Abstract: A fuel injection system for internal combustion engines, having a high-pressure pump, whose pump work chamber can be made to communicate on the intake side with a fuel tank via a supply line and on the compression side with a common rail via a high-pressure line, from which common rail a plurality of injection lines lead away to the individual injection valves, and having one pressure valve each in the supply line and the high-pressure line, by way of which a return flow of fuel out of the pump work chamber into the supply line and out of the high-pressure line into the pump work chamber is prevented. The pressure valve of the supply line and the pressure valve of the high-pressure line are disposed in a common valve combination.

Abstract: A bileaflet prosthetic valve has leaflet pivots symmetrically or centrically located, thereby providing a central opening about twice the size of the two lateral openings. The valve opens from the center outward to provide nonturbulent central flow. The laminar leaflets are curved in cross-section so that the downstream edges of the leaflets are closer to the centerline of the cylindrical support ring when the leaflets are in an opened configuration. This position disposes the leaflets to favor valve closure when reverse flow of blood occurs. As the leaflets move toward a closed position, upstream edges of the leaflets begin to close the lateral openings, but this movement is opposed by blood flowing through these openings thereby providing a force to decelerate the leaflets and cushion their final closing.

Abstract: The present invention is directed to an inversion-resistant tide gate valve comprising a generally tubular sleeve bounding a longitudinally-extending flow-through passage for fluids, the sleeve having an upstream fluid inlet end region adapted to be affixed to an effluent conduit and a downstream fluid outlet region, the downstream fluid outlet region of the sleeve being integrally formed with a longitudinally-extending trough, where the trough is formed of an integral bottom wall and an integral pair of side walls. A disc is affixed along a first portion of its periphery with a flexible member to the downstream fluid outlet region of the sleeve, and a second portion of the periphery of the disc opposite the first portion rests within the trough on the bottom wall of the trough.

Abstract: A limited backflow reflux valve for connection between a syringe, catheter, and bulk container of injection fluid. The reflux valve permits injection of fluid from the syringe through the catheter into the patient, and also permits refilling of the syringe from the bulk container, without disconnection of any tubing. The reflux valve also permits a limited volume of fluid to backflow from the catheter into the syringe, so that the catheter may be checked for patency, but prevents any further backflow along this path after this limited volume. Therefore, the limited backflow reflux valve not only permits injection through the catheter, but also permits both withdrawal of blood from the patient and refilling of the syringe from the bulk contrast media container, without requiring disconnection of the catheter or other tubing and without risk of contamination of the syringe or introduction of air, increasing the efficiency of the injection process, enhancing safety, and reducing waste of injection fluid.

Abstract: A hollow through-bolt is threaded internally and externally, at one end, to receive therein a reciprocable, end-threaded rod. A pair of fluid-control valves, centrally bored, are mounted on the through-bolt in spaced apart disposition. The other end of the through-bolt has a shoulder formed thereon for seating one of the valves thereagainst, and the other valve central bore is tapped for threaded engagement with the one end of the through-bolt. A sleeve, slidably engaged with the through-bolt, and interposed between the valves, maintains the one valve positioned against the shoulder.

Abstract: A connector for joining two tubes together. A female connector with a cavity made of resilient material such that when the male and female connectors are joined the leakage from the tube ends is minimal. In addition, the cavity made of resilient material resilient will only loosely hold onto the outside surface of the male connector such that the two connectors will disconnect quickly and automatically when a relatively low tensional or shearing force is applied across the joined connector. Valve means are also provided to prevent leakage out of both connectors when the connectors are disconnected.

Abstract: A liquid pumping, handling and spraying system for liquid compositions and especially those liquid coating compositions having a suspension of metal particulate therein which tends to settle out of suspension of metal particulate therein which tends to settle out of suspension quite rapidly and which includes metal particulate having an affinity for adherence to metal surfaces. A fluid supply system is provided which accomplishes continuous agitation of the liquid composition to sprayed to maintain the metal particulate thereof in properly entrained suspension and even distribution with the liquid carrier fluid and which permits the use of low cost, lightweight containers for the liquid supply. A packingless pump is provided for pressurized delivery of the liquid composition from the supply container to a packingless spray gun.

Abstract: An apparatus for replacing particles in a process that transfers particles is disclosed. The apparatus employs a seal zone which is in communication with two zones of the process and in which particles that are being added to the process are purged. The apparatus allows particles to be replaced without reducing the normal rate of particle transfer through the process, which results in a savings in downtime costs. This invention is adaptable to a multitude of processes for the catalytic conversion of hydrocarbons in which deactivated catalyst particles are regenerated.

Abstract: An improved mixing unit and check valve for a fluid pumping system wherein gradient proportioning is performed at high pressure are described. The mixing unit has lining means disposed on the inner surface of the chamber for preventing frictional contact between the steel of the chamber and the surface of the rotor. The lining means is formed of a polymeric material selected for frictional compatibility with the rotor, and avoids formation of undesirable particulates by friction with the rotor surface. The check valve has a poppet comprising a midsection dimensioned to provide forward and rearward surfaces against which fluid flow will exert force, a first arm extending transversely from the midsection first side toward the valve inlet, a second arm extending transversely from the midsection second side toward the valve outlet, and first and second resilient seals respectively annularly disposed about the first and second arms.

Abstract: A limited backflow reflux valve for connection between a syringe, catheter, and bulk container of injection fluid. The reflux valve permits injection of fluid from the syringe through the catheter into the patient, and also permits refilling of the syringe from the bulk container, without disconnection of any tubing. The reflux valve also permits a limited volume of fluid to backflow from the catheter into the syringe, so that the catheter may be checked for patency, but prevents any further backflow along this path after this limited volume. Therefore, the limited backflow reflux valve not only permits injection through the catheter, but also permits both withdrawal of blood from the patient and refilling of the syringe from the bulk contrast media container, without requiring disconnection of the catheter or other tubing and without risk of contamination of the syringe or introduction of air, increasing the efficiency of the injection process, enhancing safety, and reducing waste of injection fluid.

Abstract: A high-pressure, plunger-type liquid pump including a liquid manifold that includes a plunger chamber in the form of an axial cylindrical bore portion for slidably receiving a pressurizing plunger, and that also includes a valve chamber coaxial with the plunger chamber and in communication therewith for removably receiving a cartridge-type flow control valve. The liquid manifold includes a closure plug to close the valve chamber. The cartridge-type valve is slidably received in the valve chamber for enabling removal of the cartridge-type valve from the liquid manifold without the need for separating the liquid manifold from the pump drive housing. The cartridge-type valve is of a structure that includes in-line, axially spaced suction and discharge valves that are each spring biased into closed positions.

Abstract: There is provided a fluid side of a high pressure water pump is to be used with a pump having a power side which has at least one piston and at least one stuffing box. The fluid side consists of a unitary substantially block shaped fluid end which defines a generally cylindrical fluid inlet bore, a generally cylindrical fluid outlet bore, and at least one generally cylindrical working bore. The working bore intersects the fluid inlet bore and the fluid outlet bore. Within each working bore there is sealably provided a substantially tubular suction/discharge seat which has a longitudinal axis, a suction end, a discharge end, an outside surface extending between the suction end and the discharge end, and an inside surface extending between the suction end and the discharge end. The suction/discharge seat defines a plurality of fluid holes at the suction end which provide a flow path of a fluid from the fluid inlet bore to the inlet end of the fluid end.

Abstract: The invention provides a self-cleaning inlet head for a fluid, operable in a first, draining, mode and in a second, backflushing, mode, including a body having a front end and a rear end; a piston slidably mounted in the body and having having a front face and a rear face; a first space extending between the rear end of the body and the rear face of the piston and a second space extending between the front face of the piston and the front end of the body; a bore connecting the first space and the second space; a valve mounted in the first space for closing off the bore during the second mode of operation; an aperture for access of the fluid from outside the head into the second space in the first mode of operation, and for exit from the second space in the second mode of operation, wherein, at the onset of the second mode of operation, the valve closes off the bore and subsequently moves the piston, thereby initiating a mechanical shearing action loosening any occluding matter in the aperture.

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 heat trap for hot water storage tanks is described and it comprises an outer tubular casing having opposed connecting end portions. The casing has an inner chamber which is divided to provide a convoluted water flow path. This convoluted water flow path can be provided by having concentric channels defined with the interior of the casing, or by having a member with two longitudinally spaced apart circular end walls joined by vanes extending radially from the central axis of the end walls. The first and second vanes have passages therein adjacent opposed ends. The opposed ends of the casing may also be a threaded tapered portion to connect the heat trap to threaded holes of different sizes depending on the make of the hot water tank.

Abstract: A water meter and backflow preventer for use in a water supply system having a meter box includes a housing having water infeed and outfeed openings which are connected to supply water from a main utility pipeline to a water customer domestic system through a pair of infeed and outfeed shut-off valves and a water meter mounted within the housing. A double check valve is installed in the water circuit in the housing to enable use of the double check method of backflow prevention. Test ports are provided through the housing to enable the housing unit to be testable for leaks through the valves. The water meter and backflow preventer combines backflow prevention integrated with an AWWA-approved water meter in one product having the same overall lay length as a current water meter to eliminate the need for re-fitting pipe or using adapters within the meter box.

Abstract: A one-way valve of simple construction comprises a body provided with appropriate bores and four legs. A ball is positioned between the legs which are then bent towards each other to retain the ball in the body.

Abstract: The invention disclosed relates to an apparatus for permitting uninterrupted relief of cargo tank compartment internal pressures while also preventing the leakage of lading from the cargo tank to the surrounding atmosphere during sudden increases in the cargo tank internal pressure. According to one embodiment of the present invention, the cargo tank compartment pressure relief valve comprises a flow chamber coupled to an opening in the cargo tank compartment wall, wherein the flow chamber has a first opening in flow communication with the tank compartment and a second opening in flow communication with the atmosphere, whereby the first opening is under the control of a downwardly biased first vent head and the second opening is under the control of a downwardly biased second vent head.

Abstract: A backflow preventor which permits adjustment of the outflow direction is provided. A conduit provides fluid communication between the two valves of the backflow preventor. The conduit can be separated, e.g., by cutting along a groove, leaving annular flat regions. The annular flats are configured to engage with a coupler to provide leak-free connection between the separated portions of the conduit. The separated portions of the conduit can be rotated to adjust the outflow direction. Preferably, an infinite number of outflow directions are possible, all of which lie in a plane parallel to the inflow direction.

Abstract: Homogenizing pressures are reduced by providing three homogenizing valves in series. The addition of a holding chamber between the first and second stages which provides a dwell time in the order of seconds can further reduce the pressure requirements or improve product quality for a given pressure.

Abstract: A valve assembly for a compressor or the like having improved sealing and noise reduction characteristics. A reed valve is provided with a gasketing layer, such as expanded graphite, which confronts the orifice plate. One reed valve plate also incorporates an integral, formed limiter portion to reduce the number of parts requiring assembly.

Abstract: A compact manifold for distribution of fluids (gas or liquid or combination thereof). The manifold has a block having fluid channels provided therethrough between two faces of the block. Against one face, a plate is fastened which swages ferrules between the plate and the block to tightly connect fluid conduits through the plate to the block. On the opposite face of the block, a manifold plenum is formed in a groove between a manifold plate and an o-ring. The o-ring is pressed against the manifold plate by a back plate and both plates are securely fastened onto the block such that the holes in the manifold plate are aligned with the fluid channels in the block. Checkvalves are positioned between the block and the manifold plate to prevent backflow. The above-mentioned components are positioned into their respective places and are secured upon the tightening of the fasteners. The manifold is configured with at least two plenums each having a group of distribution outlets.

Abstract: A backflow preventor which permits adjustment of the outflow direction is provided. A conduit provides fluid communication between the two valves of the backflow preventor. The conduit can be separated, e.g., by cutting along a groove, leaving annular flat regions. The annular flats are configured to engage with a coupler to provide leak-free connection between the separated portions of the conduit. The separated portions of the conduit can be rotated to adjust the outflow direction. Preferably, an infinite number of outflow directions are possible, all of which lie in a plane parallel to the inflow direction.

Abstract: A check valve manifold assembly contains multiple inlet and outlet ports extending through a housing into a fluid passageway. The fluid passageway interconnects the various ports, and the housing further contains multiple check valves, one such valve being associated with each of the ports. When used with an active perfusion pump, the manifold system permits easy and proper perfusion of the patient at high pressures.

Abstract: A fluid dispensing system for delivering sterile preservative-free solution is disclosed. The system uses double self-sealing valves mounted in series inside a tip compartment which fits on the outlet of a multiple dosage squeeze container to prevent undesirable retrograde flow of the dispensed liquid back into the bottle during the decompression cycle. The valves used are either positive acting, normally closed duckbill and/or umbrella valve(s) which open to express solution from the container when squeezing pressure is applied to the bottle and which automatically close when the pressure is released. The fluid dispensing system with an umbrella valve near the system outlet has close to zero dead space volume thereby practically eliminated possible contamination of the sterile fluid under the circumferential seal head portion of the umbrella valve and in the container. A hydrophobic filter is provided to sterilize the replacement air which enters the container upon release of the squeezing pressure.

Abstract: A discharge valve is incorporated into a scroll compressor for use in a refrigerator or an air conditioner. A valve element seating surface having a concave cylindrical shape is formed in the upper surface of the stationary disk of the stationary scroll plate of the scroll compressor, a discharge port is formed through the stationary disk of the stationary scroll plate so as to open in the valve element seating surface, and a discharge valve element having a cylindrical shape conforming to the concave cylindrical shape of the valve element seating surface is seated on the valve element seating surface so as to open or close the discharge port. The valve element seating surface having a concave cylindrical shape facilitates machining the stationary scroll plate, reduces the top clearance of the scroll compressor without reducing the rigidity of the stationary disk, prevents the concentration of stress on the delivery valve, and improves the reliability of the delivery valve.

Abstract: A throttle valve of a diving respirator, wherein an orifice valve is inserted slidably in a hole of a cylindrical valve body, an orifice is formed in said valve body so as to communicate a gas outlet and a gas inlet formed on the valve body, and a gas passage is formed between the gas outlet and the gas inlet, which is opened only when a gas pressure in the gas inlet is elevated to a predetermined valve so that the orifice valve is moved relative to the valve body.

Abstract: A fluid dispensing system for delivering sterile preservative free solution is disclosed. The system uses double self-sealing valves mounted in series inside a tip compartment which fits on the outlet of a multiple dosage squeeze container to prevent undesirable retrograde flow of the dispensed liquid back into the bottle during the decompression cycle. The valves used are positive acting, normally closed duckbill valves which open to express solution from the container when squeezing pressure is applied to the bottle and which automatically close when the pressure is released. A hydrophobic filter is provided to sterilize the replacement air which enters the container upon release of the squeezing pressure.

Abstract: An oral inflation and relief tube for connection to an inflatable article. The oral inflation and relief tube includes an elongated tube having an oppositely positioned first opened end and second opened end, with a flanged opening positioned therebetween at ninety degrees for connection to the inflatable article. The flanged opening comprises a mounting flange and boss integrally formed through a wall of the elongated tube. The oral inflation and relief tube also includes an inflation valve sealingly positioned within the first opened end as well as a relief valve sealingly positioned within the second opened end. The elongated tube comprises an in-line configuration.

Abstract: An energy conserving device for the prevention of heat loss resulting from convection currents in water heater systems comprising a housing component adapted for mounting on the water heater system inlet and outlet ports, a mounting component rigidly supported inside the housing component, and at least one seal component rigidly attached to the mounting component. The seal component is formed from a flexible material and extends from the mounting component to the inside surface of the housing component to make sealing contact with the housing component to prevent the flow of water caused by convection currents while allowing the flow of water when water is drawn from the water heater system.

Abstract: A pulmonary valve for use with fitness level respiratory testing equipment, having a tubular silicone rubber body member. Formed at one end of this member is a mouth seal which is subsequently inserted into a subjects mouth. In the superior surface of the tubular body member is found the inhalation ports, these ports allow for air passage during inhalation. Within the tubular body member is housed two valve membranes, one for inhalation and one for exhalation. During inhalation, the inhalation membrane opens, creating an airflow passage-way directly to a subjects's mouth cavity. During exhalation the inhalation membrane closes shut and the exhalation membrane opens thus creating a second and separate airflow passage-way, at the end of exhalation the exhalation membrane closes shut, thus completing one respiration cycle. Because of the unique membrane design there is found no equipment dead space.

Abstract: A valve for controlling the flow of fluid through a flow path, which valve comprises a housing defining a flow path and having two indented portions about the flow path, a poppet mounted within each indented portion such that the internal end of each indented portion defines a seat which provides a fluid tight seal when the associated poppet head is held against the seat, a spring associated with each poppet for holding each poppet against each seat, a rigid moveable member associated with each poppet and adapted to alter the orientation of the associated poppet relative to its seat and thereby seal or unseal the flow path around the poppet, and an actuator for moving each movable member; and inflator apparatus incorporating at least one valve.

Abstract: A check valve having a valve housing with an outlet fluid passage and a housing valve cavity in communication with each other. A valve body has an inlet fluid passage and a body cavity in communication with each other. The valve body is sealably secured to the valve housing. A valve poppet is slidably mounted within the body cavity. The valve poppet has a central cavity. A side wall of the valve poppet has a poppet through hole which is in communication with the central cavity. The valve poppet has a poppet shoulder portion and an extension portion. A seal disk has a seal disk through hole into which the extension portion of the valve poppet is positioned. The seal disk is positioned within the housing valve cavity. A closure spring is used to normally urge the valve poppet into a closed position in which the valve poppet preferably abuts a sealing surface of the valve body.

Abstract: A toggle linkage check valve includes a housing having an inlet and an outlet, and a valve assembly disposed within the housing. The valve assembly includes (i) a sealing plug adapted for movement between a first, closed position for preventing flow of liquid between the inlet and the outlet, and a second, open position for substantially permitting flow of liquid between the inlet and the outlet, and (ii) a spring assembly removably disposed within the valve assembly. The spring assembly contacts the sealing plug and biases the sealing plug towards the first, closed position. The spring assembly comprises a rod member and means for biasing the rod member toward the sealing plug. In the second, open position of the sealing plug, the rod member lies at an acute angle to a plane of the sealing plug.

Abstract: A body having a longitudinal axis, and parallel bearing surfaces at opposite axial ends thereof, has grooves formed therein, adjacent both axial ends thereof for receiving sealing rings therein. The body is interposed between fluid-control valves which are centrally supported, in spaced-apart disposition on a reciprocable rod, for abutting engagement thereof with the outermost peripheries of axial ends of the valves to support the valves and prevent bending moments from being exerted on the valves, and the grooves-receivable sealing rings offer enhanced fluid sealing over that carried by the valves themselves.

Abstract: A backflow preventor which permits adjustment of the outflow direction is provided. A conduit provides fluid communication between the two valves of the backflow preventor. The conduit can be separated, e.g., by cutting along a groove, leaving annular flat regions. The annular flats are configured to engage with a coupler to provide leak-free connection between the separated portions of the conduit. The separated portions of the conduit can be rotated to adjust the outflow direction. Preferably, an infinite number of outflow directions are possible, all of which lie in a plane parallel to the inflow direction.

Abstract: An angled check valve has a valve housing with an inlet for admitting fluid flow into the housing in a first direction and an outlet for discharging fluid flow from the housing in a second direction. The first direction and the second direction are generally perpendicular. An inlet check assembly in the housing has a valve member movable in the first direction for preventing fluid flow from exiting the housing through the inlet. An outlet check assembly in the housing has a valve member movable in the second direction for preventing fluid flow from entering the housing through the outlet. In order to facilitate assembly and service of the check valve, the housing has an opening extending in the second direction through which the inlet check assembly and the outlet check assembly can be assembled into and removed from the housing.

Abstract: An angled check valve assembly having a housing with inlet and outlet passageways angled with respect to each other, and a spider spacer cage at a location which allows flow through the inlet passageway into the spider spacer cage where the flow is then angled and directed through the outlet passageway. One of the passageways has one-way check valve(s) therein to insure one-way flow from the inlet through the outlet passage. An installation entry is provided in the housing for insertion of the check valve(s). The installation entry is sealingly closed by a threaded closure member. The spider spacer cage is rotatable relative to the threaded closure so that, as the closure member is moved inwardly, at least one opening (in the side of spider spacer cage) can be kept in registry with one of the passageways. The spider spacer cage also forces the one-way valve(s) toward an abutment in the housing.

Abstract: A unidirectional flow heart valve includes a passageway having an inlet side and an outlet side. A disk occluder is disposed within the passageway. The disk occluder has a closed position wherein the disk occluder occludes fluid flow through the passageway and an open position wherein the disk occluder permits fluid flow through the passageway. A fulcrum causes the disk occluder to pivot off center between the open and closed positions. An electromagnetic control mechanism forces the disk occluder to remain closed when energized until a predetermined net pressure is reached against the disk occluder. When the electromagnetic control mechanism is either selectively deenergized or the force on the occluder disk is greater than the holding force of the electromagnetic control mechanism, the disk occluder is released from the closed position to pivot on the fulcrum in response to fluid pressure.

Abstract: A water hydrant defines an elongated flow passage having a water inlet and an air inlet, and a laterally extending water outlet spout disposed therebetween to define an outlet. An elongated rotatable stem is reciprocated within the flow passage, and terminates in an exterior handle. A water inlet valve is connected to the stem for control of flow from the water inlet into the passage and an air valve is connected to the stem to control inflow of air and preclude outflow of water through the air inlet. A first check valve in the spout precludes backflow of water into the passage, movement of the air valve opening the first check valve during operation of the handle. A second check valve in the spout downstream of the first check valve precludes backflow of water into the spout. A drain orifice, open to the atmosphere, extends through the spout between the check valves.

Abstract: A backflow preventor with increased performance, and increased ease of installation is provided. The check valves are configured to assist in redirecting flow along the desired pathway, when they are in the open position. The pathway is designed so that the number of changes of flow direction of the average streamline flow is reduced, preferably being about 180.degree.. The check valves are configured to reduce or eliminate divergent flow around the edges of the valve disks. A check valve with a reduced hold-open pressure includes a biasing device, such as a spring, directly connected to a pivoting clapper at one end and to the valve body at the other end. No intervening pivoting links are used between the spring and the clapper. Preferably, the clapper is connected only by being pivoted to the valve body and by the spring connecting it to the valve body.

Abstract: An apparatus for cleaning fluid lines is disclosed. This apparatus contains a fluid manifold, a valve, and a line connecting said fluid manifold and said valve. The valve used in the apparatus contains at least two input ports, at least two output ports, means responsive to fluid pressure for closing off the flow of liquid from a first of said ports, and means responsive to fluid pressure for opening the flow of liquid from a second of said ports.

Abstract: A single or multi-cylinder compressor unit being cylinder wall ported and having suction inlet means to compression chamber means through the wall and top of piston means, wherein suction valve means comprises preferably a light-weight plastic disc means mouted in an essentially free-floating manner in the piston means top, the discharge valving cooperatively comprises discharge porting plate means and discharge valve disc means reciprocably mounted on bearing means in the compressor head for enhanced operating accuracy and seat longevity and adapted to seal discharge port aperture means in the plate means on the suction stroke, and wherein the piston means top, the compression side of the suction valve disc means, the compression side of the porting plate means, and the compression side of the discharge valve disc means all being adapted to lie substantially in the same plane at the apex of the compression stroke to essentially eliminate gas reexpansion.

Abstract: An improved heart valve prosthesis (20) suited for replacement of any of the four valves in the heart. The invention includes a generally annular orifice ring (22) having a fluid flow bore with a smooth inner wall (26) through which blood flows, controlled by two pivoted leaflet occluders (40), supported at the downstream edge of the orifice ring.The occluders are supported at the outboard edges of the orifice ring, overlapping the fluid flow bore and generally about each other to seal backflow and regulate flow in one direction only. Occluder travel is limited by bending moment resistance of the occluder hinge and lateral blood flow. Occluder hinges are unloaded at a point between fully opened and fully closed.The bearing surfaces between the occluder means and the annular orifice are wide enough to allow the valve to be constructed from materials of different hardnesses.

Abstract: A differential loading fluid check valve, including a unitized valve body having a single service port in its sidewall for selective access to the interior chamber of the check valve. Check valve subassemblies are installed and removed through the service port for valve assembly and service. The same valve body can be configured for either single or double check valve operation by adding or removing check valve subassemblies. Each check valve subassembly includes a base with an aperture, a pivotally mounted clapper, and an overlying pivotally mounted cam arm, spring biased against the movable end of the clapper. An arcuate surface on the cam arm is engaged by the clapper as it moves from a closed position to an open position, providing a beneficial differential reduction in the pressure drop, or loading, through the check valve.

Abstract: A hydropneumatic suspension system having at least one shock and vibration damper including a cylinder-piston unit (2) provided with a gas storer (34) co-acting with a damping valve (60) provided with choke valves (88, 90, 92, 94). The choke valves (88, 90, 92, 94) include valve elements (96) biased with springs (98) in a closing direction of the valve elements (96). The bias tension of the springs (98) is variable by a setting member (100) acting on these springs (98) in common in a closing or opening direction of the valve elements (96). A load-dependent adjustment of the damping can be achieved, as the setting member (100) is driven by the pressure present inside the gas storer (34).

Abstract: A back flow preventer and vacuum breaker for use with a plumbing fixture in which the discharge may be moved to a position within a body of water includes a body having an inlet and an outlet, a chamber connecting the inlet and outlet and an air vent opening into the chamber. There is a first diaphragm positioned within the chamber which controls air flow through the vent. There is a second diaphragm positioned in the chamber which controls flow from the inlet into the chamber and includes an integral check valve extending into the outlet.

Abstract: A water hydrant defines an elongated flow passage having a water inlet and an air inlet, and a laterally extending water outlet spout disposed therebetween to define an outlet. An elongated rotatable stem is reciprocated within the flow passage, and terminates in an exterior handle. A water inlet valve is connected to the stem for control of flow from the water inlet into the passage and an air valve is connected to the stem to control inflow of air and preclude outflow of water through the air inlet. A first check valve in the spout precludes backflow of water into the passage, movement of the air valve opening the first check valve during operation of the handle. A second check valve in the spout downsteam of the first check valve precludes backflow of water into the spout. A drain orifice, open to the atmosphere, extends through the spout between the check valves.

Abstract: A valve assembly is interposed between the cylinder body and the cylinder cover of a piston compressor in which a piston assembly is provided slidably in the cylinder body. The valve assembly has an inlet passage with an increased-diameter inlet chamber, and an outlet passage with an increased-diameter outlet chamber. When the piston assembly moves away from the valve assembly in a suction stroke, an inlet valve rests on the inlet projections in the inlet chamber so as to enable gas to flow into the cylinder body, while an outlet valve closes the outlet passage, so as to prevent gas from flowing out of the cylinder body. When the piston assembly moves toward the valve assembly in a compression stroke, the inlet valve closes the inlet passage so as to prevent gas from flowing into the cylinder body, while the outlet valve rests on the outlet projections in the outlet chamber so as to enable gas to flow from the cylinder body.

Abstract: A check valve, including an inlet housing portion and outlet housing portion which are adapted to be snap-fit together, is inexpensively and quickly produced using valve disks which are capable of providing variable fluid flow resistance. The valve disk is stamped from flexible materials having a Shore A durometer hardness in the range of from about thirty to about one hundred (e.g., a thermoplastic elastomer). Flat, circular shapes having at least three, arcuately-shaped windows defined therein, with an outer sealing periphery being joined to a circular closing member by webs which separate the windows, provide a valve disk of substantial manufacture ease.