Abstract: A valve for a heat exchanger includes a base configured to be positioned adjacent to an inlet end of a heat exchanger, a heating element positioned on the base, and a flap connected to the base that is movable between an open position and a closed position. The open position permits the flow of fluid into the inlet end of the heat exchanger and the closed position blocks the flow of fluid into the inlet end. The flap is made from a heat responsive material.

Abstract: In accordance with various embodiments, a plug head assembly is provided comprising a ceramic plug head having a frustroconical geometry, wherein the ceramic plug head has a proximal terminus and a distal terminus, wherein the ceramic plug head has a first coefficient of thermal expansion (CTE), a sleeve having a frustroconical geometry conforming to the ceramic plug head and a second CTE, wherein the second CTE is greater than the first CTE, a distal retainer having a frustroconical geometry conforming to the sleeve, the distal retainer having a first engagement portion for engaging the a proximal retainer, the proximal retainer having a second engagement portion for engaging the distal retainer, and a base that couples with the proximal retainer. In addition, thick banded plug heads are provided.

Abstract: A washing machine of the present invention comprises a casing; a tub disposed inside the casing; a drum rotatably provided inside the tub, for accommodating laundry therein; and a gasket interposed between the casing and the tub, for preventing water in the tub from leaking between the tub and the casing. Wherein the gasket comprises a plurality of gasket nozzles for spraying water into the drum; and a plurality of connectors for supplying water to the respective gasket nozzles. Wherein the gasket nozzle comprises a spray guidance surface for refracting the an advancing direction of the water supplied through the connector so as to spray the water toward inside of the drum; and a plurality of protrusions provided adjacent to an finish end of the spray guidance surface on which the water guided along the spray guidance surface is separated, and arranged along an width direction of the spray guidance surface.

Abstract: An apparatus for preventing backflow and contamination, and detecting by-pass leaks in a flow control arrangement is disclosed. The apparatus includes a vent line connecting a sweep gas source and a vent. Constant process-inert gas flows from the source through the vent line into the vent. The vent line is connected with the flow control arrangement. Any leakage in the flow control arrangement is channeled to the vent line and swept into the vent along with the sweep gas. As a result, pressure in the flow control arrangement cannot build up and leakage backflow is prevented. A flow switch may be disposed on the vent line for detecting leakage. The sweep gas flow rate is controlled at a constant level that is inadequate to actuate the flow switch and keeps the flow switch ready to actuate by any superimposed leakage. The flow switch detects a leakage when it actuates.

Abstract: A washing machine includes a cabinet; a tub which is disposed in the cabinet and in which washing water is stored; a drain hose that guides the washing water in the tub toward an outer side of the cabinet; and a siphonage prevention unit disposed on the drain hose, wherein the siphonage prevention unit includes: a connection pipe having a connection flow path that communicates with the drain hose; an air pipe having an air flow path that communicates with the connection flow path; and a protrusion that is disposed adjacent to a communication portion in which the connection flow path and the air flow path communicate with each other and that protrudes from an inner side surface of the connection pipe. Through this configuration, a siphonage phenomenon in the drain hose can be prevented.

Abstract: The present application relates to an anti-siphon valve for a tank including a body with an inlet, an outlet, and a passage for the fluid, the passage connecting the inlet to the outlet. The anti-siphon valve further includes a movable cut-off device interacting with a seat to close the passage. The cut-off device normally remains in the closed position and is designed to open the passage in the presence of a positive pressure difference between the inlet and the outlet. The anti-siphon valve further includes an auxiliary control mechanism for the cut-off device towards the passage opening, the control mechanism being designed to act on the cut-off device only to open the passage, so as to enable the cut-off device to move under the effect of pressure at the outlet independently of the mechanism.

Abstract: An anti-siphon installation assembly includes a spring, a retainer clip mounted on the spring, the retainer clip including a support surface adapted to support an anti-siphon device thereon, and a locator clip mounted on the spring, the locator clip including an outwardly extending arm adapted to contact the upper surface of a fuel filler neck opening.

Abstract: An anti-siphoning fuel system that includes a fuel inlet, a fuel tank, at least one fill tube or hose connecting the fuel inlet to the fuel tank such that fuel may flow from the fuel inlet to the fuel tank, and an anti-siphoning element or device coupled to the fill tube or hose that may be installed in existing boats or cars and obstructs a siphoning hose inserted in to the fill tube or hose from entering the fuel tank.

Abstract: A device that stores a low molecular gas, such as hydrogen (H2), under high pressure includes having an inner shell and at least one outer sleeve surrounding the inner shell. The region between the inner shell and the outer sleeve is connected via at least one valve with a backflow prevention capability to the region surrounded by the inner shell. The valve is thereby formed so that low molecular gas which has diffused through the inner shell can flow back into the inner shell when there are suitable pressure conditions.

Abstract: A fan assembly for a computer system includes a fan and a frame connected to the fan. A number of louvers are rotatably connected to the frame and are capable of rotating between an open position in response to air pressure established by the fan in which air is permitted to flow through the fan, and a closed position under a force of gravity when the fan is inoperable in which the louvers block the air to flow through the fan. Each louver defines at least one groove along a width direction, and each of the at least one groove allows two portions at opposite sides to be broken off from each other.

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 backflow-prevention system that substantially prevents contaminant backflow at a treatment site. The system includes a fluid ejector tube for insertion into the patient's mouth and a backflow prevention device that receives fluid from the fluid ejector tube. The backflow prevention device includes an internally positioned valve member. The valve member limits contaminant backflow. The valve member is movable between open and closed positions based on a vacuum pressure condition in the system.

Abstract: An anti siphon device, comprises a generally tubular body (1) having a longitudinal axis X; an outlet (18). The anti siphon device comprises an inlet; the inlet having an opening adapted to receive a fuel dispensing nozzle (19) the end of which has an outside diameter D, the inlet having a constriction (11a) spaced from said opening along said axis X and having a diameter d less than D. The anti siphon device additionally comprises an obstruction (3), at least a major portion of which is located between the constriction (11a) and the outlet (18). The obstruction (3) tapers outwardly relative to the axis X in a direction from the constriction (11a) to the outlet (18). There is provided a flow passageway (17) extending from the constriction (11a) to the outlet (18) and defined between the obstruction (3) and a wall surface (10b) at least substantially surrounding the obstruction (3), the flow passageway (17) having a minimum width less than the diameter d of the constriction (11a).

Abstract: A marine fuel backflow preventer and overfill alarm for use with marine vessels includes a housing provided for in-line installation in the fuel fill inlet line and directs fuel entering the a fuel filling inlet generally directly to a fuel filling outlet such that the fuel passes freely through the back flow preventer while being directed to the vessel fuel tank. The housing further functions as a reservoir for containing fuel which has accumulated therein due to over-filling and/or that has been carried into the housing via the fuel tank vent line. By providing a fuel containing reservoir disposed in-line the present invention thus functions to prevent unintended fuel spillage into the environment. The back flow preventer further includes an electro-mechanical float switch that automatically activates an alarm upon sensing the presence of fuel within the housing.

Abstract: A valve comprises a valve cartridge, a valve stem and a valve seal. The valve cartridge comprises a generally cylindrical cartridge body, a bore extending longitudinally through the cartridge body, and an outlet passage and intermittent inlet passages extending through a side wall of the cartridge body to intersect the bore. The valve stem comprises an elongate body configured to slide within the bore, and a neck and a seal channel circumscribing the elongate body. The valve seal is seated within the seal channel. The valve stem slides within the bore to move the seal channel past the inlet passages. Portions of the cartridge body between the inlet passages retain the valve seal within the valve channel until the inlet passages are open to the neck. In one embodiment, the inlet passages form a crenelated edge. In another embodiment, the inlet passages form a ported end.

Abstract: According to example embodiments, a dishwasher may include a siphon break apparatus configured to substantially prevent a siphon effect in a fluid conduit configured to drain a fluid from the dishwasher. The siphon break apparatus may include a first check valve in fluid communication with the fluid conduit and exposed to a pressure therein and a second check valve in fluid communication with the first check valve. The first and second check valves may be configured to be substantially closed when pressure in the fluid conduit increases as a result of fluid being pumped through the fluid conduit and substantially open when pressure in the fluid conduit decreases as a result of the fluid no longer being pumped through the fluid conduit. Thereby the siphon effect may be substantially prevented.

Abstract: A backflow prevention device includes at least one backflow prevention unit. The backflow prevention unit includes a frame, a first edge shutter plate, a second edge shutter plate and plural intermediate shutter plates. The frame includes an airflow channel. If the first inner sidewall is disposed over the second inner sidewall, the first edge shutter plate and the plural intermediate shutter plates are configured to open or close the airflow channel, and the slab of the second edge shutter plate is inactive. Whereas, if the second inner sidewall is disposed over the first inner sidewall, the second edge shutter plate and the plural intermediate shutter plates are configured to open or close the airflow channel, and the slab of the first edge shutter plate is inactive.

Abstract: A device for delivering a fluid to a target site is disclosed in one embodiment of the invention as including a pump, a flow modulator, a flow meter, and a controller. The pump may generate a fluid stream characterized by a flow rate. The flow modulator may smooth out irregularities in the flow rate, thereby generating a second fluid stream having a second flow rate that is substantially more uniform than the first flow rate. The flow meter may measure the flow rate of the second fluid stream. The controller may then compare the flow rate of the second fluid stream to a target flow rate, and adjust the pump speed to substantially align the second flow rate with the target flow rate.

Abstract: A washing machine having a water supply unit provided with a branch pipe. The washing machine includes a main body, a tub provided within the main body, a water supply hose connected to a water supply source to supply water to the tub, the water supply unit including channels defined by at least one inlet and at least one outlet and at least one structure discriminated from the channels, at least one of the at least one inlet and the at least one outlet being connected to the water supply hose, and a branch pipe provided on the water supply unit to allow a portion of water introduced into the water supply unit to branch off and be discharged to the outside of the water supply unit.

Abstract: An apparatus for preventing backflow of a fill valve in a water toilet. The apparatus includes a fill valve for permitting and stopping supply of washing water from a hydrant into a water tank, a fixing section fixing the fill valve to an overflow pipe, a float having a packing for opening or closing an opening/closing hole of the fill valve depending on a level of water contained in the water tank, and a backflow-preventing section disposed inside the fill valve. The backflow-preventing section permits washing water to be supplied from the hydrant into the water tank, and prevents washing water from flowing back toward the hydrant. The backflow-preventing section includes a backflow-preventing member mounted to a supply pipe of the fill valve, and an operation control valve seated on a fitting protrusion of the fill valve to control an operation of the backflow-preventing member.

Abstract: An oral feeding system using anti-drip visual positioning markers and a unidirectional, anti-vacuum valve to simultaneously and rapidly eliminate the hydrostatic pressure and vacuum build-up, respectively, normally occurring in conventional feeding bottles. In one version, the anti-drip visual positioning markers and valve are part of the same bottle (standard or ergonomically-shaped). In another version, a nipple is held by a nipple crown that screws onto an adaptor with anti-drip visual positioning markers and a hole into which the anti-vacuum valve is inserted. The adaptor screws onto a standard or ergonomically designed feeding bottle. The anti-vacuum valve can have one or more extended tabs that make it easier to grip when removing the valve. The use of an ergonomically shaped, hard-wall bottle optimizes caregivers' comfort and minimize potential hand and/or wrist injury. Transparent materials can be used for the components of the system.

Abstract: A washing machine with a single input hose for both hot and cold water. The solenoid-operated water mixing valve assembly has a direct attachment to the hot and cold water supply valves. A flexible hose connects the washing machine to the solenoid-operated water mixing valve assembly. When the washing machine fill cycle begins, the solenoid-operated water mixing valve assembly is turned on and the water is output to the flexible hose. When the washing machine fill cycle ends, the water supply is turned off. The hot and cold water are mixed prior to input to the flexible hose, and as a result, only one flexible hose is required to supply water to the washing machine. The flexible hose is attached to the output of the solenoid-operated water mixing valve assembly and therefore is not under water pressure unless the washing machine is in a fill cycle.

Abstract: An automatically activated backflow prevention device for water closets or toilets is provided having a substantially cylindrical support member terminating in one end in a cam shaped end for mating with a hinged flapper valve having a parabolic shaped or upwardly curving upper surface and correspondingly shaped sealing member disposed therebetween for mating with the cam shaped end of the substantially cylindrical support member. An elastomeric hinge member is provided for connecting the closure member or flapper valve to the substantially cylindrical support member so that when closed the flapper valve or closure member conforms to the confronting cam shaped end of the cylindrical support member with the sealing member disposed therebetween. A backflow water pressure responsive assist member is optionally provided on the lower surface of the closure member to assist in the closure of the closure member in response to backflow water pressure from waste pipes.

Abstract: A drain valve that prevents entry of odious airborne particulates into the habited environment while allowing for drainage of wastewater. The improvements include a disc with leaves cantilevered from a perimeter lip allowing the valve to operate in a drain with limited clearance between the opening and the drain crosshair below, a structural brace that effectively seals the center of the drain while allowing for through-passage of the drain strainer bolt, a gap at the perimeter edge of each leaf to prevent interference with an opposing edge, and rounded leaf edges and rounded vertices to prevent snagging of hair follicles and other draining matter. Also disclosed is a combined drain strainer and drain valve, and a drain valve installable within a drain pipe beneath the drain opening.

Abstract: A valve assembly including a body having a first end, a second end, a passageway extending between the first and the second ends, and four ports defined by the body and connected to the passageway. The assembly also has a first valve member received in the passageway at an intersection of the passageway and the first port, the valve member including a tee shaped passage such that in a first position the valve member opens the passageway and the first port, in a second position closes the passageway and connects the first end to the first port, in a third position closes the passageway and connects the first port to the second end, and in a fourth position opens the passageway and closes the first port. The assembly also includes a second valve member for opening and closing the third port.

Abstract: An anti-siphon installation assembly includes a spring, a retainer clip mounted on the spring, the retainer clip including a support surface adapted to support an anti-siphon device thereon, and a locator clip mounted on the spring, the locator clip including an outwardly extending arm adapted to contact the upper surface of a fuel filler neck opening.

Abstract: An in-line, hose-end filter/flow regulator/anti-siphon device is disclosed. The disclosed hose-end device includes a unitary body having a generally linear side profile, a first end, a second end, and a longitudinal axis. An inlet hose-end receptor is disposed on the first end, while an outlet hose-end receptor is disposed on the second end. An anti-siphon section, a filter section, and a flow regulator section are positioned between the first end and the second end. The inlet hose-end receptor, the anti-siphon section, the filter section, the flow regulator section, and the outlet hose-end receptor are coaxial with the longitudinal axis of the body.

Abstract: A sanitary installation part (1) which has an installation housing (2) which can be inserted into a housing mount of a gas line or a liquid line is provided and has at least one latching element which projects into a latching position on the outer circumference of the housing and can be moved in a resiliently elastic manner from this latching position to a zero position. The installation part according to the invention provides that the at least one latching element is designed as a latching protuberance (5) which is beveled or rounded along its transverse edges oriented transversely to the insertion direction on both sides, and the at least one latching protuberance (5), in its zero position, can be can be resiliently fitted into the latching element mount, in which the latching protuberance (5) is incorporated in the outer circumference of the installation housing (2).

Abstract: A suction limiting device with variable control for use in a surgical system includes a main vent body having a fluid carrying bore extending therethrough and a variable vent mechanism having a main vent opening in selective fluid communication with the fluid carrying bore so as to permit introduction of atmospheric air into the fluid carrying bore. The vent mechanism being adjustable so that the degree of airflow into the fluid carrying bore is variable between a fully open position to a fully closed position where atmospheric air is prevented from entering the fluid carrying bore. The suction limiting device also includes a valve disposed within the main vent body and positionable between an open position when negative pressure and a closed position when positive pressure exists in the main vent body.

Abstract: A trouble-shooting shut-off valve includes an inlet-tail-tube mountable directly into a compression-fitting outlet socket of a defective shut-off valve, thus positioning the trouble-shooting valve immediately downstream from the defective valve in line in series with the defective valve. An inlet-tail-tube fitting is mounted onto an upstream end of the valve housing as a component of the valve. This fitting has an axial bore forming an upstream extension of an inlet passage in the valve housing. The inlet-tail-tube projects axially from this fitting adapted for insertion directly into such a socket in the defective valve. The inlet-tail-tube has a diameter equal to the outside diameter of flexible plumbing tubing, referred to as flex tube, and is formed of material suitable for making a compression connection thereto. An inlet end termination of the inlet-tail-tube is flat for seating down squarely into the outlet socket of the defective valve.

Abstract: An improved float to prevent over-filling of a dishwashing machine including a cylindrical main float body, a skirt attached to the main float body and extending outwardly and downwardly therefrom, and a float stem. The main float body includes a lower portion which extends downwardly beyond a lower terminal portion of the skirt, and serves as a suds stop to prevent suds created during operation of the dishwasher from rising up within the hollow interior of the main float body and flowing down a stand pipe upon which the float is mounted. The lower portion of the main float body includes a slotted opening which serves as a vacuum breaker to prevent a vacuum from being created within the main float body which would cause the float to adhere to bottom wall of the dishwasher tub.

Abstract: The present invention relates to a back-flow prevention device for use with a water supply for supplying water to dental instruments within a dental clinic for preventing bacteria contamination of a water source feeding water supply. The device provides no mechanical connection between the water source and the water supply.

Abstract: An instant coupling comprises a male element (9) and a female element (1) which comprises a chamber (4) containing a valve (5) provided with a first sealing surface (10) which, when pressurized water is present, rests against a seat (12) and shuts-off water delivery when the male element (9) is not inserted, and a second sealing surface (11) below the first and arranged to rest against a respective seat (13) under the action of any momentary negative pressure arising in the water feed hose, in order to prevent undesirable fluids being drawn in when the male element is inserted.

Abstract: A choke valve apparatus is accommodated to different conditions of fluid flow (to or from a well, for example) by providing multiple flow control packages each having two flow control units, each package being readily connectible in the same valve body.

Abstract: The pump has a pumping chamber with a deflectable diaphragm member and fluid inlet and outlet passages. A deflectable valve flap is disposed across the fluid inlet passage and another flexible valve flap is disposed across the fluid outlet passage. Movement of the flexible valve flaps is responsive to movement of the flexible diaphragm member, reciprocation of which establishes alternate sequential suction and discharge conditions. An air chamber provided in the pump receives outside air through an air vent opening and also communicates with the pump discharge passage through a bleed hole when the outlet passage is closed by the outlet valve flap. The outlet valve flap is also deflectable to a position where it closes the bleed hole. Under this arrangement, continuous siphoning of fluid through the pump after the pump has been shut down is obviated.

Abstract: This invention is directed to a plumbing fixture to lessen and to prevent the flow of a liquid, from a source of liquid, flowing to an apparatus such as a washing machine or a dishwasher. More, particularly, this plumbing fixture is directed to lessening the flow of a liquid from a laundry tub to a washing machine or a dishwasher by a syphoning effect. The liquid in the laundry tub is not allowed to flow to the washing machine or a dishwasher by a syphoning action.

Abstract: Steam cleaning equipment comprising a water reservoir incorporating steam and water inlet ports and steam and water outlet ports arranged to supply steam at a controlled pressure and water in predetermined quantities to a hand piece where they are mixed in a venturi nozzle.A steam pressure reducing valve in the reservoir is immersed in the water and operated by steam pressure on a piston which has no sealing rings but which condenses steam leaking past the piston and passes the condensate into the reservoir.Detergent metering means and anti-siphon provisions are also described.

Abstract: In a wall hydrant, on the inner and outer ends of a wall-penetrating conduit, an inlet connection casting and a discharge casting; a valving member movable axially in an inlet valving bore relative to a seat; a lateral conduit outlet from a discharge casting bore; a shaft structure including key-rotated stem threaded through a plug in the latter bore end and connected axially to shift, upon rotation, the valving member, and also a shaft-carried flange "O"-ring sealable on an interior surface controlling plug-associated exterior draining and air vent openings; the valving and flange seals being spaced, relative to the controlling surface and inlet bore spacing, for conduit drainage and vent opening after inlet closure; a part of the shaft structure upon removal being invertable to serve as a valve seat service tool. Within the hydrant, an anti water backup device.

Abstract: A backflow prevention assembly designed for connection between a main supply line and a service pipe in water supply service, comprising two check valves in series and a relief valve for draining the chamber between the two check valves under certain operating conditions.

Abstract: A backflow prevention assembly designed for connection between a main supply line and a service pipe in water supply service, comprising two check valves in series and a relief valve for draining the chamber between the two check valves under certain operating conditions.

Abstract: A backflow prevention assembly designed for connection between a main supply line and a service pipe in water supply service, comprising two check valves in series and a relief valve for draining the chamber between the two check valves under certain operating conditions.

Abstract: A ballcock assembly in which a sheath extends upwardly through the fluid within a reservoir tank to support a valve mechanism above the normal level to which fluid will rise in the reservoir tank. An inlet tube which connects a fluid supply line to the valve mechanism extends through the sheath and is wholly isolated from the fluid within the reservoir tank by the sheath. The outermost lateral dimension of the inlet tube and the innermost lateral dimension of the sheath are such that the inlet tube is completely circumscribed by an air space comprising a passageway that extends the full axial extent of the inlet tube between its effective connection to the valve mechanism and its effective connection to a fluid supply line. The passageway is required to communicate with atmosphere at a level beneath the fluid in the reservoir tank and may also communicate with atmosphere at a level above the normal level to which fluid will rise within the reservoir tank.