Abstract: The valve assembly comprises a body formed of substantially identical, or identical plates, in which one is the mirror-image or reverse of the other. The plates are held apart, in parallel planes, by an enveloping seal. Each plate is ported for the conduct of fluid therethrough in cooperation with a fluid-conducting void formed in the confronting plate. Flapper-type valving elements are confined within the body, between the plates. A single, centrally-disposed fastener secures the plates and the assembly together, and constitutes the means for the simple disassembly of the unit.

Abstract: According to a method of preventing freezing in water piping there is arranged a non-return valve (3) upstream of the portion (1A) of the piping (1) which is to be protected, and a safety valve (4) downstream of this portion. The safety valve opens to allow the water to flow out and prevent freezing at a pressure increase of the water entrapped downstream of the non-return valve, the pressure increase occurring when the temperature falls from +4.degree. C. towards the freezing point. The invention also relates to a piping system for carrying out the method.

Abstract: A water reclamation apparatus for recycling water in a system including a reclamation tank for holding water to be recycled, a first conduit for conveying water to the reclamation tank, a second conduit for conveying water from the reclamation tank, an outlet hose extending from the second conduit to a point beneath the level of the water in the reclamation tank, the outlet hose including two check valves operatively connected in series to allow water to flow through the outlet hose from the reclamation tank, and to prevent water from flowing into the reclamation tank from the outlet hose under conditions where one of the check valves is held in an open position. The outlet hose is flexible and can be extended through an access portion of the reclamation tank to allow the check valves to be serviced.

Abstract: An improved liquid flow check valve using a ball and seat wherein the seat is made of sintered ceramic. The improved valve will operate in an environment of acetonitrile and water without sticking shut, thereby providing more stable liquid flow rates in liquid chromatography systems.

Abstract: An improved solvent handling system for use with a liquid chromatograph is disclosed in which a manifold allows a source of pressurized gas to communicate with a plurality of solvent vessels. Individual check valves prevent return flow into the manifold and cross flow between the solvent vessels. A pressure equalization system is also provided for equalizing the pressure between each solvent vessel and the corresponding supply conduit. An individually manually operated vent is provided for sparging and pressure release.

Abstract: A backflow preventer assembly is provided, which allows for connection of the assembly to the variety of water line configurations. The valve device is attached to at least one rotatable, sealing flange which is rotatable from an in-line configuration to an L-shaped configuration. A rotating sealing flange is provided at each of the inlet opening and outlet opening of the valve device. A stop valve is positioned in each of the rotating flanges.

Abstract: 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: A high pressure check valve assembly includes a ceramic cage loosely fitted into the bore of a body so as to leave at least a partial clearance between the cage and the body. A passage through the cage includes a retaining section adjacent a fluid inlet end for loosely containing a ball and an irregular cross-section adjacent the retaining section so as to obstruct the ball without hindering fluid flow forwardly through the passage. The cage further has a lateral bleed hole between the passage and the clearance to equalize fluid pressure. An outlet-end sealing member is press fitted into the bore against the outlet end of the cage. An oversized resilient washer-shaped inlet-end sealing member is press fitted into the bore against the inlet end of the cage to seal and retain the assembly. This member has a central aperture with a washer shaped seat member fitted therein, the seat member functioning with the ball as the check valve.

Abstract: A check valve for providing mono-directional flow in medical devices. The check valve includes a valving means comprised of a valve member and a seat member disposed within a cylindrical channel. The valve member is coaxially aligned within the channel downstream of the seat member and provides a valve cavity into which a portion of the seat member is disposed. The interface between the valve member and the seat member creates a seal length. The valve member is radially stressed by the axial position of the seat member so that the sealing force along the seal length is substantially radial. Fluid flow passes through an axial bore in the valve seat member and upon sufficient pressure unseats the seal length and passes through the annular passageway between the valve member and the seat member.

Abstract: A backflow preventer assembly for a liquid supply line includes a single unitary valve body including flanged inlet and outlet end openings and a single access opening generally normal to the flow path defined by the inlet and outlet openings. The body houses a pair of check valve seats on opposite sides of the access opening for seating a pair of check valves mounted in series to permit flow from the inlet opening to the outlet openings. Adjustable compression rods interconnecting the two check valves seat the valves against their oppositely facing valve seats. The check valves and compression rods are sized to enable installation and removal of the valves through the access opening. In one embodiment the valve body has a predetermined length for installation in the liquid supply line between a pair of gate valve assemblies, such length being the same as a standard body length for a single check valve assembly.

Abstract: The cardiac valve comprises an annular body, at one end of which there are pivoted valve members, adapted to operate as a closing element, the annular body consisting of an outer ring member and an inner ring member which are mutually coupled, one of the ring members defining the pivot seats of the valve members, whereas the other ring member is adapted to delimit these seats, in order to provide a stable pivoting coupling of the valve members to the annular body.

Abstract: Disclosed herein is a check valve assembly for use in high pressure pumps having a high pressure plunger reciprocating in a pressure chamber or for use in other pressure chambers wherein both fluid inlet check valve means and fluid outlet check valve means are provided adjacent to the pressure chamber. The check valve assembly of the present invention is especially suitable for use in high pressure pumps operating to produce fluid pressures in excess of 10,000 psi, and significantly increases the operating life of the check valve assembly by reducing the incidences of material fatigue caused by cyclic stresses due to cycling high and low pressures.

Abstract: An improved liquid flow check valve using a ball and seat wherein the seat is made of sintered ceramic. The improved valve will operate in an environment of acetonitrile and water without sticking shut, thereby providing more stable liquid flow rates in liquid chromatography systems.

Abstract: In a shuttle valve device, a device body is formed by a single block in order to simplify construction. The device body is formed with a communication passage extending straight. A plurality of fitting bores are intersected with the communication passage. Each fitting bore extends straight from an outer surface of the block toward the communication passage. The fitting bore is intersected with the communication passage and has a forward end portion extending beyond the communication passage. The forward end portion serves as a pressure introducing section. Shuttle valves are inserted respectively in the fitting bores so as to divide the communication passage into a plurality of sections. Each shuttle valve compares pressure introduced through the passage section on one side of the shuttle valve with pressure introduced through the forward end portion of the fitting bore, to select one of the pressures and to lead the selected pressure to the passage section on the other side of the shuttle valve.

Abstract: A check valve with a disposable filter is provided for regulating the flow of a mobilizing liquid in a pump of a liquid chromatograph. The valve assembly includes two seated ball valve subassemblies securely housed in a casing to define a liquid flow path therethrough. A portion of one valve subassembly extends beyond the valve casing and is received by a valve end cap. The valve end cap has an aperture which is aligned with the flow path defined by the valve subassemblies. The apertured end of the end cap has a tapered perimeter for receiving a correspondingly tapered end seal. The end seal has an apertured end wall with a filter received in the aperture and is adapted to be removably mounted on the tapered edge of the end cap, thereby removably mounting the filter to the valve assembly and requiring only the force of the user's fingers to attach and remove the filter.

Abstract: A one-way check valve for pressurized fluid is described which comprises the following elements: a cylindrical envelope (1) provided with a chamber (2) having a fluid inlet passage (3) at its base and a fluid outlet passage (4) at its top end, a mobile sphere (5) which moves inside the chamber (2), under the effect of the pressure exerted by the fluid, from a closed position to an open position or vice-versa, and a ring (6) firmly fixed to the base of the envelope (1) and serving as a seat for the mobile sphere (5) in the closed position, the upper part (7) of the ring (6) being shaped so as to present a spherical or conical contact surface (8), the upper part of the chamber (2) having stops (9) separated by passages (10) leading into the fluid outlet passage (4), the lower part of each of the stops (9) being shaped so as to present a spherical or conical contact surface (11), and the mobile sphere (5) being retained by the said stops (9) in the open position, and the envelope (1), the mobile sphere (5) and t

Abstract: A frozen comestible freezer with a freezing chamber, a receiving chamber, and a tank of liquid comestible fed to the receiving chamber through an aerator proportioner which provides the correct proportion of liquid comestible and air for the freezing chamber. The aerator proportioner further contains means for isolating pressure exerted by the comestible product in the chamber from the combined pressures exerted by the liquid comestible and atmospheric pressure of air admitted into the receiving chamber, and thereby minimize backflow concerns brought about by pressure imbalance.

Abstract: An automatic switching valve mounted between two fluctuating pressure sources automatically switches from one source to the other to supply gas or liquid from the source that is under the higher pressure. A T- housing conveys gas or liquid from either side and out of the central stem. Tapered, spring loaded plugs or valves in either side engage with tapered seats and are maintained in contact with the seats by springs which permit one or the other valve to open when the pressure on one valve exceeds the tension of the spring of the other valve. If the pressure is equal on both sides, both valves will open simultaneously if pressure is greater than cracking pressure.

Abstract: A gas-inflatable bladder toy is disclosed, in which a plurality of films are stacked with their peripheral edges being sealed for forming a bladder to be inflated by filling a required pressure gas therein, said bladder being adapted to be fed with an external gas and provided with an air valve in a flat double cylindrical form for checking an internal gas, or alternatively in which the same construction of the bladder contains a plurality of receiving bags separately receiving certain foaming agents which are chemically reacted upon mixing to produce a gas, these filling bags being broken by an external force. In accordance with the gas-inflatable bladder toy of the invention, the shape of the receiving body containing the preexpanded bladder 1 may be quite different from the shape of the expanded bladder 1 after opening the receiving body 7 and expanding to the given shape, thereby to provide an exciting bladder toy with a surprising effect.

Abstract: A valve assembly for use with air treatment apparatus is disclosed. The assembly includes shutter valves disposed in the air flow channels and actuatable by the flow of air therethrough.

Abstract: An ink jet recording apparatus has a recording head for discharging ink and effecting recording, a recording flow path communicating the recording head with one end of a first ink tank, a pump side flow path communicating the first ink tank with the recording head through a pump and, together with the recording flow path, constituting an ink circulation path through the head and the first ink tank, and a secnd ink tank for supplying ink to the first ink tank. Normally open electrical opening-closing means (FIG. 11) are provided in the recording flow path and in a tube for opening the first ink tank to atmosphere. Another normally open electrical opening-closing means and a check valve permitting the passage of ink from the pump only to the recording head, this latter opening-closing means and the check valve being interposed in series in the pump side flow path between the pump and the recording head. The apparatus also may include an overflow sensor (FIGS.

Abstract: An aspiration assembly having dual co-axial check valves for pumping medical fluids with a hypodermic syringe, the assembly having a main body with two passageways in offset relationship to each other, with the passageways coming together at a large central cavity within the main body, a central support structure mounted within the central cavity of the main body, a pair of flexible resilient valve disks engaged by the central support structure, and a body cap having an outlet passageway therein for complementarily enclosing the central cavity of the main body and for retaining the central support structure and dual valve disk in co-axial relationship.

Abstract: A BWR fuel assembly includes a bundle of elongated fuel rods disposed in side-by-side relationship so as to form an array of spaced fuel rods, an outer tubular flow channel surrounding the fuel rods so as to direct flow of coolant-moderator fluid along the fuel rods, and bottom and top nozzles mounted at opposite ends of the flow channel and having an inlet and outlet respectively for allowing entry and exit of coolant fluid into and from the flow channel and along the fuel rods contained therein. The BWR fuel assembly includes an improvement in the form of a coolant flow direction control device mounted in the bottom nozzle of the fuel assembly and being operable to open the inlet thereof to flow of coolant fluid in an inflow direction into the flow channel through the bottom nozzle inlet but close the inlet to flow of coolant fluid from the channel through the bottom nozzle inlet upon reversal of coolant liquid flow from the inflow direction.

Abstract: A water distribution system for directing water flow between a live well in a fishing boat and a water source, such as a lake. The water distribution system includes a flow directing valve which has two operating conditions. In the first operating condition a plurality of check valves automatically direct the water flow to selectively keep the live well empty or to empty water from the live well. In a second operating condition the valve enables the selective filling of the live well, the maintenance of the water level in the live well and the recirculation of the water along with the input of fresh water to the live well. In the second operating condition these functions are carried out automatically without operator intervention, regardless of whether the boat is stationary or moving.

Abstract: A fluid-containing power unit mounting device capable of effectively damping vibration in a wide range of frequency is shown. The damping function of the device is accomplished by a mounting rubber forming an internal fluid-containing chamber between a power unit and a chassis, a partition plate dividing the chamber and including a plurality of valve mechansims in series and an orifice communicating between both sides of the chamber.

Abstract: A pressure relief device 5 for a vessel having redundant pressure relief capabilities. An annular plate 12 overlies a surface 11 which has an aperature to the vessel. A seal is formed between the surface 11 and annular plate 12. A solid plate 13 overlies the annular plate 12. A seal is formed between the solid plate 13 and annular plate 12. The relief device 5 will open at a first predetermined pressure by lifting the solid plate 13. In the event the seal between solid plate 13 and annular plate 12 should stick the relief device 5 will open at a second slightly higher, predetermined pressure by lifting the annular plate 12 and solid plate 13 together. Hinging means 6 are provided to reclose the pressure relief device 5 when conditions return to normal.

Abstract: A telescopic hydraulic shock absorber including a base valve assembly having a valve body with three arcuate slots which lie between two concentric valve seats which are overlain by a flat annulus constituting a recuperation valve. This valve is normally held in contact with the valve seats by a recuperation valve spring. A passage of complex shape extends through the center of the valve body and the mouth of the passage at the lower end is surrounded by an annular valve seat. A compression valve pin with a shank cooperates with the valve seat to form a compression valve and the shank is guided in a valve guide located in a counterbore in the aperture. The valve guide comprises a solid ring portion having six integral projections. There is an annular clearance between the valve pin and the part of the passage which is in communication with an annular space between the ring portion and the part of the passage through the passageways between the projections of the valve guide.

Abstract: Pressure fluid operated servo system method and apparatus including a servo valve operable by an input signal to effect a system output movement; and which servo valve is responsive to the time rate of input signal receipt to vary a gain ratio of system output magnitude compared to input signal value; and method of making such a servo valve.

Abstract: A remotely controllable adjustable-stroke fluid cylinder system is described in various embodiments. The system includes a floating stop piston (48) and a main piston (24,224) which is controlled by a valving system (70) and which has visual indicator means having a graduated scale (69,169).

Abstract: A valve assembly for use in for example a stirrup pump. The valve assembly has a body defining a bore into which a carrier is inserted. The carrier defines a tubular passageway with a pair of O-rings spaced apart along the length of that passageway. The passageway is of substantially uniform internal diameter and the O-rings are received in annular grooves formed in the inside surface of the passageway. Two balls are provided each associated with one of the O-rings and an inlet port is provided which communicates with the space in the passageway between the O-rings. The application of an excess pressure to the port drives fluid from the port through one of the O-rings whereas the application of a reduced pressure to the port draws fluid through the other O-ring to the port.

Abstract: A valve assembly for relieving intracraneal pressure includes a valve housing adapted for implantation and having an inlet port for connection to a ventricular catheter and an outlet port for connection to a venus or peritoneal catheter. The valve housing includes a fluid passage, the flow through which is controlled by a first pressure responsive valve of relatively high resistence and a second pressure responsive valve of relatively low resistence spaced downstream of said first pressure responsive valve. An attitude responsive valve is disposed in said fluid passage in parallel with said first pressure responsive valve. The valve assembly is implanted in a patient with the attitude responsive valve in a closed position when the patient is in an upright position and in an open position when the patient is in a horizontal position. The employment of pressure responsive and attitude responsive valves in parallel provides ventricular pressure relief regardless of the patient's position.

Abstract: A water meter service installation including both a water meter and a backflow protection device, both utilizing the same water meter box. The present installation can be retrofitted to existing meter boxes in the field as an elongated tubular extension is detachably connected to the water meter box in alignment with an opening therein, the extension extending therefrom and being capable of housing a cartridge insert member telescopingly positioned therein, the cartridge insert member having a pair of check valves in series to prevent backflow of water through the meter. By utilizing the tubular extension bolted to the exterior of the meter box, very little, if any area is taken up within the meter box and, thus, an existing meter box can still accommodate the conventional water meter while being provided with a backflow protection device in the form of a double valve cartridge insert.

Abstract: A check valve for cardiac surgery and the like has a hollow valve body supporting spring biased split leaflets hinged for swinging movement from the base thereof between normally closed position and open position wherein the leaflets form a continuation of one end of the hollow annular valve body. Out turned edges of the separable spring biased split leaflets are in sealed engagement with a seat on the valve body and terminate in longitudinal edges which are in sealed engagement with adjacent leaflet sealing edges in the normally closed position. Said longitudinal out turned edges provide braking action to slow the closing velocity of te leaflets during the closing portion of their cycle. Said longitudinal out turned edges are shaped to provide a cushioning effect at the instant of closure due to their resiliency and springiness thereby minimizing closing impact and blood cell damage.

Abstract: A system for controlling the flow of liquid between a reservoir and a liquid source. Passageways are provided between the reservoir and the source for the flow of liquid therebetween. Selectively operable valves, including automatic check valves, are disclosed in various forms of the invention for actuation between a first position for filling the reservoir with liquid from the source and a second position for emptying liquid from the reservoir to the source. The automatic valves prevent the flow of liquid from the reservoir to the source when in the first, filling position and allow the flow of liquid from the reservoir to the source when in the second, emptying position.

Abstract: A disposable mouth to mouth resuscitation device includes a one way valve for preventing the victim's breath, saliva, mucus or disease agents from contact with the resuscitator's mouth or respiratory tract. The one way valve is in a plastic body from which extends a curved airway tube for placing in the victim's mouth. At the other end of the plastic body is a flexible tube leading to a mouth piece at its opposing end, for insertion into the mouth of the resuscitator. A mouth and nose mask is connected to the plastic body, adjacent to the curved airway tube, for sealing over the nose and mouth of the victim during resuscitation. When the victim exhales, his breath and other exhaled materials are exhausted through a side port in the plastic body and into the atmosphere.

Abstract: An improved safety valve for a feeding water machine, comprising a first casing having an inlet and an outlet, a spring-loaded sliding member slidably mounted into the first casing, a spring-loaded steel ball mounted into the spring-loaded sliding member, a ring mounted into the sliding member to confine the spring-loaded steel ball, a supporting member abutting against the ring, a second casing fixedly attached to the first casing, a stem threadedly engaged with the second casing in such a manner that it may be screwed into or out of the second casing, a push member fastened to the end of the stem, a spring located against the push member at one end and provided with a spring shoe at the other end, a sliding rod disposed against the spring shoe and contacting a second steel ball at the other end, and a spacer mounted between the first casing and the second casing.

Abstract: A housing is divided into two chambers. A tube connects the two chambers. The end of the tube forms a valve seat on each end. The valve seat in one chamber angles upward and the valve seat in the opposite chamber angles downward. A flapper valve is attached above the top of the valve seat which angles upward, and at the bottom of the valve seat which angles downward. Gravity acting upon the flapper valves will hold one in the open position and the other in the closed position unless it is opened by a flow of fluid. Turning the housing upside down will reverse the position of the flapper valves so that the permitted fluid flow will be reversed.

Abstract: A manifold is described, for delivery of radioaerosol to a patient, having a pair of rigid conduits joined at one end to form a first connector and at the other end to form a second connector. A third connector is formed in the first conduit between the first and second connectors and a one way-valve is located between the first and third connector. A second one-way valve is located in the second conduit to permit exhalation by the patient.

Abstract: An ignition plug provided with a tubular center electrode through which open air is introduced into the engine cylinder to accelerate exhaust of the combustion gas from the cylinder in the exhaust stroke of an engine cycle. The tubular electrode has a double-check valve fitted therein to prevent leakage of the high-pressure gas from the cylinder when the cylinder pressure is above the ambient pressure. The valve is composed of two differently-weighted floats serially disposed in the center electrode, one of the floats being in operative position even if the other resonates with engine vibration.

Abstract: An air controlled valve assembly for a lumbar support device of the type having a plurality of parallel, horizontally disposed air bags located in the seat back of an automobile seat includes a hollow housing having a main air distribution chamber therein and a plurality of individual air supply chambers each of which is adapted to be connected to a respective air bag. A check valve is associated with each individual air supply chamber to control the flow of air under pressure from the main air distribution chamber to the respective air bags. The check valve is adapted to be spring biased into normally closed position against a valve seat and a spring guide member is interposed between the spring and the check valve. The spring guide member is formed with a plurality of radially extending circumferentially spaced apart projections, each of which has a partial circumferential surface adapted to be in sliding engagement with a hollow cylindrical bore.

Abstract: An anti-syphon, frost-proof hydrant including a lower body having a fluid inlet, and a fluid outlet defined therein, with a valve seat provided within the outlet where standpipe enclosure member is provided and adapted to be secured to the lower body around the valve seat, to provide a fluid conduit, having and outlet end connected to an upper body having a fluid inlet communicating with the standpipe outlet and a fluid outlet, a valve operator carried by the upper body including a stem member extending downwardly through the upper member and the standpipe and adapted to carry a valve member on the end thereof disposed in aligned relation with the valve seat so the valve member outlet is open and closed by movement of the stem member and where an anti-syphon drain port is provided in the lower body member and adapted to receive an anti-syphon drain device including an enclosure defining a chamber, and adapted to be received in the port, where valve seat means are disposed within the chamber with valve means o

Abstract: Prosthetic valve means for use in heart surgery includes a retainer ring member designed to be attached to portions of a living heart. Leaflet means are supported for hinging movement in the retainer ring to simulate the movement of heart flaps in a human heart. The retainer ring means has inner peripheral wall portions removed to form spaced apart apertures in which occur hinging sockets for receiving hinging stud portions of the leaflet means. The spaced apart apertures are further characterized by upper and lower stop edges against which the leaflets may seat in an alternating manner and the stud portions are freely supported in respective sockets to provide for floating a leaflet in the paths of travel of a flow of blood during the systolic and diastolic functioning of a human heart.

Abstract: Insulin delivery system comprises insulin reservoir, pump and subcutaneous needle. Pump is electromechanically-driven at a preselectable fixed rate and can be additionally actuated to deliver a preprandial bolus of selected dosage.

Abstract: A mixing block, for attachment to a combustion chamber in which a solid body or material is briefly subjected to high temperature and pressure by the detonation of an explosive gas mixture, is composed of three block-like parts clamped together by screws. This enables the relatively long channels subject to explosion stresses to be constituted of lengthwise bores in the middle block connected by milled short cross-connections. The protective cutoff valve is an automobile type valve set in the upper block piece, which can also have an insert of temperature resistant material adjacent to the mixing chamber portion of the middle block. The ignition device is not shown in the drawing, but is usually provided in the mixing block structure. In the section of the mixing block illustrated in the drawing only one of the gas connections to the mixing chamber (19) is shown.

Abstract: Fluid control apparatus including inlet and outlet check valve assemblies connected to a mounting block, filter means operatively associated with the check valve assemblies and a pulse damper device positioned on the mounting block for maintaining a continuous pressure on fluid after it has passed through the check valve assemblies.

Abstract: An air deflection duct assembly is disclosed for use in adding an evaporative cooler unit to an existing refrigeration air conditioning duct to increase the efficiency of operation of the evaporative cooler by causing a higher percentage of the air flow from the cooler to pass into and through the existing refrigeration ducts. To accomplish this, first and second spaced apart duct assemblies are mounted over holes cut into the existing refrigeration air conditioning duct system. Each duct assembly has an adapter plate constructed with a circular hole in it, and this hole is normally closed by a pressure-opened deflector hinged at one edge of the hole. The hinged edges of the deflectors are mounted facing one another. When air is passed into the collar of the assembly extending upward from the hole from the evaporative cooler, the deflector plates open and extend at an angle into the existing refrigeration duct to deflect the air in opposite directions from the space between the openings cut in the duct.

Abstract: A locking device to keep two spaced apart positionable heads in place. The disclosed locking device can keep two hex shaped adjustable relief valve heads (34,44) in place. The locking device (10) is punched out of a flat thin sheet metal plate. An elongated opening (12) punched out in the plate has a length (14) which is greater than the furthest separation of the two adjustable heads (34,44). The in flat width (16) of the elongated opening (12) in the sheet metal plate is large enough to fit over the adjustable heads. During use, the plate is bent to decrease the effective width of the opening (12) so that it is smaller than the associated adjustable heads. The locking device (10) is then forced over the two heads (34,44) to engage a flat portion thereof and prevent relative movement.

Abstract: A ball check valve having a body with a through passageway having an internally restrictive frustoconical seat is provided with a frustoconical metallic backup member having a different cone angle than the seat and a large diameter ball having a maximum diameter greater than the maximum diameter of the backup member, the backup member having a contoured large diameter axial end face for receipt of a portion of the ball such that a seal is provided between the seat and the ball and between the backup member and the seat and means urging the ball against the backup member large diameter axial end and the backup member against the seat.

Abstract: A check valve assembly employs a poppet slidably mounted in a stationary barrel to engage a seat in the barrel. The poppet and barrel cooperate to form a closed chamber containing a spring which acts to close the poppet against the seat, but the force of the spring is partially overcome by a reduction in pressure in the chamber caused by venturi action by forward flow through the check valve assembly with the result that higher upstream pressure is needed to open the valve than to maintain it in open position, at least for low and medium flow rates. Two identical check valve assemblies are connected in series, the assemblies being perpendicular to each other, each mounted at about a 45.degree. angle with respect to coaxial inlet and outlet terminals.

Abstract: A manually operated dispensing device for a container holding a quantity of liquid is disclosed. The device has an internal chamber and a flexible, elastomeric diaphragm-like cover on at least one side of the chamber in a component retaining body. Associated inlet and outlet valves, which valves may be discrete or integral with the diaphragm and body, and conduits are included whereby liquid from a supply thereof in the container is drawn up into the chamber when the diaphragm is flexed under stress. The diaphragm is operatively associated with a trigger device, the actuation of which flexes and stresses the diaphragm in a direction to decrease the chamber volume. Liquid which is present in the chamber is displaced and pressurized in a pumping action, forcing the outlet or discharge valve to open and the inlet valve to close allowing the liquid to flow into the outlet or discharge conduit and be dispensed from the device.