Abstract: A valve apparatus for medical applications, comprises a flexible member extending across a lumen through which a flow of materials is to be controlled. The flexible member includes a plurality of movable elements formed on opposite sides of a slit extending through the flexible member. The moveable members are biased so that when a pressure less than a predetermined threshold value is applied to the flexible member, the moveable elements are maintained in a closed position in which no flow is permitted past the flexible member and, when a pressure at least as great as the threshold value is applied to the flexible member, the moveable elements are moved to an open position separated from one another along the slit permitting flow through the lumen.

Abstract: Nonreturn valve, in particular for medical uses, with a first tube connection housing and a second tube connection housing and, arranged between the two tube connection housings, a diaphragm disc which is made of flexible material and which can be lifted from an annular valve seat when there is an overpressure in an inlet channel and can be pressed onto the valve seat when there is an overpressure in an outlet channel. At its outer peripheral area, the diaphragm disc is provided with an annular bead which is received in mutually opposite annular grooves of the tube connection housings. The diaphragm disc is provided, radially outside the valve seat, with openings leading to an outlet chamber, and the wall of the second tube connection housing lying opposite the openings is provided with recesses which communicate with the outlet channel, are separated from each other by supporting surfaces for the diaphragm disc and are connected to the outlet channel by narrow deep grooves.

Abstract: A refueling valve assembly is a pressure-activated valve that allows a flow of fluid, for example, fluid fuel, into the fuel reservoir. A fuel inlet port allows for the fluid fuel to be introduced into the valve assembly. The valve assembly includes a compressible member having a first sealing position and a second fueling position, where the compressible member is more compressed in the second fueling position than the first sealing position. The compressible member is sealingly coupled with the fuel inlet port when the compressible member is in the first sealing position.

Abstract: A check valve for one-way flow of a fluid comprises a valve body defining at least two pairs of axially-extending sidewalls, each pair of sidewalls having a pair of resilient lips defining slit opening at the outlet end of the valve. In one embodiment of the invention, the valve body defines three pairs of sidewalls and corresponding lips which are arranged one another so as to provide the check valve with an “I-beam” cross-sectional shape. The I-beam check valve has a compact cross-section, making it suitable for mounting either inside or outside a pipe. The I-beam shape provides support along the valve axis so that the valve does not require any supplemental support structure. In another embodiment, the valve body may define two pairs of sidewalls having a “T-shaped” transverse cross section.

Abstract: A pneumatic lift including inflatable mattresses stacked one atop another and arranged in air flow communication with one another, but with each being independently deflatable.

Abstract: The present invention presents various novel approaches to solving the problems inherent in measuring biological pressures in high pressure systems. Thus, to protect a pressure transducer exposed to fluid flows at higher pressures than its overpressure rating, a novel valve is used that closes a protected leg in which the transducer is located. The various exemplary embodiments of such valves each have a high pressure input, one or more low pressure inputs, and an output. In operation, when a high pressure fluid flow occurs at a high pressure input, such valves automatically close the low pressure inputs. Alternatively, a novel transducer system is presented, which automatically limits the effective pressure sensed by a transducer to a certain maximum.

Abstract: In one embodiment, the valve comprises: (a) a housing configured to interengage with a container, and having at least one axis and at least one aperture; (b) a first poppet axially movably within said housing between a first closed position and a first open position; (c) a second poppet axially movable within said first poppet between a second closed position and a second open position; (d) a first seal between said first poppet and said housing; (e) a second seal between said first poppet and said second poppet; (f) a first resilient member disposed within a first space between said housing and said first poppet, and having a resilient force sufficient to hold said first poppet in said first closed position such that said first poppet urges said first seal against said housing when a pressure differential axially across said first poppet is below a first point, and to allow said first poppet to move in said first direction to said first open position when said fluid pressure differential exceeds said first p

Abstract: A pressure relief valve for relieving air pressure from an automotive vehicle interior. The pressure relief valve mounts on a valve mounting location that surrounds a body opening and includes flexible interleaved flaps and a securing mechanism. The flaps cover the body opening, with each of the flaps being generally triangular in shape and having an outer end adjacent to the valve mounting location and a pair of sides extending from the outer end inward to an inner corner, with the inner corners meeting to form a peak. The interleaved flaps form a generally pyramidal-shape that angles away from the automotive vehicle interior as the interleaved flaps extend inward from the outer ends toward the peak. The securing mechanism is secured to the radially outer ends of the flaps and to the valve mounting location.

Abstract: The invention relates to a casting machine (1) for casting a flowable mass (M), in particular a flowable mass with suspended solid particles. Said casting machine comprises a mass container (2) for receiving the flowable mass and at least one valve (32, 42; 50; 60; 70; 80; 90; 100; 110; 120) that is fluidically connected to the inner area of the mass container. When the pressure changes in the direction of the valve along the valve passage, said valve is in the open state and in the absence of a pressure change in the direction of the valve passage, said valve is in the closed state. The casting machine also comprises pressure generating means (3, 4, 5, 6, 32, 42) for generating a change in the pressure in the direction of the valve passage.

Abstract: A pressure control valve assembly, (i.e. pressure regulator valve assembly) is described which is configured for at least a two stage operation including: a first stage in which flow is allowed through two sections of the valve frame; and, a second stage in which the valve member is biased against one of the sections of the valve frame and not the second section. Specific example features and configurations are depicted and described. A crankcase ventilation filter assembly including the pressure control valve assembly is described.

Abstract: A water saving device and method of using same disclosed in the present invention, wherein the water saving device comprising a sleeve (2) and an elastomer (1) fixed in said sleeve (2), said elastomer (1) having at least a permanently-open hole (13), a throttling hole (14) and a protrusion (12) for arranging said permanently-open hole (13) and/or throttling hole (14); said permanently-open hole (13) is a hole which still maintain open status after being distorted by pressure, said throttling hole (14) is a hole which will be closed approximately after distortion by pressure. The water saving device not only has the function of decreasing the flow, but also can adjust the flow of the shower and faucet to make the flow steady.

Abstract: An apparatus for failsafe control of liquid material passage through a line is provided. The apparatus includes a dispensing control unit for coupling to the line, which includes a housing having an inlet, an outlet, and a conduction port extending therebetween for selectively passing the liquid material received from the line therethrough. A control port is disposed in the housing to direct a flow path of at least a portion of a pressurized fluid stream received thereby. A response valve portion also disposed in the housing is reconfigurable between first and second states responsive to the pressurized fluid stream directed thereto, such that in the first state it seals the conduction port against passage of the liquid material, and in the second state opens the conduction port for passage of the liquid material. The response valve portion is resiliently biased to the first state.

Abstract: A gas release device that includes a reservoir of pressurised gas and a passageway from said reservoir to an outlet. There is an elastic gas permeable membrane in the passageway that allows gas release only via the membrane. A gas impermeable member is provided in the passageway that includes an interface positioned to contact said gas permeable membrane. Displacement of the gas permeable membrane is responsive to the pressure of the gas in the reservoir such that there is a greater interfacial contact between the gas impermeable member and the gas permeable membrane at a higher gas pressure than at lower pressure to thereby vary the exposed cross sectional area of the permeable membrane available to the flow in an inverse relationship to pressure.

Abstract: A spray gun reservoir has an oversize central opening 130 at one end allowing liquid to be added to the reservoir for fast filling with reduced risk of spillage. A cap member 132 is connectable to the reservoir and has a spout 115 providing a fluid outlet of reduced size relative to the opening 130 for connection to the spray gun. The reservoir can be disconnected from the cap member 132 when it is desired to add liquid to the reservoir. In this way, the reservoir can be re-filled in use.

Abstract: A hydraulic control valve for controlling pressurizing medium flows, which has a hydraulically unlockable cheek valve that includes a closing element by which a valve opening can be closed. The closing element is equipped with at least one through-hole such that a locking part that is spring-loaded via at least one flexible tongue is formed for locking the valve opening.

Abstract: An air-bag (1) is provided with a vent aperture (2). A membrane (3) extends across the vent aperture, the membrane defining a smaller aperture (4) than the vent aperture (2). The periphery of the aperture is defined by a thickened part of the membrane. The membrane is formed of an elastic material such as a silicone rubber material. When a very high pressure exists in the air-bag the vent becomes deformed, thus increasing the size of the aperture defined by the membrane, permitting a relatively large flow of air from the air-bag to reduce the pressure within the air-bag.

Abstract: A microfabricated fluidic unidirectional valve includes a microfabricated elastomer material having a flow through channel. The microfabricated fluidic unidirectional valve also includes an elastomer flap attached to the elastomer material in the flow through channel. The elastomer flap forms a seal in the flow through channel to prevent fluid from flowing in a first direction through the flow through channel and to allow fluid flow in a second direction through the flow through channel.

Abstract: A check valve comprising two valve films 11, 12 of synthetic resin that put one on the other, having an air passage 2 defined by two seal sections 21, 22 formed by means of bonding parts of the valve films together and a compression bag and air compression bag equipped with this check valve, wherein the inlet 2a of the air passage 2 is defined by the straight line linking the respective upward flow side end sections 21a, 221a of the seal sections 21, 22; the outlet 2b of the air passage is defined by the straight line linking the respective downward flow side end sections 21b, 223b of the seal sections 21, 22; and in at least one of the seal sections 21, 22, the valve films 11, 12 are not bonded together at the line of extension 21c, 223c of the seal section 21, 22, situated on the downward flow side of the downward flow side end section 21b, 223b of the seal section 21, 22.

Abstract: A valve (20) and flow control element (22) are provided for use with a dunnage bag (24). The valve (20) includes a valve housing (40) that carries an actuator (36) and the flow control element (22). The housing (40) defines a flow passage (44), and a seal surface (48) around the flow passage. The flow control element (22) includes a peripheral attachment portion (60), a resilient, intermediate portion (62) extending generally laterally inwardly from the peripheral attachment portion and defining at least one flow aperture (64); and an imperforate central portion (68) extending generally laterally inwardly from the intermediate portion and including a seal (70) for sealing against the housing seal surface with the flow control element in a normally closed position.

Abstract: This passive one-way valve is used in a connection portion between first and second flow channels, and includes: an inlet portion into which a fluid from the first flow channel flows; an elastic portion for blocking the inlet portion; a rigid portion for supporting the elastic portion from a side opposite to the inlet portion across the elastic portion; a gap portion formed around the rigid portion; and an outlet portion which is in communication with the gap portion for letting the fluid flow out into the second flow channel. Furthermore, the inlet portion is hermetically sealed by the elastic portion being pressed against the inlet portion side by the rigid portion. According to this passive one-way valve, it is possible to provide a simple and inexpensive passive one-way valve without requiring special equipment such as a vacuum pump and pressurized air, and to provide a microfluidic device using the same.

Abstract: An irrigation system having at least one water distribution member, a water supply source and a horizontally oriented, shut-off control device located in a fluid flow line between a water supply source and the at least one water distribution member for automatically shutting off the flow of supply water to the at least one water distribution member in response to a predetermined increase in force of fluid flow. The shut-off control device has a housing with an interior flow path having rails and projections dimensioned to support a compressible ball which moves within the housing and limits side-to-side motion or turbulence.

Abstract: A valve system includes a gas generator coupled to a first chamber and a passage for conveying a flow of fluid therethrough. The first chamber is configured to hold a gas generated by the gas generator. The chamber includes a diaphragm deformable in response to an increase in an amount of the gas in the first chamber received by the gas generator. A deformation of the diaphragm in response to the increase in the amount of the gas in the first chamber inhibits flow of the fluid through the passage.

Abstract: A check valve and method for manufacture of the check valve. The check valve comprises a substrate and a channel in the substrate. The channel has an anchor region, a channel corridor and a valve seat region. There is an elastomeric valve mechanism in the channel. The valve mechanism has an anchor portion anchored in the anchor region, an elastomeric web portion in the channel corridor and a valve plug in the valve seat region. The elastomeric web portion interconnects the anchor portion and the valve plug. The elastomeric web portion is in a stretched state such that the valve plug is forced by the elastomeric web portion against the valve seat region to seal the valve seat region. The force of the elastomeric web portion can be overcome by operative fluid pressure within the channel to separate the valve plug from the valve seat region and thereby open the channel at the valve seat region to allow the fluid to exit the channel via the valve seat region.

Abstract: A closure assembly for a container includes a closure cap having an open ended body with a peripheral wall and a top wall provided with a dispensing passage which is defined by a collar arranged to the top wall. A self closing valve is arranged in the closure cap. The valve includes a slit central portion and a skirt extending downwardly from the central portion, which has an outwardly extending flange. The skirt is arranged in the collar and the flange is located below the collar and extends radially outwardly beyond it. On a lower surface of the top wall, a plurality of lips is formed outward from the collar. The lips are folded over the flange such that the latter is partly enveloped between the lips and the top wall so as to secure the valve in the closure cap.

Abstract: A check valve is provided, including a first hose connector housing defining an entry passage extending into an entry space at least partially defined by an annular valve seat, a second hose connector housing coupled with the first hose connector housing and defining an exit passage, and a generally flexible perforated membrane disk positioned between the first and second hose connector housings such that the membrane disk selectively engages the valve seat.

Abstract: Provided is a small, simple-structured, homogeneous and mass-producible excessive pressure release valve which works even at a relatively low excessive pressure to surely and safely release the pressure to the external world. The excessive pressure release valve has an elastic rubber plate and a reversibly openable slit that passes through the upper and the lower surfaces and release the pressure to the external world when the internal excessive pressure stressing on the lower side surface, pushes and opens the slit toward upper surface side. The elastic rubber plate is made of silicone rubber containing 1-20% by mass of silicone oil.

Abstract: The invention relates to a container (1), in particular for aerosols, with a container body (2) which comprises an expulsion opening (4) and a discharge opening (6), an expulsion valve (8) which is provided in the expulsion opening (4), and a discharge device (10) which is provided in the discharge opening (6). The container according to the invention is characterized in that the discharge device (10) comprises a first (12) and a second (14) element, wherein at least the second element (14) has at least one through-opening (16), and wherein, by displacing and/or rotating the second element (14) in relation to the first element (12) and/or the container body (2), the through-opening (16) can be brought into a discharge position in which the through-opening (16) connects the interior of the container body (2) to the outside of the container body.

Abstract: At least one exemplary embodiment is directed to an earpiece comprising: an ambient sound microphone (ASM); an ear canal microphone (ECM); an ear canal receiver (ECR); and an inflatable sealing section, where the sealing section includes at least one pressure valve, where the at least one pressure valve opens when the pressure in the sealing section is greater than an ambient pressure.

Abstract: The present invention creates a new rigid degassing valve. The valve of the present invention utilizes a relatively stiff support body in order to successfully vent gases, such as carbon dioxide, from within the packaging. Carbon dioxide may be created by organic products placed in the packaging which causes the package to expand. The valve of the current invention maintains its shape as the package becomes bloated and takes on a rounded shape due to carbon dioxide expended by the roasted coffee beans.

Abstract: The present invention presents various novel approaches to solving the problems inherent in measuring biological pressures in high pressure systems. Thus, to protect a pressure transducer exposed to fluid flows at higher pressures than its overpressure rating, a novel valve is used that closes a protected leg in which the transducer is located. The various exemplary embodiments of such valves each have a high pressure input, one or more low pressure inputs, and an output. In operation, when a high pressure fluid flow occurs at a high pressure input, such valves automatically close the low pressure inputs. Alternatively, a novel transducer system is presented, which automatically limits the effective pressure sensed by a transducer to a certain maximum.

Abstract: Overmolding of softer materials onto ends of rigid plastic pipes is detailed. The pipes typically are components of automatic swimming pool cleaners and connect to valves made of softer, flexible material. Because of the overmolding, flexing of the valves during operation of the cleaners does not cause significant wear of the valves in the regions where they connect to the pipes.

Abstract: Space vehicles such as space stations are often constructed as segmented inflatable structures which are susceptible to being punctured by small meteoric materials, resulting in small insidious leaks which are difficult to locate and repair. A method and apparatus are described in which a differential pressure transducer is positioned between segments of the space vehicle. Atmospheric gas pressure of all segments is continuously monitored. Analysis is performed on any pressure differentials which are determined to exist between adjacent segments. Detection of small leaks initiates an automatic isolation of the leaking segment. Detection of catastrophic leaks initiates an emergency evacuation of personnel from the affected segment.

Abstract: In an air enclosure and a check valve capable of being filled with high pressure air, two first inner films are installed between two outer films, and two second inner films are then stacked together between the two first inner film. The two outer films and the two first inner films are adhered together by means of hot sealing to allow the two first inner films to be positioned between the two outer films and an air cylinder to be formed between the two outer films; the two second inner films are adhered to each other by means of hot sealing to form a second air inlet between the two second inner films. Thereafter, an air filling tool may be used to force high pressure air into the second air inlet and into the air cylinder, causing the air cylinder to fill with air and expand.

Abstract: A valve includes a stem, a cap, and a deformable lip. The stem includes a first sealing portion and has a longitudinal axis. The cap is connected to the stem and includes a passageway. The deformable lip extends from a periphery of the cap and includes a second sealing portion. The stem is displaceable relative to the deformable lip along the longitudinal axis of the stem to open the first sealing portion and close the second sealing portion to allow fluid to move through the passageway in the cap.

Abstract: A check valve for a fluid administration system. A connector includes a housing, and first and second conduits defined by the housing, wherein the first conduit is in fluid communication with the second conduit. A check valve is disposed within the housing and includes a first body portion defining a first passageway for fluid flow, and a second body portion defining a second passageway for fluid flow. The first and second passageways are in fluid communication with one another and the second body portion is movable relative to the first body portion between first and a second positions. When the second body portion is in the first position, fluid flow may occur in a first direction, but not in a second direction substantially opposite to the first direction. When the second body portion is in the second position, fluid flow may occur in the second direction.

Abstract: A one-way valve apparatus for use in draining fluid from a patient comprises a housing having an inlet end, an outlet end and a valve-receiving chamber therebetween. A valve is positioned in the chamber. The valve has an inlet end, an outlet end and a fluid pathway extending therebetween. The valve is made up of first and second generally flat elongated members joined along respective longitudinal edges. The valve inlet end is engaged with the housing inlet end to comprise an open end for receiving fluid to be drained. The valve outlet end is in a normally closed position. The valve is adapted to partially open to permit drainage of fluid received through the pathway, and to return to the normally closed position upon drainage of the fluid. The valve outlet end communicates with the housing outlet end such that the drained fluid passes from the valve outlet end through the housing outlet end.

Abstract: A low-profile one-way valve assembly that attaches to a liquid conduit. A valve fitting supports a recessed, bi-leaflet, elastomer valve piece. A compound curvature at a valve base, raised seal forming surfaces at provided leaflets, tapered extension surfaces at the leaflets and a tailored sidewall thickness profile at the leaflets assures a durable watertight sealing action at the flexible valve piece. An O'ring mounted to a threaded fitting surface seals the assembly relative to a supporting conduit. A cover is also provided to protect the valve piece from external damage and significant back pressures.

Abstract: There are provided a pressure control valve which has sealing characteristics and durability, functions also as a temperature-dependent cutoff valve, and can be reduced in size; a method of producing the pressure control valve; and a fuel cell system having the pressure control valve mounted thereon. The pressure control valve includes a movable part which operates by a differential pressure, a valve part, and a transmission mechanism for transmitting an action of the movable part to the valve part, wherein either one of the movable part and the valve part is separated from the transmission mechanism.

Abstract: The object of this invention is to provide a hydraulic control valve for drip hoses, which controls a flow of water according to a water pressure, thus keeping a pressure of Water fed to a drip hose constant. The hydraulic control valve includes a hose connector (110) clamped at opposite ends thereof to a branch hose (H/S) and a drip hose (H/N), a water supply path having a larger-diameter path (120a) and a smaller-diameter path (120b), a U-shaped flexible cup (200), and a support ring (300). The Larger-diameter path includes a stepped seat (142) having projections (141) and depressions (142). The smaller-diameter path includes an inward projecting step (150). The cup is placed at an end thereof to be near to the inward projecting step, and includes a flange (210). The support ring (300) is fitted into the larger-diameter path to prevent a removal of the cup.

Abstract: A pump (60, 160) has a pair of working members (preferably diaphragms 1, 2, 101, 102) and a pump chamber (3, 4, 103, 104) associated with each working member is communicated via check valves (32-35, 132-135) to a suction manifold (30, 130) and to an outlet manifold (31, 131). A drive mechanism (10, 110) couples the working members so that they reciprocate together and a first of the working members performs an outlet stroke while a second of the working members performs a suction stroke. The suction and outlet manifolds (30, 130, 31, 131) are incorporated in a manifold assembly that connects the pair of diaphragms (1, 2, 101, 102) for coordinated reciprocation. A pair of manually-operated levers (J, 8, 107, 108) are connected together for opposite reciprocation and are drivingly connected to the working members (1, 2, 101, 102).

Abstract: A flow valve having sealing member having a first condition for engaging a housing to prevent back flow and a platform for obstructing a flow passage through the flow valve with the platform supporting the sealing member in an out-of-the-way condition to allow fluid to flow through the flow valve.

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: A cassette integrated system. The cassette integrated system includes a mixing cassette, a balancing cassette, a middle cassette fluidly connected to the mixing cassette and the balancing cassette and at least one pod. The mixing cassette is fluidly connected to the middle cassette by at least one fluid line and the middle cassette is fluidly connected to the balancing cassette by at least one fluid line. The at least one pod is connected to at least two of the cassettes wherein the pod is located in an area between the cassettes.

Abstract: A one-way valve which can be utilized in a toilet, particularly in a urinal, to prevent return flow of malodorous gases from the sewage system into the room wherein the toilet is installed has a body which is confined in the toilet. The body carries two sheet- or panel-shaped valving elements at least one of which is resilient to yield to the flow of urine but normally sealingly engages the other element to prevent the flow of gases from the sewage system counter to the direction of flow of the urine. At least one marginal portion of the at least one valving element is free to move away from the corresponding marginal portion of the other element to also permit lateral outflow of urine when the one element is at least partially out of contact with the other element.

Abstract: An apparatus for preparing a beverage suitable for consumption such as coffee on the basis of a hot liquid such as water provided with a storage tank, a heater and a three-way valve. The three-way valve is provided with in inlet, a first outlet and a second outlet. The pump is in fluid communication with the storage tank and an inlet of the heater. There is a fluid communication between the outlet of the heater and the inlet of the three-way valve, between the first outlet and the storage tank and/or an inlet of the pump and between the second outlet and a beverage preparing unit for preparing the beverage suitable for consumption on the basis of the hot liquid.

Abstract: A check valve for medical infusion lines and the like, includes a diaphragm made of elastic material set between a first tubular connector and a second tubular connector. The diaphram includes an end wall of a cup-shaped element, having an outer peripheral edge of which is normally pressed in seal contact against an annular valve seat with a conical surface of the first tubular connector under an axial thrust exerted by a side wall of the cup-shaped element. A free edge of the side wall of the cup-shaped element is set resting against a transverse surface of the second tubular connector only in regions corresponding to angular portions of the latter separated by non-resting angular portions.

Abstract: A simple, external in-line valve for use in microfluidic devices constructed of elastomer such as polydimethylsiloxane (PDMS) is described. The actuation of the valve is based on the principle that flexible polymer walls of a liquid channel can be pressed together by the aid of a permanent magnet and a small metal bar. In the presence of a small NdFeB magnet lying below the channel of interest, the metal bar is pulled downward simultaneously pushing the thin layer of PDMS down thereby closing the channel stopping any flow of fluid. The operation of the valve is dependent on the thickness of the PDMS layer, the height of the channel, the gap between the chip and the magnet and the strength of the magnet. The microfluidic channels are completely closed to fluid flows commonly used in microfluidic applications. The valve allows for fabrication of a “thin chip” that allows for detection of chromophoric species within the microchannel via an external fiber optics detection system.

Abstract: The present invention presents various novel approaches to solving the problems inherent in measuring biological pressures in high pressure systems. Thus, to protect a pressure transducer exposed to fluid flows at higher pressures than its overpressure rating, a novel valve is used that closes a protected leg in which the transducer is located. The various exemplary embodiments of such valves each have a high pressure input, one or more low pressure inputs, and an output. In operation, when a high pressure fluid flow occurs at a high pressure input, such valves automatically close the low pressure inputs. Alternatively, a novel transducer system is presented, which automatically limits the effective pressure sensed by a transducer to a certain maximum.

Abstract: A high pressure storage and delivery system having a fail-safe vacuum actuated valve is provided. In particular, through the innovative design of the vacuum actuated check valve, the system can accommodate up to three times the volume of product in similar size cylinders.

Abstract: A drain valve having a temperature responsive member that holds the drain valve in a water conserving mode when water is above freezing yet allows the drain valve to drain when the water is near freezing to prevent freeze damage to the irrigation system.