Abstract: A cylinder assembly of a hermetic compressor has a valve plate disposed on an outer side of a cylinder block to cover an open side of a cylinder, the valve plate defines a refrigerant discharge hole therethrough which is adapted to discharge a compressed refrigerant from the cylinder. A cylinder head disposed to cover the outer side of the valve plate defines a refrigerant discharge chamber in cooperation with the valve plate. A discharge valve is disposed between the valve plate and the cylinder head in a cantilever fashion with a central portion thereof covering the refrigerant discharge hole. A restricting mechanism comprising a first stopper member protruding from an inner wall of the cylinder head a distance such that a terminal edge of the first stopper member is at a predetermined distance from a free end of the discharge valve for restricting movement of the discharge valve.

Abstract: A micropump has two chambers separated by an actuator for causing fluid to flow in the chambers. Each chamber is equipped with a ball that acts as a valve for allowing flow in a desired direction. The balls are heavier than the fluid being pumped, and reside at an interface between the chambers and passages feeding fluid into the chambers and provide a tight seal between the chambers and passages feeding the chambers when fluid pressure forces the fluid back toward the feeding passages.

Abstract: Valve guide and spring retainer assemblies are described for use in plunger pump housings that incorporate structural features for stress-relief. These pump housing structural features accommodate correspondingly-shaped valve guides and/or spring retainers that are internally fixed in place using one or more non-threaded spacers. Plunger pumps so constructed are relatively resistant to fatigue failure because of stress reductions, and they may incorporate a variety of valve styles, including top and lower stem-guided valves and crow-foot-guided valves, in easily-maintained configurations. Besides securing valve guides and/or spring retainers, non-threaded spacers may be shaped and dimensioned to aid in further reducing stress and to improve volumetric efficiency of the pumps in which they are used.

Abstract: A reciprocating refrigerant compressor includes a cylinder block having a cylinder bore, and a compression chamber defined within the cylinder bore. A cylinder head has a low-pressure chamber for receiving refrigerant gas to be drawn into the compression chamber, and is coupled to one end face of the cylinder block. A valve plate is arranged between the compression chamber and the low-pressure chamber, and includes an inlet port for guiding the refrigerant from the low-pressure chamber into the compression chamber. An inlet valve opens and closes the inlet port and has an end whose shape is adapted to a shape of the inlet port. The shape of the inlet port is non-circular, and a portion of an opening edge of the inlet port protrudes into the inlet port. Tangential lines drawn from the protruding portions intersect the opening edge of the inlet port at at least two points.

Abstract: A hermetic compressor having a cylinder assembly comprising a casing into which refrigerant flows, a rotor rotatably inserted in a stator disposed inside the casing, crank shaft, connecting rod connected with the crank shaft, piston, and cylinder assembly comprising a cylinder block, a valve plate connected with one side of the cylinder block and having a suction port for sucking refrigerant into the cylinder and discharge port for discharging the compressed refrigerant from the cylinder in the cylinder block, a suction valve for selectively opening the suction port, discharge valve for selectively opening the discharge port, cylinder head having suction and discharge chambers, a refrigerant path formed at one side of the cylinder head for letting refrigerant flow into the suction chamber, and a groove removed from the refrigerant path formed on the valve plate for guiding refrigerant from inside the casing into the suction chamber.

Abstract: A fluid end for a high-pressure pump. The fluid end includes a pump housing having a plunger bore within which is positioned a reciprocating plunger. Extending upwardly at an incline from the inner end of the plunger bore is a discharge passage. Extending downwardly at an incline from the inner end of the plunger bore is a suction passage. Discharge and suction valves are secured, respectively, within the discharge and suction passages.

Abstract: A membrane pump (1) having a membrane (24) which can be actuated by a crank drive (32), which membrane bounds, together with a concave pump body surface (8), a pump chamber (38), an inlet channel (4) and an outlet channel (17) which open out at an inlet opening (9) and an outlet opening (20) in the pump body surface (8), the membrane (24) having a membrane core (25) and an elastically deformable membrane ring (26) and the membrane core (26) having a convex surface adapted to the pump body surface (8). The inlet opening (9) is arranged in the region of the pump body surface (8) which the membrane (24) first approaches upon an expulsion stroke of the crank drive (32), and the elastically deformable membrane ring (26) closes the inlet opening (9) before the attainment of top dead center of the crank drive (32).

Abstract: Between a cylinder block and a housing, there is disposed a valve base plate. The valve base plate is formed with mutually isolated first and second intake openings for fluidly communicating each of piston chambers in the cylinder block with an intake chamber defined in the housing. A reed valve element is incorporated with each piston chamber. The reed valve element is arranged to open the first and second intake openings with the aid of a fluid when the piston is moved away from the reed valve element and close the first and second intake openings with the aid of the fluid when the piston is moved toward the reed valve element. Due to provision of the two, viz., first and second intake openings, opening movement of the reed valve element is carried out along with a twisting motion of the same.

Abstract: A compressor has a first housing, a second housing, a valve plate, a suction valve, a discharge valve and a sealing coat. The first housing includes a compression chamber. The second housing includes a suction chamber and a discharge chamber. The valve plate is interposed between the first housing and the second housing. The suction valve is disposed between the first housing and the valve plate. The discharge valve is disposed between the second housing and the valve plate. The valve plate forms a suction port intercommunicating the suction chamber and the compression chamber, and a discharge port intercommunicating the discharge chamber and the compression chamber. The sealing coat made of soft metal is provided between the suction valve and the valve plate, and/or between the discharge valve and the valve plate.

Abstract: A cylinder assembly for a hermetic compressor includes a cylinder block having a cylinder in which a piston reciprocates; a cylinder head connected to a cylinder block to seal the cylinder, the head having an inlet hole and being divided by a partition into a first and a second discharge chamber that serve as an outlet path. A valve assembly formed between the cylinder block and the cylinder head, which controls refrigerant outlet and inlet to and from the cylinder according to different refrigerant pressures inside and outside the cylinder. When a sound wave (that is created as the suction valve or the discharge valve hits the valve plate) escapes to a discharge valve through a first and second discharge chambers, sound transmission loss occurs due to boundary interference and as a result, the sound wave is reduced. By this method, noise can be reduced in operating the compressor.

Abstract: A reciprocating piston compressor for a gaseous medium is provided having a reduced structural height. The compressor is especially for a level control system in a motor vehicle. The maximum pivot angle of the piston ring longitudinal axis relative to the longitudinal axis of the cylinder running path is smaller during the upward movement of the piston than for the downward movement of the piston. The longitudinal axis of the cylinder running path is offset relative to the first spatial axis.

Abstract: A lubricant supply apparatus for a reciprocating compressor is provided having a lubricant cylinder fixed to a compressing unit having a lubricant suction passage and oscillating with the compressing unit. A lubricant piston is slidably inserted into the lubricant cylinder for sucking and discharging lubricant by generating a pressure change inside the lubricant cylinder in coordinated oscillation with the compressing unit. A lubricant valve fixed to the compressing unit and having a lubricant suction valve opening in a suction process of the lubricant piston and a lubricant discharge valve opening in a discharge process of the lubricant piston are also provided. A valve cover covers the lubricant valve and is fixed to the compressing unit and includes a discharge port opening and shutting by the lubricant suction valve.

Abstract: A miniature air compressor includes a motor, a compression cylinder, a lower valve seat, an upper valve seat, and a noise suppression cylinder. Thus, the miniature air compressor may provide a stable pressurized air flow whose noise and impurity may be eliminated by the noise suppression cylinder, thereby enhancing the usage effect of the injection pen device. In addition, the miniature air compressor has a simple construction, may be assembled and amended easily and conveniently, and may reduce the cost of production.

Abstract: A fluid end for a high-pressure pump including a unitary body with a plurality of horizontal passages each for receiving a reciprocating plunger at one of its ends and a pressure relief valve at the other of its ends. The body is provided with a corresponding number of vertical passages each of which intersect one of the horizontal passages and contains a suction valve at its bottom and a discharge valve at its top. A suction manifold is hingedly attached to the bottom of body to provide a flow of fluid into the body via the suction valves. A discharge passage intersects the vertical passages and receives fluid pressurized by the plungers via discharge valves and ports such from the fluid end.

Abstract: A refrigerant compressor includes a front housing, a cylinder block, a rear housing, and a valve plate positioned between the cylinder block and the rear housing, in which the valve plate has a suction hole formed therethrough. The compressor also includes a suction chamber and a suction valve reed formed on the valve plate. The compressor further includes a limiting recess formed within an end of the cylinder block adapted to receive the suction valve reed. The limiting recess includes an arced segment intersecting a center axis of the suction valve reed. Moreover, the portion of the arced segment which intersects the center axis of the suction valve reed has a corresponding tangential line at the point of intersection which forms an oblique angle relative to the center axis of the suction valve reed.

Abstract: The invention concerns a pump for pumping a first liquid, called transferred liquid, and comprising a main unit (18) for pumping the transferred liquid actuated by an auxiliary unit (20) pumping a second liquid, called working liquid. The main (18) and auxiliary (20) units are housed in a casing (16) generally cylindrical in shape. The main unit (18) comprises at least two valves (36, 38), for respectively sucking up and delivering the transferred liquid, borne by a valve body (40) housed in the casing (16). Each valve (36, 38) communicates with two chambers, respectively a suction chamber (46) and a delivery chamber (48) for the transferred liquid, defined by opposite surfaces (50, 52) provided in the valve body (40) and the casing (16). Said surfaces (50, 52) comprise two matching shoulders (50E, 52E) pressed against each other so as to form a tight joint plane separating the suction chamber (46) and the delivery chamber (48).

Abstract: A gas compressor and method according to which a plurality of inlet valve assemblies are angularly spaced around a bore. A piston reciprocates in the bore to draw the fluid from the valve assemblies during movement of the piston unit in one direction and compress the fluid during movement of the piston unit in the other direction and the valve assemblies prevent fluid flow from the bore to the valve assemblies during the movement of the piston in the other direction. A discharge valve is associated with the piston to permit the discharge of the compressed fluid from the bore.

Abstract: An electric pump includes a cylinder, a pumping element, a cap and a spring. The cylinder defines a space and at least one aperture in communication with the space and includes a first end defining an aperture and a second end defining an opening. The pumping element is received in the cylinder for pumping air through the aperture defined in the first end of the cylinder, the space and the at least one aperture. The battery includes a first electrode and a second electrode, and is received in the cylinder so that the first electrode is in electric connection with the pumping element. The cap is engaged with the second end of the cylinder. The spring is attached to the cap. The spring is in electric connection with the pumping element. The cap includes an OFF position where the spring is off the second electrode and an ON position where the spring is in connection with the second electrode. A tubular joint is secured to the first end of the cylinder.

Abstract: A reciprocating compressor includes a linear motor having a piston reciprocating inside a cylinder. A cylinder head is provided with suction and discharge orifices. A valve means is mounted inside the cylinder and has an operative position, seated against the discharge orifice. The operative position is defined when the top of the piston is within a certain distance from the cylinder head. The distance is defined, so that, at the end of the compression stroke of the piston, a determined pressure is reached inside the cylinder, and the pressure results in a force on the piston. The force is opposite to a force which is impelling the piston and which is sufficient to interrupt its compression stroke before impacting the cylinder head.

Abstract: A device for removing water from a pipe for removing water from pipes and the like such that the pipes may be worked on by a plumber includes a housing having a first chamber and a second chamber. A first and a second opening extend into the first chamber. A third opening extends between the first and second chambers. A fourth opening extends into the second chamber. An inlet pipe is fluidly coupled to the second opening. An outlet pipe is fluidly coupled to the fourth opening. A first valve is positioned in the second opening. The first valve is a one-way valve such that fluid may enter the first chamber from the inlet pipe through the second opening. A pump means draws water into the first chamber through the inlet pipe and expelling the water from the first chamber into the second chamber.

Abstract: A compressor has a housing and a cylinder block. The housing includes suction and discharge chambers. The cylinder block is fixed to the housing via a valve plate assembly. The valve plate assembly forms suction and discharge ports and suction and discharge valves. A partition wall is formed with the housing, and separates the suction chamber and the discharge chamber. The housing includes a first surface, and the cylinder block includes a second surface. At least one of the first and second surfaces is concave in shape. The cylinder block is screwed to the housing at the partition wall or a position closer to the central axis of the housing than the partition wall by a bolt so that the first surface faces the second surface.

Abstract: Y-block or right-angular fluid section plunger pump housings have cylinder, suction, discharge and/or access bores which are transversely elongated within transition areas for interface with other bores to provide internal access, stress relief and a reduction in housing weight. A two-piece suction valve spring retainer assembly further reduces stress near the bore interfaces and allows use of a top stem guided suction valve that may be installed without threads in the suction bore. Tapered cartridge packing assemblies facilitate use of a one-piece plunger and also allow packing in such housings to be changed without removing the plunger.

Abstract: A pumping device for drawing in and delivering a liquid to a liquid dispensing device of a hair removing apparatus the pumping device includes a pump inlet and a pump outlet and a pumping element. The pumping device is formed by a first and a second housing part each having integrally formed therein a first and a second flow channel. The pumping device includes a membrane member disposed between the first and the second housing part the membrane member includes a pumping element and at least one valve element. The pump inlet is adapted to be coupled to a liquid dispensing device and the pump outlet to a liquid container.

Abstract: A gas compressor and method according to which a plurality of inlet valve assemblies are angularly spaced around a bore. A piston reciprocates in the bore to draw the fluid from the valve assemblies during movement of the piston unit in one direction and compress the fluid during movement of the piston unit in the other direction and the valve assemblies prevent fluid flow from the bore to the valve assemblies during the movement of the piston in the other direction. A discharge valve is associated with the piston to permit the discharge of the compressed fluid from the bore.

Abstract: A high pressure fuel supply apparatus includes a cylinder defining a compression chamber, a piston supported for sliding movement in the cylinder, and a valve communicating with the compression chamber. The valve includes a valve seat having a valve hole formed therein and a reed movable between an open and a closed position to open and close the valve hole. The reed has a head with an outer periphery in surface contact with the valve seat when the reed is in its closed position, and a bulge surrounded by the outer periphery and extending away from the valve hole and disposed on the valve hole when the 0reed is in its closed position.

Abstract: A compressor piston has protrusions which extend upwardly into discharge ports to minimize clearance at the end of the compression stroke. The protrusions fit into circumferentially isolated discharge ports, and each of the ports are associated with reed valves. Preferably a cutout portion is formed into the piston head to allow clearance for movement of the suction valve. The suction valve is positioned on an inner face of a valve plate and the discharge reed valves are positioned on an outer face. The protrusions are preferably frustro-conical.

Abstract: In a hydraulically driven diaphragm pump with a diaphragm clamped at its edge between a pump body (2) and a pump cover (3), separating a delivery chamber (4) from a hydraulic chamber (5) and pretensioned in the direction of its suction stroke by spring force, and with a hydraulic diaphragm drive in the form of an oscillating displacement piston (6) which is displaceable in the pump body (2) between a reservoir chamber (8) for the hydraulic fluid and the hydraulic chamber (5), characterised in that the diaphragm (1) is so strongly pretensioned by means of spring force that it exerts a substantial compressive force on the hydraulic fluid in the hydraulic chamber (5) and that therefore a substantial overpressure is built up in the hydraulic chamber (5) against the delivery chamber (4).

Abstract: A sealing mechanism is used for a compressor. The compressor has a housing, a valve plate assembly located in the housing. The housing has a cylinder block and a cylinder head. The cylinder block and the cylinder head are connected with each other. The valve plate assembly has a plurality of plates. The sealing mechanism has a seal portion. The seal portion is a peripheral portion of one of the plates that extends radially outward in the compressor relative to the other plates. The seal portion seals a peripheral section between the cylinder block and the cylinder head. This provides an inexpensive and simple sealing mechanism of the compressor.

Abstract: A high pressure fuel pump for an internal combustion engine having a cylinder, a plunger slidably fitted in the cylinder and a seal mechanism for blocking fuel leakage from an end of a sliding portion between the cylinder and the plunger and also for preventing an lubricant for a driving mechanism of the plunger from entering into the cylinder from the end of the sliding portion of the cylinder and the plunger. A holder surrounding the end of the sliding portion of the cylinder and the plunger is provided. The seal mechanism comprises two mutually independent seal devices mounted with a specific spacing in a longitudinal direction from the end of the sliding portion of the cylinder and the plunger along a circumference of the plunger. The two seal devices are held on the circumference of the plunger by the holder surrounding the end of the sliding portion of the cylinder and the plunger while keeping the specific spacing.

Abstract: A variable displacement compressor 10 includes a wall 1a that seals a cylinder bore 14, and is integrally formed with a cylinder block 1. A rear plate 5 having a plate-like shape is fastened via a gasket 6 to a location that extends to the inner rear side of a wall 1a. Suction valves 40 and discharge valves 44 are disposed within the wall 1a.

Abstract: The system includes an appliance for personal body care, a pump and a holder. The appliance comprises a treatment device for carrying out a body-care treatment under the influence of a fluid. The fluid is held in the holder and can be pumped to an outlet opening by means of the pump. The holder includes a flexible wall, and the pump is detachable from the holder and is detachable from the appliance. This combination of measures makes it possible to adapt the dimensions of the holder to an ergonomic shape of the appliance.

Abstract: A suction port of a piston type compressor is formed in the shape similar to a portion of a sector with an apex portion of the sector removed. A distal end portion of a suction valve which can open and close the suction port has a contour line including a distal end forming line extending generally parallel to a distal end line of the suction port, and side lines. A gap between the distal end line of the suction port and the distal end forming line of the suction valve is substantially constant, and a gap between the distal end forming line and the circle of the cylinder bore is substantially constant. The ease of the inflow of a gas when the gas is sucked from the suction port to the cylinder bore is improved.

Abstract: A diaphragm pump with a pump lid, a pump housing and a hydraulically powered diaphragm that is arranged between the former, that delimits a hydraulic chamber from a delivery chamber and that is clamped in a circulating rim. There is provided between the pump lid and the pump housing an insert part, which is located on the side of the pump lid and which limits the delivery chamber and/or an insert part that is located on the side of the pump housing and that delimits the hydraulic chamber, while the diaphragm at its circulating rim is clamped between the insert part and the pump housing or the pump lid or between insert parts.

Abstract: A compressor piston has protrusions which extend upwardly into discharge ports to minimize clearance at the end of the compression stroke. The protrusions fit into circumferentially isolated discharge ports, and each of the ports are associated with reed valves. Preferably a cutout portion is formed into the piston head to allow clearance for movement of the suction valve. The suction valve is positioned on an inner face of a valve plate and the discharge reed valves are positioned on an outer face. The protrusions are preferably frustro-conical.

Abstract: A compressor including a valve plate held between the body and the head with the interposition of a first and a second flat sealing gasket. The compressor further includes a thin-sheet aspiration valve associated with an aspiration hole provided on the valve plate. The entire valve is accommodated within a recessed area provided on a surface of the valve plate that is turned toward the body of the compressor.

Abstract: In the present compressor, a retainer is prevented from being deformed without impairing the sealing performance of a metal gasket provided between a covering member for closing a compression chamber of a cylinder block assembly and a discharge valve forming plate. A discharge valve forming plate is provided between a valve plate having at least one discharge port through which a fluid compressed in a compression chamber of a cylinder block assembly is discharged into a discharge chamber of a housing and the cylinder block assembly. A retainer for restricting the magnitude of opening of a discharge valve is integrally formed in a metal gasket which is provided between the discharge valve forming plate and the housing. The housing is provided with a restricting section at a position corresponding to a proximal portion of a rising portion of the retainer for restricting the proximal portion of the top surface of a rising portion.

Abstract: A combination valve including a metal sleeve and a valve body. The valve body is formed of a resilient material and insert bonded or vulcanized to the metal sleeve and includes a cylindrical elongated member defining a passageway therethrough and an annular umbrella portion integrally extending from the elongated member. The elongated member is disposed within the metal sleeve and has converging flexible lips. The metal sleeve includes a plurality of prongs at one end and the valve body includes a top surface. The prongs of the metal sleeve extend to the top surface of the valve body, whereby the valve can be press-fitted into location without damaging the valve body. Between the prongs of the metal sleeve are gaps which permit the molding material to flow from the umbrella portion to the elongated member during the molding of the combination valve.

Abstract: An object of the invention is to provide a refrigerant compressor which can improve a response of a discharge valve while intending to maintain a strength and a workability of a valve restricting plate and an accuracy of finished shape without increasing a thickness.

Abstract: A fuel pump designed to prevent vapor lock. The pump comprises an inlet check valve located between a pumping chamber and a reservoir. The inlet check valve allows the flow of fluid from the reservoir into the pumping chamber. The inlet check valve is constructed such that when a combination of both liquid and vapor is present in the pumping chamber, the liquid and vapor is allowed to flow from the pumping chamber back into the reservoir; but when the pumping chamber is filled only with liquid, the inlet check valve prohibits flow from the pumping chamber into the reservoir.

Abstract: A head cover assembly for a two cylinder compressor is described. The head cover assembly is mounted over the compressor cylinders and includes a one piece valve plate with a pair of removable heads. The valve plate includes two substantially identical cylinder covers disposed over a pair of plate sections, thereby enclosing a volume above each plate section with a head installed. Each cylinder cover includes a divider wall which divides the enclosed volume of the cover into an intake volume and an exhaust volume. A pair of passageways provides communication between the cylinder covers connecting the exhaust volumes and the intake volumes.

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 hand holdable pump spray apparatus is disclosed where the pump mechanism is in the hand holdable wand rather than in a spaced apart liquid container. The wand may be held with one hand while a pump handle is extended with the other hand. This creates a pressure differential which allows liquid to flow from the container, passed a check valve and into the wand. After filling, a biased spring provides a force against the liquid creating a higher pressure in the wand than ambient pressure. This closes the check valve. When an operator depresses an actuator, another valve opens allowing the liquid in the wand to be ejected through a nozzle.

Abstract: In a head cover structure of a hermetic motor-driving type compressor, by comprising a front head cover having a space divided into a low-pressure side sucking a refrigerant by being installed a suction muffler and a high-pressure side discharging the refrigerant by an enclosure wall and a rear head cover combined to the rear surface of the front head cover and having a space divided into a low-pressure side and a high-pressure side by an enclosure wall, a flatness of the front head cover can be improved, leakage of a refrigerant gas from the high-pressure side can be prevented, and the cost of materials can be reduced by using an inexpensive steel material.

Abstract: A Y-block fluid section plunger pump housing has a cylinder bore which is transversely elongated at its intersection with suction and discharge bores to provide stress relief and a reduction in housing weight. An integral suction valve retainer arm further reduces stress near the bore intersection. Tapered cartridge packing assemblies facilitate use of a one-piece plunger in Y-block housings and also allow packing in such housings to be changed without removing the plunger.

Abstract: A compressor includes a cylinder block having a cylinder bore. A valve plate assembly is located between the cylinder block and a rear housing. The valve plate assembly includes a plurality of plates. The rear housing is connected with the cylinder block through the valve plate assembly. A pair of pins engage all the plates to determine the position of the valve plate assembly relative to at least one of the cylinder block and the rear housing.

Abstract: Disclosed herein is a disposable combination pump/filter assembly to simultaneously dispense and filter aseptic solutions. The disposable pump and filter assembly includes a piston assembly incorporating a piston rod and a piston head, a pump head assembly with inlet and outlet ports, a vacuum chamber, a rolling diaphragm seal, a filter element, intake and discharge valve mechanisms, flexible intake/discharge tubing, and a clamping assembly that holds the head, diaphragm, and vacuum chamber together. The assembly minimizes the total number of individual parts that make up the pump and filter assembly, as well as the cost to manufacture.

Abstract: A reciprocating piston compressor is provided, including a crankcase having a cylinder, the cylinder having an opening in an exterior surface of the crankcase. A valve assembly including a suction leaf plate covers the cylinder opening. A flexible suction leaf valve is defined by a slot in the suction leaf plate, and the suction leaf valve includes a base integral with the suction leaf plate and a tip opposite the base. The slot has a width which is reduced from a maximum distance at the base to a minimum distance at the tip.

Abstract: A mechanically actuated diaphragm pump for pumping fluids includes a pump head body having an outer surface, a pumping cavity, an inlet, an outlet, and suction and discharge valves. The suction and discharge valves are externally mounted on the pump head body and are slidably removable in a direction perpendicular to the direction of fluid flow to or from the pump.

Abstract: A high pressure fuel supply apparatus includes a cylinder defining a compression chamber, a piston supported for sliding movement in the cylinder, and a valve communicating with the compression chamber. The valve includes a valve seat having a valve hole formed therein and a reed movable between an open and a closed position to open and close the valve hole. The reed has a head with an outer periphery in surface contact with the valve seat when the reed is in its closed position, and a bulge surrounded by the outer periphery and extending away from the valve hole and disposed on the valve hole when the Oreed is in its closed position.

Abstract: A piston assembly for a compressor that reduces the temperature experienced by a compressor cup seal during operation of the compressor. The piston assembly includes a piston sleeve having a top portion and an interior. A valve plate is supported by the top of the piston sleeve. A compressor head includes a compressor head plate, which is offset from the valve plate. The offset between the compressor head plate and the valve plate defines a cooling chamber. The interior of the piston sleeve communicates with the interior of the compressor head via openings defined in the valve plate and the compressor head plate and conduit associated with these opening and traversing the cooling chamber.