Abstract: Described are fluid pumping and fluid handling systems, which may be suitable for use in medical devices, such as artificial or extracorporeal blood pumping systems. The systems can include a dual housing configuration for pneumatic actuation comprising a main housing containing a pump cassette comprising a pneumatically actuated pump and pneumatically actuated valves. The pump can include a pump actuation chamber and pump pneumatic port, and the valves can each include a valve actuation chamber and valve pneumatic port. Connecting tubes can be used to fluidly connect the pump actuation ports and valve actuation ports to a tube-support housing having a first side receiving one end of each connecting tube and a second side providing a pneumatic interface arranged to connect to an array of pneumatic receptacles on a base unit of the system to facilitate easy, compact and accurate pneumatic interconnection between the pump cassette and the base unit.

Abstract: A trigger sprayer includes an engine with a piston chamber and an outlet fluid passage, and a piston that slides within the piston chamber and defines an interior bellows chamber. The bellows component is movable in the interior bellows chamber between an uncompressed position in which a fluid volume in the interior bellows chamber is minimized and a compressed position in which the fluid volume is maximized. The trigger sprayer further includes a trigger lever that pivots between a neutral position and an actuated position using a pair of S-shaped trigger springs. Pivotal movement of the trigger lever pushes the piston vertically in the piston chamber to drive fluid from the piston chamber into the interior bellows chamber and move the bellows component from the uncompressed position to the compressed position. Relaxation of the bellows component drives fluid from the interior bellows chamber to the outlet fluid passage.

Abstract: Embodiments of the invention relate to dosing dispensers and in particular to dosing dispensers that may be operated using one hand by raising and filling a dosing chamber followed by lowering and dispersing a product from the dosing chamber and wherein the dose may be selected or adjusted and a user may visually confirm that the proper dose is being loaded and delivered by the dispenser.

Abstract: An improved manifold and valve cartridges suitable for high power (over 600 hp) reciprocating pumps for water blast or jet applications are disclosed. In one aspect, the disclosed valve cartridges are compact and mounted axially along a seat member that has a central bore in addition to suction and discharge seats. The seat member can also be provided a plurality of radially arranged bores for allowing suction flow to the pump. A spool valve assembly can be mounted through the seat member bore, and can include a valve spool, a spherical suction valve member, a compression spring, and compression-locked rings. The spool valve can include a closed flanged end that engages with the seat member discharge seat. In operation, the compression spring continuously pushes the spool valve closed flanged end against the discharge seat and pushes the suction valve member against the suction seat to retain a normally closed position.

Abstract: A system, including a compressor including a cylinder with a chamber, a first axial end portion, and a second axial end portion, and a piston in the chamber of the cylinder, the piston is configured to reciprocate along a cylinder axis between the first and second axial end portions, and a co-axial flow device coupled to compressor, the co-axial flow device includes a first wall disposed about a first passage along an axis, a second passage disposed about the first wall along the axis, and a second wall disposed about the second passage along the axis, the first passage includes a first axial opening in fluid communication with the chamber while the piston moves in a first axial direction, and the second passage includes a second axial opening in fluid communication with the chamber while the piston moves in a second axial direction opposite from the first axial direction.

Abstract: A pressure regulating restriction for allowing a cylinder bore and a valve plate discharge port to communicate with each other before the cylinder bore communicates with the valve plate discharge port, and an oil passage for allowing the valve plate discharge port and the cylinder bore to temporarily communicate with each other in a time period after the cylinder bore is freed from the communication with the valve plate suction port until the cylinder bore communicates with the pressure regulating restriction. The oil passage has length capable of transmitting high pressure in the oil passage on a side of the cylinder bore at the time of the communication and of restoring the pressure in the oil passage on the side of the cylinder bore to the pressure on a side of the valve plate discharge port before the communication with a next cylinder bore at the time of non-communication.

Abstract: A diaphragm pump is provided that features a valve housing configured with inlet openings and outlet openings; inlet duckbill check valve assemblies, each configured to be arranged in a respective inlet opening; and outlet duckbill check valve assemblies, each configured to be arranged in a respective outlet opening; each duckbill check valve assembly comprising: a duckbill check valve seat configured with an end having a slit to open to provide the fluid and particulate, and to close to prevent the backflow of the fluid and particulate; and a duckbill check valve support having a base portion configured to be inserted inside the duckbill check valve seat, and having a W-shaped portion configured with an opening to pass the fluid and particulate through the duckbill check valve support to the duckbill check valve seat and also configured to provide support for walls of the duckbill check valve seat in response to back pressure caused by the fluid and particulate.

Abstract: A compressor includes a cylinder block including cylinder bores and pistons within the cylinder bores. A front housing opposes a first cylinder block end face to form a crank chamber accommodating a piston driving mechanism. A valve plate opposes a second cylinder block end face and includes suction and discharge holes. A rear housing includes suction and discharge chambers and opposes the second cylinder block end face with the valve plate there between. Strap-shaped suction valves on the valve plate end face oppose the cylinder block, thereby opening and closing the suction holes at tip portions. Discharge valves on the valve plate end face oppose the rear housing to open and close the discharge holes. Through-bolts join the front housing, the crank chamber, the cylinder block, the valve plate, and the rear housing. The valve plate includes grooves extending from holes accommodating the through-bolts to portions abutting the suction valves.

Abstract: A pump chamber (15) is formed between a piezoelectric vibrator (7) and a valve main plate (10). The valve main plate (10) includes an inlet port (13) at its central portion, and an outlet port (14) in its peripheral portion, and the inlet port (13) is made in a smaller diameter than the outlet port (14). On the valve main plate (10) an inflow check valve (11) and an outflow check valve (12) are provided, so that when the inflow check valve (11) and the outflow check valve (12) open and close in response to the vibration of the piezoelectric vibrator (7), a fluid is introduced into and discharged from the pump chamber (15).

Abstract: A compressor may include a compressor body defining a compression cylinder, a compressor head coupled to the compressor body, and a valve plate assembly disposed between the compressor head and the compressor body. The valve plate assembly may include a first valve plate formed as a unitary casting and defining a suction chamber exposed to a suction pressure region of the compressor.

Abstract: An apparatus for constructing a high pressure fluid pump has a piston housing, a pump head connected to and supported by the piston housing, and a pump pedestal for supporting the pump head and the piston housing. The pump head receives water at low pressure and, in combination with the piston housing, produces fluid through a flow channel at high pressure. The combination of piston housing and pump head contain a “go-thru” valve which, in response to a suction on one side of the valve allows water at low pressure to pass through the valve into a receiving chamber, and in response to a high pressure fluid in the receiving chamber enables fluid at a high pressure to pass through the valve and eventually to an output port while closing off the input path. The pump further has an aluminum pump head or manifold appropriately structured to withstand high pressure fluid impact.

Abstract: A reed valve having a plurality of tips and associated recesses is provided as a compressor suction valve with each valve tip coacting with a suction port. The recesses are located in the housing structure defining the cylinder of the compressor and are spaced a distance on the order of 0.1 inches from the tips when the suction valve is closed. The valve is secured on one side of the cylinder and each tip is located along a line from the center of the cylinder through the center, or axis, of a suction port.

Abstract: A pump/compressor that utilizes a wedge at a fixed angle to operate the pump's pistons at a fixed stroke. Alternatively the wedge can be moved axially to increase or decrease the clearance volume. Variable fluid flow at any clearance volume is achieved by rotating the wedge with respect to the port plate thereby changing the timing of the pistons with respect to the fixed port plate which changes the timing of the intake and output cycles. This results in a portion of the intake charge being breathed back into the intake port and a portion of the output charge being breathed back from the outlet port. This causes the pistons to not take in a full charge from the inlet port and to not pump out a full charge into the outlet port. Thus, fluid flow is varied. The design results in a smaller pump as the wedge is supported by the pump housing rather than a mechanical linkage required of prior adjustable angle swashplate designs.

Abstract: The invention relates to a control plate (20) for an axial piston engine (1). The inventive control plate (20) comprises a through hole (38) and a radial internal edge of said control plate (20) embodied in the form of a centering surface (29) which centers the control plate (20) to a centering body (7) arranged on the side of a bearing surface. Said centering surface (29) consists of several partial surfaces (29.1, 29.2, 29.3) formed on segments (43.1, 43.2, 43.3) of the internal edge (47) of the control plate (20) radially extending towards the internal space of said through hole (38). The segments (43.1, 43.2, 43.3) are divided by cuts (36.1, 36.2, 36.3).

Abstract: The sheath flow forming device includes: a container for storing sample fluid and having a supply port for supplying the sample fluid; a second container for storing sheath fluid and having a supply port for supplying the sheath fluid; a flow cell having a sample fluid inlet for receiving sample fluid supplied from the supply port of the first container, a sheath fluid inlet for receiving the sheath fluid from the supply port of the second container, and an outlet for discharging the mixture of the sheath fluid and the sample fluid; a first pump for supplying a sheath fluid to the sheath fluid inlet; a second pump for suctioning fluid within the flow cell through the outlet of the flow cell; and a first drive source for driving the first pump and second pump.

Abstract: A fluid priming pump in combination with a reed valve for the control of incoming and exiting fluid flow is disclosed. The fluid priming pump includes a pump body and a movable plunger with the reed valve positioned adjacent the pump body. Two embodiments of the reed valve are disclosed, including an integral design where the unitary valve panel is insert molded with the valve body. In the second embodiment, the unitary reed valve is based on co-injection molding technology. Each reed valve design comprises only two component parts and becomes operable without the need for any additional mechanical components or fasteners. Pressure forces created by the fluid priming pump govern the opening and closing of valve panel portions for controlling the incoming and exiting fluid flow through the fluid priming pump.

Abstract: A reed valve having a plurality of tips and associated recesses is provided as a compressor suction valve with each valve tip coacting with a suction port. The recesses are located in the housing structure defining the cylinder of the compressor and are spaced a distance on the order of 0.1 inches from the tips when the suction valve is closed. The valve is secured on one side of the cylinder and each tip is located along a line from the center of the cylinder through the center, or axis, of a suction port.

Abstract: A diaphragm pump 1 has a base block 2, a diaphragm 8 and a drive unit for driving the diaphragm to reciprocate. The base block 2 has three or more liquid flow paths, each having three recesses 23 through 25 or more recesses.

Abstract: A unit utilizing current to control reciprocation for pushing fluids, including a chamber, a magnet, a coil connected with a circuit, a first inlet, a first outlet, a second inlet, a second outlet, a first valve and a second valve. The magnet is slidably disposed in the chamber. The coil is disposed around the chamber for driving the magnet to reciprocally move. The first inlet and first outlet are disposed at one end of the chamber. The second inlet and second outlet are disposed at the other end of the chamber. The first valve is disposed between the first inlet, the first outlet and the chamber. The second valve is disposed between the second inlet, the second outlet and the chamber. The magnet can drive the first and second valves to suck a fluid into the first and second inlets and push a fluid out of the first and second outlets.

Abstract: A pump includes a base, a tubular portion formed on the base and with an upper end and a lower end, a pressure gauge communicated with the tubular portion near the upper end, a cylinder communicated with the tubular portion near the lower end, a piston movably received in the cylinder, a rod connected with the piston and a nozzle communicated with the lower end of the tubular portion. The tubular portion defines a transverse channel. The cylinder defines an aperture. A first joint defines an axial channel and a transverse channel communicated with the axial channel. The first joint is received in the cylinder. A second joint defines an axial channel, a first transverse channel communicated with the axial channel thereof and a second transverse channel communicated with the axial channel thereof.

Abstract: An acceleration fuel pump for use with a combustion engine carburetor is an integral part of the carburetor body and provides an additional flow of fuel to the fuel-and-air mixing passage of the carburetor during acceleration of the engine. The acceleration fuel pump has a plunger which inserts sealably into a cylindrical cavity carried by the body of the carburetor. During acceleration of the engine, the plunger inserts further into the cavity against the resilient force of a spring and toward a resilient check valve member causing the member to deform into a fuel feed state. A fuel passage which extends between the bottom of a fuel chamber of the carburetor and the fuel-and-air mixing passage of the carburetor is intersected by the cavity and the resilient check valve member.

Abstract: In a piston pump, in particular for pressure medium delivery in slip-controlled hydraulic brake systems, including a suction valve and a delivery valve, external preassembly and possibilities of external testing of the delivery and suction valves result from providing the suction valve and the delivery valve within a component which can be handled independently. The component preferably includes a delivery valve provided radially to the center line and a valve seat member, with a valve body of the delivery valve being prestressed by a tongue of a clamp, placed onto the valve seat member, against a valve seat formed within the valve seat member.

Abstract: The radial piston pump possesses a pump body with a plurality of cylinder borings for the reception of pump pistons which can be driven by a cam. The cylinder borings are closed by valve plugs in which pressure passages are provided. In the pressure passages, outlet valves are inserted which respectively possess a valve stem (7) an end of which, proximate to the pump piston (1), is provided with an impact plate.

Abstract: In a piston pump (1), in particular for pressure medium delivery in slip-controlled hydraulic brake systems, including a suction valve (82) and a delivery valve (81), external preassembly and possibilities of external testing of the delivery and suction valves (81,82) result from providing the suction valve (82) and the delivery valve (81) within a component (8) which can be handled independently. The component (8) preferably includes a delivery valve (81) provided radially to the center line and a valve seat member (70), with a valve body (95) of the delivery valve (81) being prestressed by a tongue (121) of a clamp (120), placed onto the valve seat member (70), against a valve seat (96) formed within the valve seat member (70).

Abstract: An acceleration fuel pump for use with a combustion engine carburetor is an integral part of the carburetor body and provides an additional flow of fuel to the fuel-and-air mixing passage of the carburetor during acceleration of the engine. The acceleration fuel pump has a plunger which inserts sealably into a cylindrical cavity carried by the body of the carburetor. During acceleration of the engine, the plunger inserts further into the cavity against the resilient force of a spring and toward a resilient check valve member causing the member to deform into a fuel feed state. A fuel passage which extends between the bottom of a fuel chamber of the carburetor and the fuel-and-air mixing passage of the carburetor is intersected by the cavity and the resilient check valve member.

Abstract: The present invention relates to microfluidic systems, including valves and pumps for microfluidic systems. The valves of the invention include check valves such as diaphragm valves and flap valves. Other valves of the invention include one-use valves. The pumps of the present invention include a reservoir and at least two check valves. The reservoir may be of variable volume. The present invention also relates to a flexible microfluidic system. The present invention additionally relates to a method of making microfluidic systems including those of the present invention. The method includes forming a microfluidic system on a master, connecting a support to the microfluidic system and removing the microfluidic system from the master. The support may remain connected to the microfluidic system or the microfluidic system may be transferred to another substrate. The present invention further relates to a method of manipulating a flow of a fluid in a microfluidic system.

Abstract: In the suction valve structure of the piston type compressor of the present invention, the primary suction valve 38 is a flexible deforming valve composed of a deforming section 381, which is supported and bent by a cantilever method, and a closing section 382 which connects with a forward end of the deforming section 381 and closes the primary suction port 21. The auxiliary suction valve 39 is a flexible deforming valve composed of a deforming section 391, which is supported-and bent by a cantilever method, and a closing section 392 which connects with a forward end of the deforming section 391 and closes the auxiliary suction port 22. In the present invention, the length of the deforming section 381 of the primary suction valve 38 is approximately the same as that of the deforming section 391 of the auxiliary suction valve 39, however, the width of the deforming section 381 of the primary suction valve 38 is made larger than that of the deforming section 391 of the auxiliary suction valve 39.

Abstract: A compressor includes a cylinder block and a housing connected to the ends of the cylinder block. A suction chamber and a discharge chamber are defined in the housing, respectively, and the chambers are divided by a bulkhead, or wall. A valve plate, which has a discharge port for connecting the cylinder bores with the discharge chamber, is positioned between the cylinder block and the housing. A discharge valve is provided for selectively opening and closing the discharge port. A gasket is positioned between the housing and the valve plate, and the gasket is held to the bulkhead. The gasket has a bulkhead seal portion, which is between the bulkhead and the valve plate for sealing between the discharge chamber and the suction chamber, and a protruding portion, which protrudes radially beyond the bulkhead, extending along and contacting the valve plate.

Abstract: A single-acting manual pump for feeding lubricant to metering units provided in a lubrication line, of the type comprising a body (10) housing a piston (1) movable within a chamber (2) against the action of elastic means (3), and unidirectional valve means (4) provided in correspondence with at least one entry aperture (5) and at least one exit aperture (6) formed in a portion (2A) of said chamber (2), said means being arranged to enable a predefined quantity of lubricant to enter said portion (2A) of the chamber (2) from a reservoir (7) when the piston is raised, and to enable said quantity of lubricant to leave towards a tubular delivery channel (8A, B, C) when the piston (1) is released to return to its rest position by the action of said elastic means.

Abstract: A reciprocating compressor is provided. Compression chambers are formed on at least one end of pistons slidably received within respective cylinder bores of a cylinder block. A cylinder head is secured to the cylinder block and has a high-pressure chamber and a low-pressure chamber formed therein. A separating member is arranged between the cylinder block and the cylinder head. The separating member has a valve sheet, a valve plate, a stopper plate. The valve sheet is formed with suction valves and discharge valves. The valve plate is arranged between the valve sheet and the cylinder block, and formed with refrigerant outlet ports and relief holes each opening into a corresponding one of the compression chambers, for communicating with a corresponding one of refrigerant inlet ports formed through the stopper plate when the corresponding suction valve opens.

Abstract: A pump including a first portion (2) with a metering cylinder (3) containing a plunger (4), and a second portion (7) engaging the surface of the first portion (2) in which the outlet of the cylinder (3) is located, and comprising a recess (10) located opposite the cylinder for delivering a liquid. A flexible impervious membrane (8) clamped between the two portions (2, 7) comprises an opening (13) facing the cylinder (3) and a resilient circumferential ring (12) engaging the bottom of the recess (10). A disc (14) in the central area of the recess engages the membrane (8), and a duct (6) linked to the cylinder (5) and having an outlet in the same surface of the first portion (2) as the cylinder (5) is connected to a liquid discharge tubing.

Abstract: A high-pressure plunger pump assembly, in particular for working pressures above 2000 bar, includes a housing, a cylinder received in the housing and defining a working space which has an expanded area along a section thereof for receiving a sleeve therein, and a plunger slidably moveable in the working space of the cylinder and in the sleeve and being suitably operated by a drive for reciprocating movement. The sleeve has one end closer to the plunger drive and formed with an annular flange. A suction valve communicates with the cylinder for admitting fluid from a suction chamber into the working space, and a pressure valve communicates with the cylinder for expelling fluid from the working space during a pressure stroke of the plunger, with a seal being positioned in a transitional area from the annular flange to the cylinder between the working space and the suction chamber.

Abstract: In a diaphragm pump flap valves accommodated in a pump head are provided which have a valve disk in which are situated valve flaps (14) circumscribed by partial ring-shaped recesses. These are respectively flexibly connected with the remaining valve disk (15) by means of a web (17). The valve disk is clamped between pump head elements in an area circumscribing each respective valve. In order to avoid material displacements and deformations resulting from the clamping from acting upon the web and the valve flap (14), it is provided that an opening (19) of the valve disk (15) is situated in a connecting area between valve flap (14), web (17) and outer clamping (18), facing away from the valve flap (14). Material displacements originating from the clamping area (18) can thereby no longer influence the valve flap (14) and the web (17), since a transmission of these material deformations is interrupted in the area of the opening (19).

Abstract: A reciprocating compressor includes a cylinder block having a plurality of compression chambers formed therein and a cylinder head secured to the cylinder block and having a high-pressure chamber formed therein. A first member is arranged between the cylinder block and the cylinder head and has a plurality of discharge ports formed therethrough for communicating the plurality of compression chambers to the high-pressure chamber. The reciprocating compressor comprises a second member having a plurality of discharge valves formed therewith for opening and closing the plurality of discharge valves, and a third member having a plurality of stoppers formed therewith for each setting a proper limit to resilient deformation of a corresponding one of the plurality of stoppers.

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: 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: A fluid valve device for on-off control of fluid flow through a passage extending between two fluid ports (12, 15) and including a valve seat (17A) comprises a hollow valve member (21) which is movable into and out of sealing engagement with the valve seat and defines a valve chamber (20). The valve chamber (20) communicates with one of the fluid ports (15) through the valve seat (17A) and is associated with a valve member actuating device (A) which translates the pressure of the fluid received in the valve chamber (20) from an inlet (12/14) for the fluid flow into a force acting on the valve member to displace it relative to the valve seat (17A). The valve member actuating device in one embodiment includes a thrust surface (A) on the valve member (21) which is directed away from the valve seat and forms part of the wall of the valve chamber (20). A second thrust surface (C) on the valve member (21) is directed oppositely and defines a chamber (V) which is isolated from the valve chamber and the flow passage.

Abstract: An infusion pump includes at least one cylinder-and-piston intake device for a liquid in a container and for dispensing the liquid into a connection link to the patient. In a preferred embodiment, the pump includes at least one metering cylinder containing a piston, each cylinder terminates in a cavity communicating with a supply receptacle for liquids, a diaphragm that is fluid-tight and deformable between the cylinder and the cavity, a disk located in each cavity, a spring urging the disk towards the cylinder, and a delivery connection between the cavity and the cylinder.

Abstract: A homogenizer includes a homogenizing valve assembly mounted to a pump block. A set of one or more pump chambers is formed in the block and a plunger is positioned in each chamber. Each pump chamber is formed along a substantially horizontal pump axis and extends through the pump block. A removable check valve module comprising a suction valve assembly and a discharge valve assembly is positioned in a bore which intersects each pump chamber. Each valve module is secured in the bore by a retaining pin such that the module can be easily and quickly removed as a single unit.

Abstract: A fluid end assembly for a plunger pump of the type having a power end to which fluid end assemblies are attached, the fluid end assembly having a plurality of cylinders, a valve housing attachable to one end of the cylinders, clamps for clamping the cylinders, fastening devices passing through the valve housing, and engaging the clamps, and the fastening devices being secured in the power end, and abutments formed on the fastening devices between the clamps and the power end, to confine the load developed in the valve housing, between the valve housing and the cylinders and thereby reduce the load on that portion of the fastening devices secured in the power end.

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: 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: A down-hole pump adapted for operation in connection with a string of tubing and a string of reciprocating sucker rod. A pump includes a cylindrical housing connectable to the tubing and connected to a pump barrel; a piston rod connected to a piston disposed within the barrel and extending through the housing for connection to the sucker rod; a valve piston disposed in freely slidable relation within the barrel and around the piston rod between a down piston and an up piston; a base housing end connected to the bottom of the housing; and a top housing end connected to the top of the housing. A plurality of axially aligned liquid flow discharge openings are defined in the piston valve and the top housing end and circumferentially disposed on a first radius.

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: 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: The pump has a pumping chamber with a deflectable diaphragm member and fluid inlet and outlet passages. A deflectable valve flap is disposed across the fluid inlet passage and another flexible valve flap is disposed across the fluid outlet passage. Movement of the flexible valve flaps is responsive to movement of the flexible diaphragm member, reciprocation of which establishes alternate sequential suction and discharge conditions. An air chamber provided in the pump receives outside air through an air vent opening and also communicates with the pump discharge passage through a bleed hole when the outlet passage is closed by the outlet valve flap. The outlet valve flap is also deflectable to a position where it closes the bleed hole. Under this arrangement, continuous siphoning of fluid through the pump after the pump has been shut down is obviated.

Abstract: This invention relates to a manual liquid dispensing device for spraying liquid by squeezing the trigger thereof. An adapter is inserted into a cylinder bore forming a pressurizing chamber. A piston is slidably mounted within the adapter. This adapter has an inlet communicating with the intake portion and an outlet communicating with an outlet passage to a nozzle hole formed at the bottom end thereof. A valve advantageously formed is attached to the end of the adapter to open only the inlet at pressure reducing time of the pressurizing chamber and to open only the outlet at pressurizing time. This valve is made of elastic material as a single unit.

Abstract: Intravenous Fluid Pumping System having a controller and a pump controlled by the controller. The controller has a sealed chamber with a flexible membrane covering a portion thereof. An incompressible fluid is disposed in the chamber. A piston member is movable in the chamber causing extension and retraction of the membrane as the piston is moved in and out relative to the chamber. A motor is provided for reciprocating the piston. The pump has a pump body with a pumping chamber therein with one portion of the pump body being covered by a flexible membrane in contact with flexible membrane carried by the sealed chamber of the controller. The pump has an inlet adapter connected to the source of fluid. The pump also has an outlet adapter connected to the patient.

Abstract: A reed valve assembly is provided with a reed sandwiched between two base members, e.g. a valve plate and a cylinder head of a compressor. The reed is clamped between the two members at a central part whereby both free ends of the reed can flex. The base members are so structured that one free end of the reed forms an intake valve members and the other a discharge valve member, whereby a single reed serves both as an intake valve member and as a discharge valve member. The invention also avoids rivets or the like elements by securing the reed to the base solely by the clamping action of properly recessed faces of the two base members.

Abstract: A fluid pump has an inlet, an outlet, a pumping chamber, pumping means, and inlet and outlet check valves. In one embodiment each check valve is formed by a flexible member positioned between a pair of relatively rigid members, the latter each having an opening bounded by a surface portion thereof with such surface portions cooperating with the flexible member to provide a fluid-tight seal therewith. The flexible member includes a movable means which moves upon flexure of such member in response to a pressure differential across the same and being operative when moved substantially to the respective extreme positions to block fluid flow between respective passages or to pass fluid flow between such passages. Moreover, a contact carrier is provided for repeatably intermittently closing contacts and opening the same. Such carrier is formed by a curved arm having a tendency to assume a natural condition, e.g.