Abstract: A valve assembly for a pumping apparatus includes a cylinder sleeve having a head end with inlet and outlet ports surrounded by a recess. An elastomer seal element is received in the recess and includes a peripheral portion that encircles the ports and a bridge portion that extends across the space between the ports. Integral flapper valves extend into the spaces between the peripheral portion and the bridge portion. A valve head with inlet and exhaust chambers has a flat surface that seats against the seal element. The cross-section of the peripheral and bridge portions are compressible, such as that of an O-ring.

Abstract: A pumping device including a common pumping diaphragm with two stop valves each of which are equipped with a valve closing member that alternately assumes an open position and a closed position during the pumping operation. The pumping device according to the invention is provided for a fuel evaporation inhibiting system of an internal combustion engine.

Abstract: An integral valve diaphragm pump has a first rigid layer, a second rigid layer and a flexible membrane therebetween. Concave surfaces in the two rigid layers form a pump. The pump includes an actuating chamber which is alternately connected to a source of pressure and a source of vacuum. A pump chamber is connected to a fluid source and a fluid receiver through a filling check valve and a dispensing check valve, respectively. Duckbill and spring loaded ball check valves are disclosed.

Abstract: A pump comprising a housing including first and second housing sections and a gasket between the first and second housing sections. The housing has a first pumping chamber, an inlet, an inlet passage in the housing leading from the inlet to the pumping chamber, an outlet and an outlet passage in the housing leading from the pumping chamber to the outlet. A pumping member is movable in the pumping chamber to pump fluid through the pump. Inlet and outlet check valves are provided in the inlet and outlet passages, respectively with each of the check valves including a movable valve element. The outlet check valve includes an outlet valve seat and a movable outlet valve element secured to the gasket at at least two spaced apart regions.

Abstract: New valves to allow or prevent material flow through a conduit are disclosed. Such valves comprise a valve seat having a longitudinal axis, defining a through opening and including a seating surface which defines a portion of the through opening. A valve body, operatively coupled to the valve seat, is located at least partially in the through opening. A valve element is secured to and movable relative to the valve body. The valve element includes a sealing surface which is curved in at least one plane parallel to and including the longitudinal axis of the valve seat and is adapted to contact the seating surface to prevent material flow through the through opening. Pump assemblies and condiment dispensing systems employing such valves are also disclosed.

Abstract: A double acting, fluid actuated pump is disclosed. The pump includes a pair of diaphragms interconnected by a piston. Each diaphragm is formed of resilient material and comprises a central portion for attachment to the piston, a peripheral portion for attachment to a surrounding housing and an intermediate conical portion extending between the central portion and the peripheral portion. A first hinge merges the intermediate portion with the central portion. A second hinge merges the intermediate portion with the peripheral portion. Each hinge comprises an annular protuberance extending out of an extension of the cone of the intermediate portion such that a portion of the first hinge and a corresponding portion of the second hinge project from opposite sides of the cone to provide a reliable, fatigue resistant, diaphragm. Valving for the pump is also disclosed.

Abstract: The head, rolling diaphragm, intake and discharge ports form a single module, separate and easily removable from the principle cylinder of a rolling diaphragm filling unit. The rolling diaphragm may be fixed or removably attached to the head. Intake and discharge valves of various types may be mounted directly in the head, or may be mounted remote to the head module and fluidly connected directly to the head by tubing. Flanges of the rolling diaphragm provide an air and liquid tight seal between the head and base and removably attached to the head so as to facilitate visual inspection of the product contact surfaces of the head cavity prior to clamping the head module to the base.

Abstract: A reciprocal type of pump structure wherein a piston has a linear function actuated by a pair of coils energized alternately and includes a plurality of tapered flutes. A check valve in an outlet of the structure which stretches to open said outlet under the impact of expelled fluids and of its own volition retracts to the closed position immediately upon the cessation of fluids being expelled.

Abstract: A pump comprising a housing including first and second housing sections and a gasket between the first and second housing sections. The housing has a first pumping chamber, an inlet, an inlet passage in the housing leading from the inlet to the pumping chamber, an outlet and an outlet passage in the housing leading from the pumping chamber to the outlet. A pumping member is movable in the pumping chamber to pump fluid through the pump. Inlet and outlet check valves are provided in the inlet and outlet passages, respectively with each of the check valves including a movable valve element. The gasket forms a seal between the first and second housing sections and includes at least one of the valve elements for the check valves.

Abstract: An air pump piston is provided peripherally with a first leakproof ring and a second leakproof ring, which are located respectively and contiguously at both ends of the piston. Located peripherally between the first and the second leakproof rings is a radially disposed air hole. The piston is fastened at the second end thereof with a piston rod such that the air hole of the piston is in communication with an axial passageway of the piston rod. The piston is further provided peripherally between the first leakproof ring and the air hole with at least one first duct disposed radially. The piston is still further provided peripherally with at least one second duct which is disposed radially and located between the second leakproof ring and the air hole. The piston is provided at the first end thereof with an air admitting hole in communication with the first duct. The piston is provided at the second end thereof with an air duct in communication with the second duct.

Abstract: A container-mounted dispensing pump incorporates elastomeric duckbill valves for controlling the flow into and from the pump chamber. A mechanism within the pump employs hinged leaves which cooperate with the pump plunger to effect a pinching and closing one of the duckbill valves when the plunger is disposed in a depressed, shipping position. With the pump plunger held in the shipping position, the closed duckbill valve will preclude leakage of the container contents through the pump.

Abstract: Chemical pumps are disclosed in which all parts wetted by the fluid being pumped are made of fluoroplastic material, with the pumps having check valves that include floating ball members and O-rings positioned adjacent to the floating ball members. The retainer area in which the O-ring is received has a diameter that is at least about 0.01 inch larger that the diameter of the O-ring so as to allow the O-ring to move slightly. The intake and discharge ports of the pumps comprise a bore extending into the body of the pump, with a threaded counterbore formed concentric with the bore to form a flat, annular surface between the bore and the counterbore at the inner end of the counterbore. A threaded fitting is received in the counterbore, and a seal is formed by compressing an O-ring against the annular surface at the inner end of the counterbore.

Abstract: New valves to allow or prevent material flow through a conduit are disclosed. Such valves comprise a valve seat having a longitudinal axis, defining a through opening and including a seating surface which defines a portion of the through opening. A valve body, operatively coupled to the valve seat, is located at least partially in the through opening. A valve element is secured to and movable relative to the valve body. The valve element includes a sealing surface which is curved in at least one plane parallel to and including the longitudinal axis of the valve seat and is adapted to contact the seating surface to prevent material flow through the through opening. Pump assemblies and condiment dispensing systems employing such valves are also disclosed.

Abstract: A check valve for disposable pressure infusion systems having an inflation bulb with a single open end includes a valve body with a pair of intake ports and a discharge port. Disposed at such single open end of the inflation bulb, one of the intake ports permits a flow of pressurizing air from the inflation bulb when squeezed to a pressure cuff through flexible tubing coupled to the discharge port. A flexible diaphragm having slitted openings is disposed within the check valve which provides for opening and closure of a specific port alternatively during squeezes and release of the inflation bulb.

Abstract: A diaphragm pump has a first fluid-operated valve which opens when the diaphragm performs a suction stroke and a second fluid-operated valve which opens when the diaphragm performs a compression stroke. The volumetric efficiency of the pump is enhanced by constructing at least one of its valves in such a way that the central portion of a resilient disc-shaped valving element, whose marginal portion bears against a seat when the valve is closed, abuts a supporting surface having a diameter selected in dependency on the diameter of the valving element, the thickness of the valving element and the Shore hardness of the material of the valving element in such a way that the selected frequency of the diaphragm in actual use of the pump induces a resonant frequency of the valving element. This also contributes to a reduction of noise and renders it possible to reduce wear upon the valving element and the adjacent parts of the respective valve.

Abstract: A fluid end for use in high-pressure, reciprocating, fluid pumps has a cylinder with a bore therethrough in which a plunger reciprocates. A valve body is disposed at one end of the bore and includes suction valve seat and a discharge valve seat, which are substantially coaxial with the axis of the bore in the cylinder. The suction and discharge valves include elastomeric, abrasion-resistant seal members. The valve body is provided with at least one fluid flow passage positioned about the periphery of the suction valve seat to permit purging of entrapped gas from the pressure chamber defined in the cylinder bore between the plunger and the valve body. In a preferred embodiment of the present invention the suction and discharge valves are identical and interchangeable, and the valves are provided with urethane seal members to increase the abrasion resistance of the valves.

Abstract: The present invention is directed to an improved valved discharge mechanism of a refrigerant compressor. The compressor includes a compressor housing having at least one chamber in which successive strokes of sucking, compressing, and discharging a refrigerant gas is repeatedly performed. The chamber is linked to an outside chamber through a conduit formed in the compressor housing. A valved discharge mechanism is disposed at one end opening of the conduit which opens to the outside chamber. The valved discharge mechanism includes a discharge reed valve which by means of a bending movement blocks and opens the one end opening of the conduit. The discharge reed valve has a predetermined value of elastic modulus which allows the discharge reed valve to keep blocking the one end opening of the conduit until the pressure in the chamber reaches a predetermined value.

Abstract: A medical pumping system has a supply tube (2), an outlet tube (6), a readily sterilizable, disposable cassette (3) connected to the tubes and engaged with the pump, and means (22,24) such as a motor-driven piston, for intermittently applying pressure to the cassette. The pumping system features a display and switch means (9, 10) on a front panel thereof, a pressure sensor (28), an optical fluid presence sensor (19), and a microprocessor (20) metering the volume of fluid pumped through said cassette (3), monitoring output signals from said sensors (18, 28), controlling the motor-driven piston in accordance with settings entered via said switch means (9,10), and directing output data to said display means (8). The microprocessor has a stored program for performing SET RATE, RUN, HOLD, VOLUME FED, and CLEAR VOLUME functions.

Abstract: The present invention is directed to an improved valved discharge mechanism of a refrigerant compressor. The compressor includes a compressor housing having at least one chamber in which successive strokes of sucking, compressing, and discharging a refrigerant gas is repeatedly performed. The chamber is linked to an outside chamber through a conduit formed in the compressor housing. A valved discharge mechanism is disposed at one end opening of the conduit which opens to the outside chamber. The valved discharge mechanism includes a discharge reed valve which by means of a bending movement blocks and opens the one end opening of the conduit. The discharge reed valve has a predetermined value of elastic modulus which allows the discharge reed valve to keep blocking the one end opening of the conduit until the pressure in the chamber reaches a predetermined value.

Abstract: In a high volumetric efficiency compression machine that can be used as a compressor, pump, or actuator, a compression chamber is formed by a movable body and the inner wall of a casing. A discharge valve is formed in the casing, and communicates with the compression chamber. Two intake valves are formed in the casing, communicate with the compression chamber and are arranged symmetrically with respect to the axial direction of the discharge valve. A rod transmits reciprocation to the movable body.

Abstract: An improve the pump including a reciprocal piston pump having a pump piston, guided longitudinally displaceable in a displacement chamber. An outlet valve for the admission of pressure means and a valve for the outflow of pressure means is associated with the displacement chamber. The outlet valve is embodied as a cup-shaped sleeve, having on the outflow side a sealing lip of an elastomeric material, which cooperates with a cylindrical sealing face. The outlet valve is distinguished by low opening pressure, reduced noise when closing and reduced machining effort. The reciprocating piston pump (10) is intended for use in hydraulic brake installations of motor vehicles with ABS systems.

Abstract: A reed valve for a hermetic compressor, comprising a cylinder block (1) having a pair of opposite faces; a cylinder (C) formed in said cylinder block (1) and housing a piston (2); at least one end plate (3) having an outer face (3a) and an inner face (3b) fixed to one of the opposite faces of the cylinder block (1), in order to close a respective end of the cylinder (C), and being provided with at least one pair of axial gas passages (6, 7) communicating the interior of the cylinder (C) with the outer face (3a) of the end plate (3) through a respective read valve (10), which is fixed to the face (3a) of the end plate (3), to which is opened the outlet end (6b, 7b) of the respective gas passage (6, 7), said valve comprising a blade element (10) with a body being formed of a resin that is preferably plastic and reinforced with fiber filaments (20, 21, 22) spaced from each other according to at least one direction relative to the longitudinal axis of the blade element (10).

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: A small and compact vacuum-pressure pump which serves as a portable vacuum-pressure source is disclosed. The pump includes a cylinder coupled with one handle and a piston therein coupled with another handle. A valving means with a rotatable in a cylinder allows either a vacuum or pressure to be created at a port to the valving means. The valving means which is located ahead of an inlet valve to the cylinder can adapt a preexisting vacuum pump to operate either as a vacuum pump or a pressure pump as required.

Abstract: A steam iron having a pump mechanism (14) comprising a piston (15), a piston chamber (16) in which the piston is capable of moving, inlet and outlet ports (17,19) for the piston chamber, a return spring (31) and a control member for moving the piston in the opposite direction so as to pump water. To obtain a simple pump mechanism in the piston chamber (16) a cup-shaped valve member (22) of a resilient material includes a delivery valve (24) formed by two flexible wall portions (25, 26) of the valve member, the wall portions separating in the event of overpressure in the piston chamber so as to form a slitted aperture (27), the valve member further having a flexible wall portion (28) which flexibly bears against a wall (29) of the piston chamber and acts as a suction valve. The pump mechanism is preferably located in the steam needle with the object of pumping an extra quantity of water to the steam chamber (steam surge).

Abstract: A silicon micromechanical non-reverse valve. In a main surface of a silicon wafer there is provided a cavity and a cantilever beam. The beam extends over the cavity and is integrally formed with the wafer at its top portion. The beam is provided at a distance above the bottom wall of the cavity. A second wafer of silicon or glass is provided over the first silicon wafer and covers the cavity in order to form a chamber. A second wafer is provided with two openings one of which is situated within the outline of the beam and the other of which is situated outside said outline. The first opening acts as an inlet and the second opening as an outlet for the valve.

Abstract: A valve plate for a motor compressor has a continuously smooth figure-eight shaped port for reducing stresses along the primary longitudinal axis of a reed valve associated with the port, and an arrangement for providing a mechanical interlock for a head gasket to inhibit pressure loss between adjacent compressor cylinders.

Abstract: A readily sterilizable, disposable cassette (3) can be used in a medical pumping system having a supply tube (2), an outlet tube (6) and means (22,24), such as a motor-driven piston, for intermittently applying pressure to the cassette. The cassette features a hydraulically self-actuating inlet valve (44) communicating with the supply tube (2), a hydraulically self-actuating outlet check valve (42) communicating with, and preventing backflow from, the outlet tube (6), a hollow, resilient compressible member, such as a bellows (34), having an interior communicating with the inlet and outlet valves, and a support structure (30,36,38) securing together the tubes, valves and bellows in operating relation. Preferably, the inlet and outlet valves are a unitary element. An optical sensing system detects fluid exhaustion in the cassette. The cassette has an irregularly-shaped cap (38) which prevents incorrect insertion into a pump.

Abstract: A pump has a solenoid with an armature directly connected to an elastomeric diaphragm. Upon flow of half wave rectified ac current in the solenoid, the armature oscillates the diaphragm. A valve holder has duck-bill type inlet and outlet valves received therein. The valve holder is retained between a valve body and an armature guide member by fastening means which simultaneously effect sealing of the diaphragm rim and the rims of the duck-bill valves. The armature has portions thereof directly engaging a detent recess formed in a central buffer portion of the diaphragm.

Abstract: A pneumatic system (10) is shown in its most preferred use in a spray gun (12) to remotely control a pressure washer. The system (10) generally includes an integrally formed, homogeneous squeeze box (40) including a location ear (52), a nose tube (46), a bellows (44) and a discharge tube (48). Bellows (44) is generally rectangular in cross section and includes a flat top (62) and bottom (63) and accordion sides (64) having generally longitudinal fold lines (72, 74, 76, 78, 80) which are generally parallel to the mold part line (93) and the tubes (46, 48) but include a 2.degree. draft for ease in mold removal. A valve and spring tube (42) is loosely received on the nose tube (46) for sealing a vent hole (60) provided therein when the bellows (44) is compressed by a trigger (30) of gun (12) and for biasing the trigger (30) to an uncompressed bellows condition.

Abstract: A valve assembly (16) for an oscillating pump (10) of the type having a reciprocating armature (12) which carries an impeller (13) includes a rigid valve seat (17) carried by and movable with the impeller (13). The assembly (16) also includes an elastomeric valve (18) which is carried by the valve seat (17) within the impeller (13) and which divides the pump chamber therein into an inlet side (14) and outlet side (15). Reciprocation of the armature (12) first causes the valve (18) to engage the valve seat (17) to discharge fluid from the outlet side (15) of the pump chamber and then causes the valve (18) to disengage the valve seat (17) to permit fluid to pass from the inlet side (14) to the outlet side (15) of the pump chamber.

Abstract: A submersible well pump of the barrel and piston type characterized by a valve chamber formed coextensively with the barrel and containing an inlet valve and an outlet valves arranged to admit fluid to one end of the barrel on a first stroke of an unported piston and to discharge the fluid from the same end of the barrel on a second opposite stroke of the piston. A double acting version of the pump is also disclosed.

Abstract: A vibratory pump comprises a skeleton composed by an interior part and an exterior part interlinked by a connection with a movable static bobbin covered with resin that acts on a main membrane that in cooperation with a skeleton delimits a variable volume repression chamber communication with the exterior part through an admission central valve and also acts with a repression duct.

Abstract: A small and compact vacuum pump which serves as a postable vacuum source is disclosed. The pump includes a cylinder coupled with one handle and a piston therein coupled with another handle, along with a wafer valve assembly for allowing a vacuum to be drawn at an inlet of the pump. A previous version of the pump is improved upon by the use of different valve assemblies, to produce a more reliable, more easily assembled and less expensive vacuum pump. A vacuum release mechanism is provided operable with a finger of the hand about the handle.

Abstract: A small-sized pump comprising a common valve chamber, a plural number of pump chambers respectively arranged round the common valve chamber and each having a diaphragm, a drive member provided in the inclined state and serving to move the diaphragms upward and downward, and a tubular supporting member extending obliquely downward from the central portion of the drive member, the small-sized pump being arranged to make the end of the tubular supporting member perform circular motion and to thereby drive the drive member so as to move the diaphragms upward and downward so that respective pump chambers perform pumping actions with a predetermined time lag, the small-sized pump being thereby arranged to have high pumping efficiency.

Abstract: An improved valve plate assembly for use with a reciprocating piston fluid pump such as a low capacity air compressor. A resilient rubber valve molding is positioned over a plate defining inlet and outlet ports for forming a seal between the plate and a cylinder head, for forming an inlet check valve and for forming an outlet check valve.

Abstract: An oscillatory pump includes a cylinder (9) having normally-closed valves (10,13) of flexible material fixedly located at the inlet (A.sub.c) and outlet (B.sub.c) ends of the cylinder (9), and a piston (1) having an inlet (A.sub.p) and an outlet (B.sub.p). The piston (1) is reciprocatable within the cylinder (9) and is provided with a further valve (6) of flexible material movable with the piston (1) and located at the outlet end (B.sub.p) of the piston (1). The piston (1) is constructed to allow fluid to pass from an inlet chamber (C1) formed between the inlet valve (10) and the inlet end (A.sub.p) of the piston (1) to an outlet chamber (C2) formed between the further valve (6) and the outlet valve (13) in response of the piston (1) within the cylinder (9). The valve includes a valve seat having a generally conical first surface portion and a second surface portion located radially inwardly of the first surface portion and extending generally parallel to the axis of the first surface portion.

Abstract: A small and compact vacuum-pressure pump which serves as a portable vacuum-pressure source is disclosed. The pump includes a cylinder coupled with one handle and a piston therein coupled with another handle. A valving means with a rotatable in a cylinder allows either a vacuum or pressure to be created at a port to the valving means. The valving means which is located ahead of an inlet valve to the cylinder can adapt a preexisting vacuum pump to operate either as a vacuum pump or a pressure pump as required.

Abstract: A structural improvement made in the air pump usable in either a single or a plurality of fish bowls. The diaphragms used to prevent the air from flowing in reverse are specially designed in a shape which can be inserted into the outlet of air circulating ports of the pump so as to prevent the diaphragms from slipping away and detaching from the air circulating ports, and finally losing the one-way discharge function accordingly.

Abstract: A pump having a pump body (1), a push-rod (7), a diaphragm (8) with an aperture (17) and a plate valve (9). The push-rod (7) is driven by a motor (10) and is guided centrally in an elastic filter disk (13) mounted in a pump casing (3). A lower end of the push-rod (7) is provided with a dome (12) member by which the diaphragm (8) is pressed into a correspondingly shaped recess (15).

Abstract: A pump comprising an elongated housing adapted to be positioned in a landfill gas well. The housing has a peripheral wall, an interior chamber and apertures in the peripheral wall leading from the exterior of the housing to the chamber so that liquid can flow from the well into the chamber. A pressure responsive valve member is mounted in the chamber on the peripheral wall and extends across the apertures. A discharge conduit extends from the chamber to a location above the housing. When the liquid level in the chamber rises to a predetermined upper level, gas under pressure is supplied to the chamber. The gas under pressure causes the pressure responsive valve member to close the apertures and it forces the liquid out of the chamber through the discharge conduit.

Abstract: A motor-driven continuously running system wherein multiple reciprocating bellows units are disposed in angularly spaced relation about the rotary axis of a swashplate. Each bellows is frame-referenced at one end, and its other end is axially driven by the swashplate. As the bellows units reciprocate in phased succession, air is driven into and expelled through a valve/manifold unit, which channels air to and from outlet and inlet fittings, via integrally formed reed check valves. The output is a steady flow of contamination-free pressurized air.

Abstract: Two concentric vertical cylinders are separated by three radial partitions. An opening at the bottom of one of the partitions connects an air cell on one side of the partition with an outlet chamber on the other side of the partition. The two other partitions form sides of an inlet chamber, which receives fluid from outside the outer cylinder. The inner cylinder has a central pumping section positioned between upper and lower valve sections. In the valve sections ports extend through the inner cylinder wall to the inlet and outlet chambers. Spring loaded valves close the ports. Tension springs extend across the inlet chamber or compression springs extend across the inner cylinder to close the inlet valves. Tension springs extend across the inner cylinder to close the outlet valves. The elastomeric valve flaps have rigid curved backing members. A piston rod extends through one end cover to move a piston in the central section.

Abstract: The invention concerns a reciprocating pump for liquid substances, specifically such contaminated by solids. To render such a reciprocating pump self-cleaning, it is suggested to arrange the intake chamber (7), pressure chamber (2), and the pressure chamber (8) side by side in a horizontal or only slightly declining plane, to arrange the check valves (9, 10, 11, 12) side by side in the same horizontal or slightly declining plane, and to have the pressure socket (20) empty on the bottom side of the pressure chamber. In addition, the intake socket (19) empties suitably from below, vertically or at least steeply rising, into the intake chamber. This design ensures that the paths within the pump extend essentially horizontally or only slightly upwardly, so that any solid particles which have proceeded into the pump housing can be carried out of the pump again.

Abstract: A valve, suitable for use in small medical devices and which can readily be made of medical grade materials, comprises an elastic diaphragm stretched over a protruding surface, preferably of spherical or convex shape. The diaphragm has a ring of holes concentrically around a hole in the protruding surface. A mating recess, connected to a conduit, fits over the protruding surface. The elastic material is held in place at or near the opening of the recess. The holding structure may also serve to seal the valve. A dual arrangement provides an input and an output valve in combination.

Abstract: A pump comprising a housing and a flexible diaphragm mounted in the housing. A first region of the diaphragm partially defines a first pumping chamber, and the pumping chamber has an inlet and an outlet. A wobble plate drive is coupled to the first region of the diaphragm to provide a pumping action in the pumping chamber. The wobble plate drive has a nutating axis, and the first region of the diaphragm lies radially outwardly of the nutating axis. The first region of the diaphragm has a generally annular ramp section which flexes when driven by the wobble plate drive to provide the pumping action, and the ramp section is wider radially at a location remote from the nutating axis than at a location nearer the nutating axis. The pump also has a single outlet valve arranged to serve multiple pumping chambers.

Abstract: The invention concerns the combination of electric motor, diaphragm air pump, valving and switches in a compact form to provide a low pressure air supply and control system for use in inflating and/or deflating air chambers in seats. The air chambers may be so placed as to provide support to areas of the back of an occupant, support to the occupant's thighs, either singly or both at the same inflation/deflation and/or movement of the side bolsters of the seat. Additionally, it may be used to inflate/deflate the seat bottom.

Abstract: An insertable, integrally molded, one-piece valve assembly for use in the intake bore of the pump of a liquid dispensing device has a body portion and a top portion which is spaced from the body portion by resilient links. The body portion is pressed into the bore a distance determined by an external stop area, and has a flow passage in which a valve seat is located. The top portion is formed to fit loosely in the bore and abuts against an internal stop area which prevents further inward movement. A compression member extends between the top portion and the body portion and has a valve plug molded on the end which engages the valve seat in normally closed valve relation.

Abstract: This invention relates to an improved fluid pump. The pump is of the type, wherein a reciprocating motor acts in concert with supply and exhaust valves to pump fluid from a source to its destination. In the preferred embodiment, the motor comprises a reciprocating diaphragm and the supply and exhaust valves comprise a single resilient plate with individual valve members formed as cutouts therein. The valve plate is sandwiched between two plates which form the associated porting. The interaction between the various ports on the valve plates results in improved sealing effect for the valves.

Abstract: An improved hand-operated vacuum pump is disclosed and includes a cylinder, head assembly, and elastic seal member. The cylinder and head assembly define opposing grooves, and the elastic seal member is positioned in the grooves to secure the head assembly to the cylinder. A piston assembly is operative within the cylinder to draw a vacuum within the head assembly.