Abstract: Apparatus for delaying initiation of a successive flush cycle in a plumbing system utilizing a diaphragm flush valve having an improved relief valve assembly and/or an improved vacuum breaker assembly structured to delay after initiation of an initial flushing cycle the resetting of the relief valve sleeve member in a position for a successive operative contact by the flush valve plunger pin.

Abstract: A cartridge for a valve housing having outlets, the cartridge comprising a stationary body sleeve for fixed insertion within the housing and having outlet ports permanently aligned with the outlets of the housing, a moveable substantially hollow stem sleeve inserted within the stationary body sleeve and having an opening selectively alignable with the ports of the stationary body sleeve, the body sleeve and hollow stem being connected to one another by a retaining ring which aligns and maintains the cartridge as a unit in the housing. The diverting valve may be installed as a deck mounted fixture in a tub, whirlpool, soaking bath, spa, roman tub, or the like wherein the tub spout is located below the flood line rim of the respective fixture wherein the diverting valve can be repaired by replacing the cartridge from the top of the valve by removing the handle and replacing the cartridge in its entirety.

Abstract: The instant invention is directed to a left ventricle valve for use in a left ventricle drain line. The left ventricle valve includes a unidirectional check valve having duckbill valve portion and a flange portion to movably cover vacuum vent openings. The vacuum vent openings are parallel to the flow passage of the left ventricle valve. The valve also has a pressure relief opening. The invention further contemplates the valve in an extracorporeal circuit for draining the left ventricle of a heart.

Abstract: An adjustable height fill valve for controlling the water level in a storage tank for a toilet includes a riser mounted in the tank and connected to a pressurized water supply. The riser includes an anti-siphon body telescopically mounted over a fixed shank. The anti-siphon body telescopically adjusts between retracted and extended positions. A pilot valve is mounted on the anti-siphon body in fluid communication with the water supply. A float is mounted in association with the pilot valve to selectively open or close the pilot valve depending on the water level in the tank. A latch on the anti-siphon body and a series of stops on the shank are releasably engageable to adjustably fix the position of the body on the shank between the retracted and extended positions. The stops comprise first and second sets of axially spaced and interleaved fingers which define a serpentine track into which the latch extends.

Abstract: A riser-type bidet valve includes a diverter body, a diverter collar threaded onto the diverter body, a valve actuator mounted for axial reciprocal travel concentric with the diverter body and diverter collar, a valve mounted on the valve actuator at the base thereof for travel between a diverter body lower outlet valve seat and an upper outlet valve seat whereby actuation of the valve actuator selectively opens and closes the lower and upper valve seats, an atmospheric vacuum breaker valve mounted for slidable travel on the valve actuator concentric with the diverter collar at the upper end thereof, a closure cap threaded into the upper end of the diverter collar, the closure cap having a valve seat, and a spring for urging the atmospheric vacuum breaker valve upwardly against the closure cap valve seat and for permitting the atmospheric vacuum breaker valve to open upon creation of a negative pressure within the bidet valve to permit ingress of atmospheric air.

Abstract: A cartridge valve 116 includes a fixed disk 80 and a movable disk 118 mounted in a housing 66. A lever 46 extends through a major opening 72 axially located at one end of the valve 116. The lever 46 is attached to a coupler 130 for facilitating movement of the movable disk 118 relative to the fixed disk 80 to control the flow and temperature of water passing through the valve 116. A flexible valve 144 is attached to the coupler 130 and, in normal use of the valve 116, prevents holes 136 formed therethrough from communicating with a passage formed through the movable disk 118. Air from the environment surrounding the valve 116 can enter the major opening 72, and upon the occurrence of a negative pressure in the water supply, will flex the valve 144 to allow air to enter the supply line to negate the undesirable effects thereof. In another cartridge valve 160, holes 166 are formed through the side wall of the housing 66 to provide further air communication through the holes 136 of the coupler 130.

Abstract: A cartridge for a valve housing having outlets, the cartridge comprising a stationary body sleeve for fixed insertion within the housing and having outlet ports permanently aligned with the outlets of the housing, a moveable substantially hollow stem sleeve inserted within the stationary body sleeve and having an opening selectively alignable with the ports of the stationary body sleeve, the body sleeve and hollow stem being connected to one another by a retaining ring which aligns and maintains the cartridge as a unit in the housing. The diverting valve may be installed as a deck mounted fixture in a tub, whirlpool, soaking bath, spa, roman tub, or the like wherein the tub spout is located below the flood line rim of the respective fixture wherein the diverting valve can be repaired by replacing the cartridge from the top of the valve by removing the handle and replacing the cartridge in its entirety.

Abstract: A fill valve has a main valve with a valving surface contacted by a valve disk. A series of offset radial paths separated by a toroidal path permit free radial flow at full open and quiet tortuous flow as the valve closes. Removal of a cap permits access to the main valve for cleaning. Indicia in the valve body provide easy height adjustments. A riser base is made up of easily molded locking parts and provides a variable height adjustment structure that is shielded from view. A flexible cup performs multiple functions including serving as a pilot valve, a vacuum breaker valve and a seal. A float for operating the pilot valve is pivotally mounted without extra parts or fasteners.

Abstract: The invention relates to a filling fitting for filling a closed hot-water heating system, the filling fitting comprising a tube separator including an upstream backflow preventer, a downstream backflow preventer and a drain valve controlled by the inlet pressure and arranged, with regard to the flow, between said two backflow preventers, and a pressure reducer. This construction allows the downstream pressure reducer to be used in two manners, on one hand in connection with the tube separator and, on the other hand, in order to allow the pressure reducer to be removed. By dividing the filling fitting into two fitting portions, of which the second one only comprises the pressure reducer and the downstream backflow preventer, the second fitting portion can also be used alone without tube separator, when the safety requirements are less strict.

Abstract: A backflow preventer assembly installed between a supply line and a service line, comprising one or more check valves and a high pressure relief valve operating to discharge water in the service line under a high pressure condition.

Abstract: A valve has a housing formed with a connection face, an intake port adapted to be connected to a supply of pressurized liquid, an output port, an intake passage extending from the intake port to the connection face, a bore extending from the connection face, an output passage extending from the bore to the output port, and a bleed passage communicating with the atmosphere and opening into the bore. A valve cartridge secured to the connection face is operable to conduct liquid between the intake passage and the bore. A vent valve mounted in the output bore has inner and outer seats and a valve body movable between end positions in each of which it blocks one of the seats. The outer seat lies between the inner seat and the connection face and the output passage opens into the bore between the seats. The bleed passage opens into the bore through the inner seat.

Abstract: A vacuum breaker valve includes a body defining a liquid inlet and a liquid outlet and a vent cap structure having vent openings defining an air passage into the breaker element. A float element is slidably disposed on a float post within the breaker to move between a system sealing position and a venting position. The vent cap structure includes a riser structure having a vent wall in which the vent openings are formed and an external cap element. An air permeable water resistant barrier, which substantially prevents foreign debris from entering the piping system through the air passage, is operatively coupled to the vent cap or the body within the air passage. The barrier may be disposed within the riser structure beneath the cap element, may span a gap between the cap element and the riser structure, or may replace the cap element and be attached to the breaker over the riser structure.

Abstract: A cartridge for a valve housing having outlets, the cartridge comprising a stationary body sleeve for fixed insertion within the housing and having outlet ports permanently aligned with the outlets of the housing, a moveable substantially hollow stem sleeve inserted within the stationary body sleeve and having an opening selectively alignable with the ports of the stationary body sleeve, the body sleeve and hollow stem being connected to one another by a retaining ring which aligns and maintains the cartridge as a unit in the housing.

Abstract: A cartridge valve 116 includes a fixed disk 80 and a movable disk 118 mounted in a housing 66. A lever 46 extends through a major opening 72 axially located at one end of the valve 116. The lever 46 is attached to a coupler 130 for facilitating movement of the movable disk 118 relative to the fixed disk 80 to control the flow and temperature of water passing through the valve 116. A flexible valve 144 is attached to the coupler 130 and, in normal use of the valve 116, prevents holes 136 formed therethrough from communicating with a passage formed through the movable disk 118. Air from the environment surrounding the valve 116 can enter the major opening 72, and upon the occurrence of a negative pressure in the water supply, will flex the valve 144 to allow air to enter the supply line to negate the undesirable effects thereof. In another cartridge valve 160, holes 166 are formed through the side wall of the housing 66 to provide further air communication through the holes 136 of the coupler 130.

Abstract: An adjustable height fill valve assembly for controlling water level in a storage tank, comprises a lower riser assembly comprising concentrically disposed inlet riser and an outer riser housing, each having an upper end and a lower end, the inlet riser and the riser housing connected together at the lower ends, the inlet riser being adapted for mounting in a hole in a flush tank, an upper riser assembly comprising concentrically disposed inner supply tube and an outer tubular valve housing, each having an upper end and a lower end, a main valve seat at the upper end of the inner supply tube, the upper riser assembly telescopically mounted on the lower riser assembly, a latch between the riser housing and the tubular valve housing for latching the upper and the lower riser assemblies in selected extended and retracted positions, the latch disengageable upon rotation of the upper riser assembly in either direction from a central position, a valve housing cap having a bayonet lock connection for quick connect d

Abstract: A fluid hydrant has an outlet with a threaded outer surface, and a backflow preventor is mounted on the inlet of the hydrant. The backflow preventor has an inlet and outlet end. Male hose threads are formed on the exterior of the outlet end of the backflow preventer. Interior female threads are on the inlet end thereof. A bushing adapter is interposed between the inlet end of the backflow preventor and the threaded nozzle of the hydrant with the threads connecting the adapter and the backflow preventor being of a size different than the threads connecting the adapter and the threaded nozzle of the hydrant. The bushing adapter extends over the threaded outer surface of the outlet of the hydrant, and a locking cement between the threaded outer surface of the outlet of the hydrant and the interior female threads on the inlet end of the bushing adapter rigidly fix these threads together.

Abstract: In a valving assembly, the combination comprising an outer tubular member having a first flow port; an inner member having closure means thereon to close the port in relatively axially advanced position of the inner member, and to open the port in relatively axially retracted position of the inner member; control means to control relative movement of the inner member between the positions; an axially movable check valve positioned about the axis of the inner member to pass fluid flow from the port and to space defined between the members, and to block reverse fluid flow from the space and through the first port in the inner member relatively retracted position; and a second port to pass fluid from the space in relatively retracted position of the inner member, thereby to relieve pressure of the fluid in the space.

Abstract: A sillcock which has freeze resistance, backflow contamination resistance and back pressure release from the downstream water, having a resilient, radially compressible and expandable back pressure seal valve which is also axially movable a controlled amount to thereby cover or uncover an inner vent hole between the water passage and a vent passage, to allow pressure release from the water flow passage to the atmosphere.

Abstract: A valve device is provided, the base of which includes a lower valve seat of a reflux and aerating valve, which is inserted into a hollow space located above the taps. The hollow space is sealed at the bottom and open at the top and/or side. If the valve device has any sealing flaws, the leaking water is collected, and air flows into the valve device via the hollow space if the pressure in the main water supply drops. If any water seeps out of the valve device due to sealing flaws in the valve, water flows from the lower valve seat to the hollow space of the separator wherein it collects and flows out through the opening in the separator. As a result, leakages in the fittings can be detected easily and quickly.

Abstract: The invention includes an axial-mounted high flow rate valve by fixedly mounting a rotatable valve sealing element so that it pivots on an axis which is substantially parallel to a central axis of the pipe or conduit to which the valve is connected. The rotatable valve sealing element can be not only circular, but non-circular as well, having an extended length along the pivot axis for even greater flow rates and may be particularly suited for installations in sprinkler systems which require greater flow than a normal valve of the same diameter and may even be used as a combination valve for hydrant and sprinkler system use, such as in residential applications. The present invention also may include a purge port to purge residual fluid remaining in the valve, downstream of the valve sealing element, to assist in preventing freezing of the valve and it may include an air port to allow air to enter the valve to alleviate a possible vacuum created by the purging and to enable more effective purging.

Abstract: A back flow prevention device and/or vacuum breaker device for mounting on a plumbing fixture. The device comprises a body having fluid entry means, fluid exit means and backflow prevention means. The backflow prevention means is located between the fluid entry means and the fluid exit means and the backflow prevention means comprises, a chamber having an entry port contiguous with the fluid entry means, an exit port contiguous with the fluid exit means and a back flow prevention port which is open to atmospheric pressure and a valve movably mounted between a first position sealing the entry port and a second position sealing the backflow prevention port. Fluid flowing into the chamber moves the valve out of the first position into the second position thereby allowing fluid to freely flow through the chamber, out the exit port and along the fluid exit means.

Abstract: A cartridge for a valve housing having outlets, the cartridge comprising a stationary body sleeve for fixed insertion within the housing and having outlet ports permanently aligned with the outlets of the housing, a moveable substantially hollow stem sleeve inserted within the stationary body sleeve and having an opening selectively alignable with the ports of the stationary body sleeve, the body sleeve and hollow stem being connected to one another by a retaining ring which aligns and maintains the cartridge as a unit in the housing.

Abstract: A check assembly of a sprinkling head for a kitchen cabinet. The sprinkling head is a hollow L-shaped tube member having a sprinkling opening. A controlling depression grip is connected to a bight section of the sprinkling head. A controlling valve stem is disposed in the sprinkling head. An upper end of the valve stem protrudes out of the bight section and two watertight washers are fitted around the valve stem to abut against peripheral wall of a water outlet formed in the sprinkling head. A lower end of the valve stem is fitted with a conic spring and check assembly and an end of the sprinkling head is connected with a water hose. By means of depressing the depression grip, the controlling valve stem is lifted or lowered to control the sprinkling of the water flow from the sprinkling opening. The check assembly includes a check valve seat, a plastic pin member fitted in the valve seat, a rubber-made soft conic check pad fitted around the pin member and a water inlet seat fitted with the valve seat.

Abstract: A wall mounted water hydrant has an elongated hollow housing with water inlet and outlet ends, and a center axis; an inlet valve in the housing adjacent to the inlet end, including a valve seat and a valve body; a water outlet port in the housing adjacent to its outlet end; a valve operating rod in the housing with its an inner end secured to the valve body and extending along the center axis to the outlet end of said housing, terminating in an outer end; a handle attached to the rod outer end, which when rotated in one direction closes the valve body against the valve seat, and in the other opposite direction moves the valve body away from the seat, thus allowing pressurized water from the inlet to flow downstream through the housing and outlet port; and a backflow preventor secured to the valve downstream from its seat.

Abstract: A wall mounted water hydrant has an elongated hollow housing with water inlet and outlet ends, and a center axis; an inlet valve in the housing adjacent to the inlet end, including a valve seat and a valve body; a water outlet port in the housing adjacent to its outlet end; a valve operating rod in the housing with an inner end secured to the valve body and extending along the center axis to the outlet end of said housing, terminating in an outer end; a handle attached to the rod outer end, which when rotated in one direction closes the valve body against the valve seat, and in the other opposite direction moves the valve body away from the seat, thus allowing pressurized water from the inlet to flow downstream through the housing and outlet port; and a backflow preventor secured to the valve downstream from its seat.

Abstract: A check valve assembly, including a check valve and an associated check valve mounting flange. Additionally, a backflow preventer is shown, which uses a pair of check valve assemblies transversely positioned within a tubular housing. Also disclosed is a method for installing a downstream check valve to a mounting flange, located within a remote, outlet chamber of the backflow preventer housing. The check valve has an elongated base plate, generally elongated in shape. The mounting flange is provided with an elongated hole, sized and configured to pass a properly oriented downstream check valve during installation and removal procedures. The location and design of the downstream check valve assembly ensures that during backflow conditions, the check valve compresses against the mounting flange in sealing engagement.

Abstract: A valve for use in a fluid flow line comprises a housing having a piston chamber with a inlet, outlet, and a vent. An annular outer piston defining a central fluid flow opening is disposed in slidable sealing contact with the housing within the chamber. An inner piston extends axially through the central opening of the outer piston for relative axial movement and is movable in an axial direction between a first position, in which the inner piston blocks the inlet from the chamber, and a second position, in which the inner piston seals the vent from fluid communication with the chamber. The inner and outer pistons, furthermore, are movable relative to each other between an engaged condition, in which the outer piston engages the inner piston to seal the central opening thereof, and a disengaged condition, in which the central opening of the outer piston is open to fluid flow therethrough.

Abstract: A backflow prevention test assembly for a backflow preventer has a test valve in fluid communication with a conduit of the backflow preventer and a test kit. The test valve has a body defining an axial bore, and a piston defining a test conduit is disposed within the axial bore for movement between a first position permitting test flow through the test conduit and a second position resisting test flow. The piston is biased toward the second position. The test kit includes a test apparatus and a fitting for attachment upon the test valve body in sealing engagement. The fitting defines a displacement surface for engagement, after sealing engagement of the seal with the test valve, with an opposed surface of the piston to urge the piston toward its first position, thereby to establish fluid communication between the test apparatus and a region of the backflow preventer conduit. A method of testing fluid within the flow conduit of the backflow preventer is also described.

Abstract: A vacuum breaker assembly includes an outlet tube having circumferential air ports and a vacuum breaker sleeve formed of a flexible elastomeric material positioned within the outlet tube. Conventionally, a stiffening funnel will be positioned within the vacuum breaker sleeve. The elastomeric sleeve has an inlet end and an outlet end and is located within the outlet tube adjacent the spaced air ports. The vacuum breaker sleeve has lip seals in the interior intermediate the inlet and outlet ends, with the lip seals opening in response to water pressure at the inlet end to permit water to pass through the vacuum breaker assembly. There are peripherally spaced projections on the exterior of the vacuum breaker sleeve adjacent the outlet end to space the exterior of the sleeve from the outlet tube. There is a tapered lip seal extending axially from the outlet end of the vacuum breaker sleeve, with the lip seal being downstream of the spacing projections.

Abstract: A fluid flow control valve, e.g. a pressure vacuum breaker, includes a thermal expansion relief valve for protecting the control valve against damage due to freezing. The control valve has a valve body of rigid material and defines a main conduit. The thermal expansion relief valve has a relief valve body mounted to the main valve and defines a relief conduit in fluid communication with the main conduit, a valve element the moves within the relief conduit between a first sealing position in engagement with a valve seat to resist flow and a second position spaced from the valve seat to allow flow from the main conduit through the relief conduit, and a spring urging the valve element toward sealing position with a predetermined force selected to exceed normal operating pressure of the main valve and to lie below pressure damaging to the main valve. A thermal expansion valve for protecting fluid flow control valves, e.g. by retrofit, is also described.

Abstract: The present invention discloses a valve which utilises an imbalance of flow induced pressure forces to keep the valve open or closed. The valve has an interior cavity (15) into which an opposite and aligned inlet (12) and outlet (13) open. A bulbous body (16) is located within the cavity and is reciprocally mounted on a spindle (17) which passes through the outlet. Movement of the body increases the flow area at one end of the body and decreases the flow area at the other end of the body. In accordance with Bernoulli's theory this changes the pressures acting on the body (16) giving rise to a net force on the body. A cistern inlet valve (111,211) and cistern (19) are also disclosed.

Abstract: A valve assembly which is suitable for backflow prevention in a stop cock having an inlet, a seat and an outlet. The valve assembly may be attachable to the stop cock and includes a valve body having at least one opening and also including a valve chamber and a valve seat. There is provided a balance tube in the valve body which communicates with the valve chamber which has one end engaged with the stop cock seat for sealing against the seat for prevention of flow of fluid from inlet to outlet, a piston located within the valve body and engageable with the valve seat, and biasing means operable to unseat the piston from the valve seat to enable the outlet to communicate with the valve body opening. In a further embodiment the valve assembly also includes a third seat in the handle and a valve member biased open by a spring against inlet pressure to allow atmosphere air to break a vacuum at the inlet.

Abstract: An anti-syphon valve comprises a base pipe having inlet and outlet legs and a valve seat, disposed at the top of the base pipe within a valve stem post, which can be rotated selectively to block the inlet leg (closed position) or open it (open position). A metering peg extends from the valve stem post into a receptacle in the valve seat. Inlet and outlet passages corresponding to the inlet and outlet legs are disposed above the seat, and a float located at the top of the inlet passage allows fluid flow from the inlet passage into the outlet passage in the open position while blocking fluid flow from the outlet passage to the inlet passage in the closed position. Vent passages are provided above the float to enable communication of the outlet passage to atmosphere in the closed position. A handle is provided on the valve stem post to selectively rotate the latter to place the valve in open or closed position.

Abstract: An anti-syphon valve comprises a base pipe having inlet and outlet legs and a valve seat, disposed at the top of the base pipe within a valve stem post, which can be rotated selectively to block the inlet leg (closed position) or open it (open position). A metering peg extends from the valve stem post into a receptacle in the valve seat. Inlet and outlet passages corresponding to the inlet and outlet legs are disposed above the seat, and a float located at the top of the inlet passage allows fluid flow from the inlet passage into the outlet passage in the open position while blocking fluid flow from the outlet passage to the inlet passage in the closed position. Vent passages are provided above the float to enable communication of the outlet passage to atmosphere in the closed position. A handle is provided on the valve stem post to selectively rotate the latter to place the valve in open or closed position.

Abstract: In a valve space surrounded by a housing is arranged a sleeve-shaped valve body made of elastomeric material. The valve body is fastened with a fastening end thereof to the housing, and a flow channel thereof is flow-connected to an inlet orifice. The valve body bears, with a middle portion of the valve body spanning a ventilation orifice, on a ventilation-valve seat formed on the housing. There adjoins the middle portion a bead which the end portion, bearing under prestressing on the valve-seat element, adjoins on the other hand. With water flowing in the direction of flow and also with an equal pressure prevailing on the inlet side and outlet side, the valve body bearing on the ventilation-valve seat prevents the outflow of water through the ventilation orifice. With a negative pressure prevailing on the feed side, the middle portion lifts off from the ventilation-valve seat, in order to ventilate the outlet orifice.

Abstract: A backflow prevention assembly is disclosed which provides for detection of backflow conditions. The backflow preventer assembly includes a housing having an inlet, an outlet and a discharge opening. A pair of independent check valves is positioned within the housing between the inlet and the outlet. The check valves are mechanically and hydraulically independent from each other and each adapted to seal the inlet from the outlet during backflow conditions. A relief valve is positioned within the housing between the check valves to selectively seal the discharge opening. An alarm is coupled to the relief valve to provide a signal when the relief valve is opened indicating backflow and discharge conditions.

Abstract: An anti-syphon valve comprises a base pipe having inlet and outlet legs and a valve seat, disposed at the top of the base pipe within a valve stem post, which can be rotated selectively to block the inlet leg (closed position) or open it (open position). A metering peg extends from the valve stem post into a receptacle in the valve seat. Inlet and outlet passages corresponding to the inlet and outlet legs are disposed above the seat, and a float located at the top of the inlet passage allows fluid flow from the inlet passage into the outlet passage in the open position while blocking fluid flow from the outlet passage to the inlet passage in the closed position. Vent passages are provided above the float to enable communication of the outlet passage to atmosphere in the closed position. A handle is provided on the valve stem post to selectively rotate the latter to place the valve in open or closed position.

Abstract: A frost-resistant hydrant includes a conduit or body tube connected with a fluid source, a valve, an actuator stem connected with the valve, and a flow-through stem defined by a fluid passage through the valve and the actuator stem. The valve preferably includes a ceramic disk stack rotatable between an open position and a closed position. A combination back-flow preventer and vacuum breaker is positioned in the flow-through stem. The actuator stem has a rotation limit enabling the valve to move between fully open and closed positions within 90 degrees. A cartridge body incorporating the valve includes an anti-rotation key engaging the conduit and fixing the rotational position of the valve cartridge relative to the conduit.

Abstract: A flow disconnector has an intermediate chamber connected between inlet and outlet check valves. A diaphragm controls a venting valve for the intermediate chamber which is designed to empty the intermediate chamber when the difference between inlet pressure and intermediate chamber pressure becomes too small. To prevent unnecessary emptying of the intermediate chamber, a pressure stabilizer is connected between the inlet and the intermediate chamber. The stabilizer holds the pressure in the intermediate chamber below the inlet pressure by an amount sufficient to prevent unnecessary emptying of the intermediate chamber.

Abstract: A faucet with a vacuum breaker for a pull-out spray head plumbing fixture is provided. The vacuum breaker is in the faucet housing and provides a guide for and surrounds an extendible and retractable hose connected to the pull-out spray head. The vacuum breaker has a flapper valve stretch fitted over a body member of the vacuum breaker. The body member also affords pivotal attachment of a spout. A tubular guide for the hose also provides a quick connect or disconnect feature.

Abstract: A vacuum breaker is provided comprising a body member having an inlet and an outlet defined therein. A core insert member may be threadedly engaged within the body member having a chamber defined therein. A vent passage is defined within the body member to vent the outlet side of the device to atmosphere. A piston member is movably disposed within the chamber between an upper limit stop and a lower limit stop so as to variably restrict liquid passage through the device. At its lower limit stop, the piston essentially seals the inlet from the outlet while the vent passage vents the outlet to atmosphere. At its upper limit stop, the piston essentially seals the vent passage from the outlet. A drain passage is defined within the device generally between near the top portion of the chamber and the outlet so that liquid entrapped within the chamber above the piston member drains through this drain passage to the outlet side of the device during movement of the piston within the chamber.

Abstract: An automatic draining back flow prevention apparatus, for use with hydrant structure, comprising tubular body structure having main passage structure between flow entrance and exit ports; the body structure having a first side port communicating with the passage structure; diaphragm structure carried by the body structure to be exposed to flow in the passage structure; a stopper in the passage structure cooperating with the diaphragm structure to pass forward fluid flow from the hydrant structure, while the diaphragm structure is positioned to block exit flow of fluid through the first side port, and to block back flow of fluid through the main passage structure when the diaphragm structure moves to unblock flow of fluid through the first side port; a first seat in the body structure exposed to the passage structure, and seating the first diaphragm as it moves to block flow of fluid through the first side port; and spring structure carried by the body structure to urge the stopper toward the first diaphragm,

Abstract: A fluid flow system (20) includes fluid inlet conduits for supplying fluid through a fluid flow path (86) as formed by a manifold (74) and a module (76). The fluid is directed through fluid flow path (86) to a flexible conduit (54) and to a fluid dispensing wand (36) whereat the fluid can be selectively dispensed in a stream or a spray. A linking passageway (102) is formed by manifold (74) and module (76) to couple selectively the pressure of a pressurized environment, such as atmospheric pressure, to fluid flow path (86). An umbrella valve (104) is located in linking passageway (102) and is responsive to the development of a negative pressure at the fluid supply and thereafter couples the pressure of the pressurized environment to fluid flow path (86). This action neutralizes the effects of the negative pressure and precludes the reverse flow of fluid within fluid flow system (20).

Abstract: A tank valve for refilling a water tank. A vertical riser has a passage opening through a valve seat in a body. A flow chamber and a discharge chamber are formed around the valve seat. A cap is secured to the body so as to overlay the chambers. The cap has a central socket opening, a plurality of laterally-spaced anit-siphon ports, and a contact surface. The anti-siphon ports open onto the contact surface. A valve control device has a rigid case with a neck and an engaging shoulder. An anti-siphon disc has a hole through which the neck is passed. The neck is inserted in the socket opening and the engaging shoulder presses the disc against the cap. A bias chamber is formed in the case. A retainer is secured to the case. It includes a retaining shoulder which holds a flexible diaphragm to close the bias chamber. The diaphragm has a bias port therethrough. A level controlled valve opens and closes a vent port in the neck.

Abstract: A diaphragm controlled irrigation valve (20) is disclosed which includes a captivated relief member (60). The captivation is achieved by a stop (100) which radially extends from the member to abut the valve housing (23).

Abstract: A plumbing system is provided with a coupling having a chamber, an inlet passageway through which a fluid may enter the chamber from a supply, an outlet passageway through which a fluid may exit the chamber and the coupling, and a vent passageway in fluid communication with the chamber and having a vent inlet in communication with ambient atmosphere and a vent outlet in communication with the chamber. The coupling is provided between a source of liquid (e.g. a control capsule for mixing hot and cold water supplies via a user operable valve) and an outlet nozzle (e.g., a hose-connected spray head). A vacuum breaker check valve is located in the vent passageway of the coupling and includes a valve member for closing the vent inlet when pressure in the chamber is greater than pressure at the vent inlet and for opening the vent inlet when pressure in the chamber is less than pressure at the vent inlet.

Abstract: A backflow preventer used in combination with a valve that normally supplies water under pressure to a feed conduit and with an outlet device having a supply hose to which water is normally supplied under pressure has a housing forming a generally closed chamber and formed with an inlet port connected with the feed conduit and opening into the chamber, an outlet port connected to the hose and opening into the chamber directly underneath the inlet port, and a vent port having an outside exposed to ambient air and forming substantially the only direct passage between the chamber and an ambient atmosphere around the housing. A check valve in the vent port only permits flow through the port into the chamber so that air can be drawn into the chamber through the vent port when pressure in the chamber is below ambient pressure. A nozzle fitted to the inlet port directed downward along a vertical axis into the outlet port forms therewith a jet pump for transferring water from the inlet port to the outlet port.

Abstract: A restrictor valve functions as an outlet valve in a metered liquid dispensing system and utilizes a spring biased, shiftable anti-siphon check valve to prevent fluid flow back from the receiving tank into the system. The restrictor valve is attached to the delivery end of the system discharge hose. The dispensing system is controlled by a central electronic unit and the restrictor valve includes a sensing unit for signalling the electronic control when liquid is present at the outlet. The restrictor valve is connected to the receiving tank by a low spill coupling to minimize escape of the liquid into the environment. The restrictor valve may also include a vacuum breaker valve which admits air into the discharge hose when the system pump is run in reverse to remove the prime from the discharge hose.

Abstract: An automatic draining back flow prevention apparatus comprises tubular body structure having main passage structure between flow entrance and exit ports; the body structure having first and second side ports communicating with the passage structure; first and second diaphragms carried by the body structure to be exposed to flow in the passage structure; a stopper in the passage structure cooperating with the first diaphragm to pass forward fluid flow while a first diaphragm flexes to block exit flow of fluid through the first side ports, and to block back flow of fluid through the main passage structure when the first diaphragm moves to unblock exit flow of fluid through the first side port; the second diaphragm moving to block exit flow through the second side port in response to the forward flow of fluid through the main passage structure, and being movable to allow drainage flow of fluid through the second side port during at least one of the following conditions: when the stopper and first diaphragm block

Abstract: In order to prevent contamination of a fluid source and to ensure drainage of a sill cock or the like, a detachable check valve back flow preventer for installation between a fluid inlet line and a fluid outlet line is provided. A housing with means for fastening the device to a fluid inlet line at one end of the housing and for connecting a fluid outlet line at the other end of the housing is provided. The housing has a central cavity within the housing. An inlet line drain valve is located within the housing between the central cavity and the fluid inlet line to provide for the drainage of fluid from the fluid inlet line to the fluid outlet line end of the housing when the fluid outlet line is not connected to the back flow preventer. A second valve is located within the housing between the central cavity and the fluid inlet line to control flow of fluids between the fluid inlet line and the central cavity.