipe joint communicating with the internal cavity of the oil cylinder, and the pipe joint could be communicated with the oil pump body through a rigid movable linkage mechanism which could rotate the oil cylinder with respect to the oil pump body. Compared to the prior art, in the universal hole cutter thus described, the thread connection of the pipe joint and the oil cylinder is reliable and convenient.

Abstract: A double check valve is provided that includes an in-line inlet check valve and an outlet check valve that cooperate to prevent back flow of fluid through the valve. The check valve also includes at least one vent that allows for fluid trapped within the check valve to drain, thereby preventing freezing of the check valve and hydrant to which it is interconnected. The check valve provided omits many superfluous components and thus is smaller and easier to install than check valves of the prior art.

Abstract: A first check valve has a narrow flow path portion (68) formed between an arcuate portion (46) of the outer periphery (45) of a support member and a second enlarged-diameter portion (11) of a casing. The narrow flow path portion (first portion of an intermediate flow path) is in fluidic communication with a back-pressure chamber (50) defined in the support member at the rear of the top of a valving element through a communicating passage (67) including a gap (66) between the outer periphery of the valving element and the inner periphery of a large-diameter portion (38) and grooves (27) on the rear surface of the top of the valving element. Thus, a low static pressure of fluid flowing through the narrow flow path portion is introduced into the back-pressure chamber to move the valving element by a large differential pressure during the supply of fluid, thereby allowing the valve opening to become larger than in the conventional apparatus and enabling a reduction of pressure losses.

Abstract: An eductor for mixing two liquids wherein the eductor includes a closed or non-air gap back flow prevention member. The vacuum profile of the eductor is altered by changing an opening in a passage portion to controllably divert water flow around the venturi tube or diverting the water without the opening. This affords the changing of the vacuum profile without redesigning the entire eductor.

Abstract: The invention relates to an airing and venting valve for pipes and fittings carrying fluid, comprising a substantially cup-shaped valve body becoming smaller in cross-section towards the bottom for closing and opening a valve outlet, with a seal cup co-operating with a float of the valve, and a cup seal which is disposed between the valve body and seal cup and is able to move into different closing and opening positions lying across passage orifices of the valve body. By virtue of one aspect of the invention, the seal cup has an internal contour which becomes wider towards the top conforming to the external contour of the valve body. By virtue of another aspect, the valve body is disposed so that it is able to move against its seat at the valve outlet so that it can release and close a passage in the region of the valve body seat.

Abstract: A sillcock for supplying varying amounts of water at various temperatures includes a backpressure relief valve for relieving backpressure in the sillcock. The sillcock includes a sillcock tube and a valve body attached to the sillcock tube. A cartridge assembly is provided in the valve body, and an actuation assembly extends through the sillcock tube. The actuation assembly cooperates with the cartridge assembly to control the volume and temperature of water exiting the sillcock according to the axial and rotational movements of a knob. The backpressure relief valve includes a deformable member operable to allow water to be expelled from the sillcock if backpressure is present.

Abstract: An improvement for a backflow release valve of the type used for a backflow event in a supply line is provided. The improvement includes an air-liquid separator in fluid communication with the release valve and the supply line for reducing the amount of air entrained within a liquid solution entering the release valve, thereby reducing the total volume of liquid solution entering the release valve and minimizing the entrainment of water into air breaking a vacuum condition in the supply line.

Abstract: A check valve is provided comprising a conduit for conveying a fluid, the conduit having an inlet and an outlet, the conduit having a first region adjacent the outlet (13) comprising a flexible wall, two opposing sides of the flexible wall converging towards each other to form a closed geometry when the pressure of the fluid upstream of the inlet and the pressure of the fluid downstream of the outlet are substantially equal, the closed geometry comprising each of the opposing sides (23, 24) being arcuate in cross-section and lying against each other in a substantially sealing relationship (21, 22). Preferably, two connecting regions of the wall connecting the two opposing sides (15, 16) are biased towards each other by a biasing means. Preferably, the biasing means comprises one or more flexible ring members (25) encircling the flexible wall attached at points (25A and 25B). Preferably, the conduit takes the form of a duck beak valve (20). The figure shows an end view onto the check valve outlet.

Abstract: A freezeless hydrant includes an operating screw positioned within a head member, an operating coupling mating with the operating screw, an operating rod coupled to the operating coupling and a plug and a valve seat. Movement of the operating rod in one direction disengages the plug from the valve seat permitting water to flow through the casing and an opening of a set screw forcing a ball against an O-ring seal. Movement of the operating rod in an opposite direction causes alignment of a radial opening in the operating coupling with a passageway in the operating screw. The operating rod engages the valve seat preventing water from flowing through the casing and allowing the ball to fall away from the O-ring seal. Air enters a chamber of the operating screw thereby draining water from the chamber and out of the radial opening of the operating coupling.

Abstract: A system disconnector for physically disconnecting an upstream liquid system from a downstream liquid system by means of an outlet valve (35;135) depending on the pressure difference between the upstream and the downstream liquid system comprises an upstream backflow preventer (48; 148), a downstream backflow preventer (88), and an outlet valve body in the form of a piston (26; 126) arranged between the backflow preventers (48, 88). The pressure difference at the outlet valve body (26; 126) between the inlet pressure and the medium pressure between the backflow preventers counteracts a biasing spring (82; 182) acting in the opening direction of the outlet valve body. An actuating member (64; 164), which is exposed to the inlet pressure on one side and to the medium pressure on the other side is adapted to move between two stops (54, 46; 171, 146) against the power of a spring (86; 182) to compensate for small changes in inlet pressure and prevent dripping of the valve.

Abstract: An anti-siphon device for a flush valve having an air-inlet sealing diaphragm, a diaphragm bracket with an air inlet, a flex sleeve, a venting bracket, and an offsetting spring. The deformation power of the air-inlet sealing diaphragm is comparatively small. When compared with existing anti-siphon reflux devices, this anti-siphon device has a very low current pressure loss and can prevent leaking. When the anti-siphon device is applied in heating and plumbing devices, such as a flush valve, the current pressure can be retained and thus satisfactory flush effect is achieved.

Abstract: A system disconnector for disconnecting an upstream liquid system providing an inlet pressure from a downstream liquid system by a release valve (34) in response to a pressure drop between the systems, includes an upstream backflow preventer (40), a downstream backflow preventer (64) and a release valve body piston (18) arranged between the backflow preventers (40, 64). A pressure difference between the inlet pressure and a middle pressure between the backflow preventers (40,64) counteracts a spring (60) biasing the release valve body in the opening direction, the release valve body (18) having an effective pressurized surface (d) smaller than the surface effective for the inlet pressure. A hollow space (74) defined by the release valve body is connected to the middle pressure (66). A shiftable seat (76) provided in hollow space (74), is movable with respect to the release valve body to a fixed stop (84) upstream of the valve seat (32).

Abstract: A valve assembly for preventing backflow and siphoning in a plumbing line, the valve assembly comprising a valve body including a first end having a first aperture for receiving liquid from a supply source, a second end having an exit port for releasing liquid to a demand source, and a second aperture for receiving air. The assembly further includes a variable thickness diaphragm located within a valve chamber having a first and a second portion, the first portion for influencing the flow of liquid in the first aperture and the second portion for influencing the flow of air in the second aperture, the second portion having a flex line for enhancing the amount of flexing provided by the second portion. The first portion further includes a protuberance for enhancing the strength of the diaphragm during low vacuum sealing conditions.

Abstract: A backwater valve assembly includes a valve housing, a valve member and a servicing tool. The valve housing has an internal ledge within its interior on which is positioned a retainer clip oriented in vertical alignment with a riser. The valve member has a first engagement of a two part engagement on one face and a mounting along a peripheral edge which includes transverse pins adapted to engage the retainer clip. The servicing tool includes a second engagement of the two part engagement at a working end of a shaft. The hook engages the hook receiver of the valve member during insertion and removal.

Abstract: A water flushing system for a pressurized subterranean water distribution system includes an inlet conduit for receiving pressurized water from the subterranean water distribution system; an outlet fluidly connected to the inlet conduit for discharging pressurized water in the inlet conduit downwardly towards a drain; and a control valve for controlling the flow of pressurized water in the inlet conduit. The water flushing system further includes one or more of the following features: a freeze protection assembly, a detachable coupling system, a dechlorination system, and a backflow prevention system.

Abstract: A siphon breaker includes a housing having a gas inlet and a gas outlet. The siphon breaker includes a stop valve adapted to transition from a closed position in which gas is substantially prevented from entering the gas inlet, and an open position in which gas is introduced into the gas inlet. The siphon breaker includes a control valve having a control valve gas inlet, a control valve gas outlet, and an electrically operated actuator. The control valve is adapted to transition from a closed position in which gas is substantially prevented from entering the control valve gas inlet, to an open position in which gas is through the control valve gas inlet.

Abstract: A freeze safe valve includes a housing coupled between an upstream tube and a downstream tube of a water flowing or supplying line for shutting off the water flowing or supplying line and for opening a drain port in response to the formation of ice on the downstream side of water flowing or supplying line, and thus for alleviating the pressure on the downstream side and for precluding or eliminating water damage from frozen, broken pipes, etc. A flexible valve member is disposed in the housing for selectively blocking the drain port of the housing by the fluid flowing into the housing and for selectively blocking the an orifice of a plate by a spring member.

Abstract: The invention relates to an airing and venting valve for pipes and fittings carrying fluid, comprising a substantially cup-shaped valve body becoming smaller in cross-section towards the bottom for closing and opening a valve outlet, with a seal cup co-operating with a float of the valve, and a cup seal which is disposed between the valve body and seal cup and is able to move into different closing and opening positions lying across passage orifices of the valve body. By virtue of one aspect of the invention, the seal cup has an internal contour which becomes wider towards the top conforming to the external contour of the valve body. By virtue of another aspect, the valve body is disposed so that it is able to move against its seat at the valve outlet so that it can release and close a passage in the region of the valve body seat.

Abstract: A freezeless hydrant includes an operating screw positioned within a head member, an operating coupling mating with the operating screw, an operating rod coupled to the operating coupling and a plug and a valve seat. Movement of the operating rod in one direction disengages the plug from the valve seat permitting water to flow through the casing and an opening of a set screw forcing a ball against an O-ring seal. Movement of the operating rod in an opposite direction causes alignment of a radial opening in the operating coupling with a passageway in the operating screw. The operating rod engages the valve seat preventing water from flowing through the casing and allowing the ball to fall away from the O-ring seal. Air enters a chamber of the operating screw thereby draining water from the chamber and out of the radial opening of the operating coupling.

Abstract: In a valve, the combination comprising a valve chamber, having a flow inlet and a flow outlet, a valve operator outside the chamber, a stopper in the chamber and operatively connected with the operator for movement toward and away from seat structure in the chamber, to control flow from the valve via the outlet, and the seat structure including first and second seats, the stopper located to seat on the first seat. there being a flexible sealing lip carried by the stopper to sealingly engage the second seat when the stopper sets on the first seat. Relatively movable parts define said operative connection, with configuration and relative movement to allow air inflow to break back siphonage of liquid, and to allow back pressure relief via drain passages.

Abstract: A system disconnector (10) for physically disconnecting an upstream liquid system from a downstream liquid system by means of an outlet valve (48) provided in a housing (16), the disconnecting being effected depending on the pressure drop between the upstream and the downstream liquid system, and wherein the housing (16) is provided with a bore (28) and an opening (26) in alignment with said bore (28), said opening adapted to be closed, includes a pressure reducer (66, 36) in the form of a cartridge provided in said bore (28), which is adapted to be removed in one piece from the housing (16). The system disconnector (10) is provided with an upstream backflow preventer (40), a downstream backflow preventer (42), and an outlet valve body in the form of a piston (44) biased by a spring, said outlet valve body disposed between said backflow preventers, wherein the pressure reducer cartridge (34, 36), the backflow preventers (40, 42), and the outlet valve body (44) are disposed in alignment inside the bore (28).

Abstract: A toilet refill restrictor apparatus includes an adapter interposed between a fill valve and a refill hose. The adapter is non-removably coupled to the fill valve and is configured with a larger proximal pathway, and a smaller distal metering pathway for restricting the refill flow rate. The adapter may be coupled to a shortened horizontal outlet formed at a top portion of the fill valve. The horizontal outlet is shortened to a length such that the refill hose cannot be connected directly to the outlet. The adapter may also be coupled to a fill valve without a horizontal outlet where an exit port is defined in the vertical conduit of the fill valve. The adapter includes a securing mechanism to prevent removal from the fill valve without excessive force or breaking the adapter.

Abstract: A vacuum breaker having a housing with an inlet for connection with the wall hydrant, an outlet for connection with the hose, and a central cavity. A drain valve is disposed within the housing between the central cavity and the inlet to permit drainage of fluid from the hydrant to the outlet end of the housing when the hose is not connected thereto. A first check valve is disposed within the housing between the central cavity and the inlet to control flow between the inlet and central cavity. A second check valve is disposed within the housing between the central cavity and the outlet to control flow between the central cavity and the outlet, and the first and second check valves have an arcuate sealing surface.

Abstract: A valve assembly for preventing backflow and siphoning in a plumbing line, the valve assembly comprising a valve body including a first end having a first aperture for receiving liquid from a supply source, a second end having an exit port for releasing liquid to a demand source, and a second aperture for receiving air. The assembly further includes a variable thickness diaphragm located within a valve chamber having a first and a second portion, the first portion for influencing the flow of liquid in the first aperture and the second portion for influencing the flow of air in the second aperture, the second portion having a flex line for enhancing the amount of flexing provided by the second portion. The first portion further includes a protuberance for enhancing the strength of the diaphragm during low vacuum sealing conditions.

Abstract: A single-piece manifold comprising a body having an inlet in communication with a water supply and an outlet that communicates with a sprinkler system having a main conduit adapted for fluid flow between the inlet and the outlet is disclosed. The body includes a main valve that provides a means of manually shutting off communication with the water supply and first and second check valves positioned across the main conduit for preventing fluid flow therethrough until the sprinkler system is activated. The single-piece manifold has a reduced pressure arrangement comprising a valve member that vents water that may build up between the first and second check valves in order to prevent the back flow of contaminated water from the sprinkler system to the water supply.

Abstract: The invention comprises, in one form thereof, a sprayer apparatus that includes a disengageable pressurized fluid source, a pressure chamber in fluid communication with the fluid source, a backflow valve, a sealed vessel, and a sprayer outlet. The backflow valve has two one-way valves separated by a weep mechanism and is positioned between the fluid source and the pressure chamber such that the two one-way valves allow fluid flow from the fluid source to the pressure chamber. The sealed vessel is in fluid communication with the pressure chamber. The sprayer outlet includes a shutoff valve in fluid communication with the pressure chamber. The shutoff valve normally prevents fluid flow from the pressure chamber to the sprayer outlet and is operable to allow fluid flow from the pressure tank to the sprayer outlet.

Abstract: A water hydrant having a housing with inlet and outlet ends, and a valve assembly having a valve seat and a valve closure element. A valve operating rod is secured to the valve closure element to open and close the inlet end. A backflow preventor check valve mounted within the housing provides for fluid flow only in the downstream direction toward the outlet end. In one embodiment, the backflow preventor and valve closure element are formed of a unitary body; likewise, the valve seat and housing are formed of a unitary body. In another embodiment, an extension body is associated with the valve operating rod and the backflow preventor is attached to the extension body upstream from the valve seat. In a further embodiment, the backflow preventor is secured to the housing upstream from the valve seat, and is adapted to remain in a fixed position when the inlet valve is adjusted.

Abstract: A water flushing system for a pressurized subterranean water distribution system includes an inlet conduit for receiving pressurized water from the subterranean water distribution system; an outlet fluidly connected to the inlet conduit for discharging pressurized water in the inlet conduit downwardly towards a drain; and a control valve for controlling the flow of pressurized water in the inlet conduit. The water flushing system further includes one or more of the following features: a freeze protection assembly, a detachable coupling system, a dechlorination system, and a backflow prevention system.

Abstract: The invention relates to a valve assembly of a pipe disconnector for separating a service water system which is arranged to be filled or re-filled from a drinking water system, comprising upstream and downstream backflow preventers which both close in the direction from the service water system to the drinking water system, and a relief valve, which is exposed to the pressure of the drinking water system in closing direction and which is adapted to connect the space between the backflow preventers to a drain, when this pressure ceases. A pipe disconnector is to be provided, which is easy to clean and to service. Furthermore, a valve assembly is to be provided which can be used equally for pipe disconnectors of the type CA and for pipe disconnectors of the type BA.

Abstract: A back flow preventer is provided that is made of at least two different materials. The back flow preventer includes a housing that has a passageway configured for the transport of a fluid therethrough. The housing has both an inlet and an outlet that define at least a portion of the passageway. The inlet is made of a different material than the outlet. A first and second check valve are disposed in the passageway. Both of the check valves allow fluid to flow through the passageway in the direction from the inlet to the outlet of the housing.

Abstract: A line pressure diverter for placement between a rupture line and a rupture disc associated with a reactor. The line pressure diverter comprising a first passage, a second passage, a vacuum breaker and a check valve. The first passage being positioned to be in fluid communication with the rupture line at a first end and with a rupture disc at a second end. The second passage being positioned to be in fluid communication with the first passage and positioned at an angle relative to the first passage. The vacuum breaker being positioned so as to extend through and into the second passage. The check valve being positioned to be in fluid communication with the second passage, the check valve being rated at a rating below that of a rupture disc.

Abstract: A dual hydrant includes two spaced apart tubular bodies to receive in-flow of fluids A and B, a fluid mixing zone to receive fluids A and B from the bodies, manually operable flow control valves in the two tubular bodies, primary and secondary check valves in the respective bodies to pass forward fluid flow toward the mixing zone, and to block reverse flow, an outlet from the mixing zone.

Abstract: An improved relief valve for use in a diaphragm flush valve is constructed having a sealing member provided with an exteriorly threaded shaft extending down into the diaphragm flush valve with a smaller diameter metal stem extending from the bottom of the shaft, a tube member having a passageway formed by the interior surface wall of the tube member, the interior surface wall having an upper threaded portion to permit the tube member to be screwed to the shaft, and a sleeve member slidable along the metal stem with the sleeve member upper end positioned in the tube member passageway and retained in the passageway by a stop forming part of the tube member.

Abstract: A sanitary fitting block constructed for concealed fitting contains water pipes for hot and cold water and also for mixed water. Between a mixer cartridge to be connected to the sanitary fitting block and a switching means for a shower outflow is provided a return flow preventer and between the switching means and the bath outflow is provided a vent.

Abstract: A modular diverter valve with integral atmospheric type vacuum breaker has a housing and a replaceable rotatable cartridge is provided. The housing having a cartridge receiving chamber being surrounded by an internal housing wall. The housing also has an inlet port and laterally directed outlet ports. Each outlet port directs water for selective uses. The rotatable cartridge includes all working parts including a handle engaging portion, an inlet and an outlet for selective alignment with the housing ports. The cartridge has a hollow interior having an inlet tube in communication with the inlet of the cartridge and including a vented hollow space above the inlet tube, and including a float assembly to the vent the cartridge to the atmosphere. The float assembly has a resilient seal for sealing the open end of the inlet tube and a check valve to prevent siphoning to the inlet port.

Abstract: A backflow prevention system that helps prevent contamination of potable water distribution systems from backflow at fire hydrant connections.