Abstract: The reciprocating compressor has a cylinder with a compression chamber where a piston can slide between a crank-side position and a head-side position; a piston rod is mechanically connected to the piston and during operation of the compressor, slides in a hole of the compression chamber; there is a small gap between the hole and the piston rod; in order to avoid leakage from this gap a jacket is arranged around the piston rod and is sealed on one side to the piston and on the other side to the cylinder at the gap.

Abstract: A pump includes a reservoir, a port, and a plunger. The reservoir delivers a liquid by discharging the liquid through the port coupled to the reservoir. A piston of the plunger defines a liquid side of the reservoir and a non-liquid side of the reservoir whereby movement of the plunger towards the liquid side of the reservoir discharges liquid through the port. The pump also includes a reference-volume assembly and/or a linear position sensor. The reference-volume assembly is coupled to the reservoir at an opposite end of the reservoir relative to the port and includes a reference-volume chamber in acoustic communication with the non-liquid side of the reservoir, a speaker disposed within the reference-volume chamber, and a reference microphone disposed within the reference-volume chamber. The pump estimate the amount of liquid discharged from the reservoir.

Abstract: A linear compressor includes a shell including an intake pipe configured to suction a refrigerant, a cylinder provided inside the shell, a piston configured to reciprocate inside the cylinder, the piston including a piston body and a piston flange, and an intake muffler coupled to the piston and configured to flow a refrigerant suctioned through the intake pipe into the piston body and reduce a flow noise of the suctioned refrigerant. The intake muffler includes a first muffler disposed in the piston body, a second muffler disposed below the first muffler and configured to communicate with the first muffler, and a third muffler configured to accommodate a portion of a rear end of the first muffler and the second muffler.

Abstract: An air pump is provided, the air pump comprising: an air pump housing; a first check valve; a main air pump; an airway switching device; an air-supplementing pump; an air pressure sensor; and a control device. The control device is electrically connected to the main air pump, the airway switching device, the air-supplementing pump, and the air pressure sensor, and is configured to: send a main air pump stop signal based on the air pressure sensor detecting a threshold pressure in the inflatable body during operation of the main air pump; and send an air-supplementing pump operation signal based on the air pressure sensor detecting a pressure lower than the threshold pressure in the inflatable body when the main air pump is not in operation.

Abstract: A fuel supply device includes: a sub-tank to be fixed on a bottom of a fuel tank, the sub-tank temporarily storing fuel in the fuel tank, an upper side of the sub-tank having an opening; a bracket attached to an opening side of the sub-tank; an electric pump that pumps up the fuel in the sub-tank and supplies the fuel to outside of the sub-tank; and multiple fitting portions arranged on an outer edge of the bracket and to fix the bracket to the sub-tank by being fitted to a plurality of receiving portions arranged on the opening of the sub-tank.

Abstract: A method is provided for detecting leaks in a disposable medical fluid cassette that includes a base and a flexible membrane attached to the base in such a way that the base and the flexible membrane cooperate to at least partially form a fluid passageway. The method includes applying a first force to the flexible membrane, measuring a first physical property of a system that includes the medical fluid cassette a medical fluid pumping machine, removing the first force from the flexible membrane, applying a second force to the flexible membrane, measuring a second physical property of the system, and determining whether the medical fluid cassette leaks based on a comparison of the first physical property and the second physical property.

Abstract: A vacuum suspension system includes a foot cover having a heel portion and a pump system located in the heel portion. The pump system includes upper and lower sections arranged to move in an axial direction relative to one another and a pump mechanism operatively connected to and positioned between the upper and lower sections. When the heel portion is loaded in stance the pump mechanism moves from an original configuration in which the volume of a fluid chamber defined by the pump mechanism is zero or near-zero, to an expanded configuration in which the volume of the fluid chamber is increased.

Abstract: A hydraulic block for a hydraulic power vehicle brake system including a slip control. A bore, which communicates through a circumferential groove with a receptacle of a pedal travel simulator, is run through parallel to a motor side of the hydraulic block between the motor side and a master brake cylinder bore in the hydraulic block and is connected through a transverse bore with a further bore parallel to the motor side, which connects the master brake cylinder bore with a connection for a pressureless brake fluid reservoir, which is attachable to the hydraulic block. The bores form a return of the pedal travel simulator, which has a low resistance to flow and allows for a closed system.

Abstract: A fluid pump apparatus for an artificial lift system has a barrel, a standing valve positioned at a lower end of the barrel so as to be movable between an open position and a closed position, a plunger reciprocatingly mounted in the barrel, a traveling valve positioned in an interior of the plunger so as to control fluid flow through the plunger, and a pilot slidably positioned in the plunger. The plunger has a first aperture at an upper portion thereof and a second aperture extending through a wall of the plunger so as to open to a channel extending through the channel. The traveling valve is slidably movable within an interior of the plunger. The plunger has a seat that is cooperative with a surface of the traveling valve. The pilot is cooperative at the surface of the traveling valve so as to move the traveling valve.

Abstract: A high-pressure fuel pump for a fuel injection system of an internal combustion engine includes a pump housing and at least one fastening flange that is fixed to the pump housing by a welding. The welding has one weld region and at least one weld bead arranged laterally from the weld region. The weld bead is arranged in a receiving space formed between the pump housing and the fastening flange.

Abstract: Hydraulic pressure booster and method includes a low-pressure segment including a hydraulic cylinder and a hydraulic piston, which is displaceable in both axial directions of the hydraulic cylinder and opposing high-pressure segments located on each axial end of the low pressure segment. Each high-pressure segment includes a plunger piston movable in a high-pressure cylinder via the hydraulic piston. Each high-pressure cylinder is arranged in a clamping sleeve, both of which are positioned between the hydraulic cylinder and a valve body. For each high-pressure segment, a clamping piston, which includes a pressure surface applying pressure to the high pressure cylinder and a high pressure seal for the plunger piston and a pressure surface on which pressure from the hydraulic piston is applied, is axially displaceable in the hydraulic cylinder so that the high-pressure cylinder is in compressive contact with the hydraulic cylinder and the valve body.

Abstract: A high-pressure fuel supply pump comprising a suction valve disposed on a suction side of a pressurizing chamber, an engagement member having a protrusion part that protrudes toward the outer periphery and biasing the suction valve by use of the force of a spring, a stator for generating a magnetic attraction force, and a plunger drawn by the magnetic attraction force and driving the engagement member toward the stator by engaging with the protrusion part, the fuel supply pump being configured so that the area of the fuel passage is smallest between the outer periphery of the protrusion part and the inner periphery of the plunger, and so that a tapered section whereby the area of the flow path increases from the portion where the area of the passage is smallest toward the pressurizing chamber or toward the suction valve side is formed.

Abstract: Systems and methods are disclosed herein for an inflation pouch. The inflation pouch may include a border on a first end and a nozzle on a second end, wherein the border defines an interior volume of the inflation pouch, and the interior volume is in fluid communication with the nozzle. The border further comprises a zipping fastener or a hook and loop fastener. The nozzle may couple with an inflation valve of an inflatable structure. The interior volume of the inflation pouch is in fluid communication with an interior volume of the inflatable structure.

Abstract: A vacuum suspension system includes a foot cover having a heel portion and a pump system located in the heel portion. The pump system includes upper and lower sections arranged to move in an axial direction relative to one another and a pump mechanism operatively connected to and positioned between the upper and lower sections. When the heel portion is loaded in stance the pump mechanism moves from an original configuration in which the volume of a fluid chamber defined by the pump mechanism is zero or near-zero, to an expanded configuration in which the volume of the fluid chamber is increased.

Abstract: A cardiac assist device is provided. The cardiac assist device may comprise a structure surrounding at least a portion of a heart. The cardiac assist device may comprise an inner cup enclosing at least a portion of the structure. The cardiac assist device may comprise an outer cup enclosing at least a portion of the inner cup. The outer cup may comprise an opening. Gas may be conducted into a space between the outer cup and the inner cup, using a pump, to cause a first motion of the structure, associated with a first rotation of a first portion of the heart in a first direction. The gas may be conducted from the space to outside of the outer cup, using the pump, to cause a second motion of the structure, associated with a second rotation of the first portion of the heart in a second direction.

Abstract: A pump for extraction of water, petroleum or other fluids from thousands of meters of depth is a reciprocating pump that reduces the incidence of piston seizures and, furthermore, gas locks that block fluid from entering the pump. When the pump is introduced into a well casing or tubing, a sleeve of the pump latches to the well casing or tubing and allows a hollow piston to travel therein in a reciprocating motion for fluid extraction. A traveling valve is located in the hollow piston and fixed valve is seated in the well casing or tubing. The sleeve length is less than the length of the hollow piston. In a preferred embodiment, passages are provided for releasing gases.

Abstract: The fluid-cushion sealing device (100) for a piston (101) moving in a cylinder (102) and defining with the latter a chamber to be sealed (104) includes: a continuous perforated ring (105) through the radial thickness of which passes a calibrated opening (111) and which is sealingly accommodated in a ring groove (109) provided in the piston (101) so as to define, with the groove (109), a pressure distribution chamber (119) connected to a pressurized fluid source (112), while an axially blind counter-pressure recess (115) is provided recessed on an external cylindrical ring surface (107) which faces the cylinder (102) and which the continuous perforated ring (105) includes, the calibrated opening (111) leading into the recess (115).

Abstract: A fluid pump apparatus for an artificial lift system has a barrel, a standing valve positioned at a lower end of the barrel, a plunger reciprocatingly mounted within the barrel, and a traveling valve positioned in an interior of the plunger so as to control fluid flow through the plunger. The barrel has an opening at a top thereof and an opening at a lower end thereof. The standing valve is movable between an open position and a closed position. The plunger has a first aperture at an upper portion of the plunger and a second aperture extending through a wall of the plunger so as to open to a channel extending longitudinally through the plunger. The traveling valve has a head portion of the body extending downwardly from the head portion. The body is slidably movable within an interior of the plunger. The body has a fluid-passing channel therein that opens to an exterior of the body.

Abstract: There is provided a device for automatic synchronized injection and aspiration of fluids comprising: a first linear actuator; a second linear actuator; a first coupling mechanism attached at a distal end portion of the first linear actuator, the first coupling mechanism arranged for detachable coupling to a first plunger of a first syringe; a second coupling mechanism attached at a distal end portion of the second linear actuator, the second coupling mechanism arranged for detachable coupling to a second plunger of a second syringe; and a synchronization mechanism mechanically coupled to the first and second linear actuators, the mechanism arranged so that insertion of the first plunger further into a first barrel of the first syringe is synchronized with extraction of the second plunger from a second barrel of the second syringe, thereby injection from the first syringe is synchronized with aspiration into the second syringe.

Abstract: A device for releasing reactant (R) into the exhaust gas stream (A) of an internal combustion engine, includes a reactant injection unit (20), a reactant delivery unit (12) for delivering reactant (R) from a reactant reservoir (14) to the reactant injection unit (20), and a heating unit (18) for heating reactant (R) delivered by the reactant delivery unit (12) to the reactant injection unit (20). The reactant injection unit (20) is switchable as a function of a reactant pressure generated by the reactant delivery unit (12) between an open state for releasing reactant (R) and a locked state for preventing the release of reactant.

Abstract: A diaphragm type fuel pump includes a rod, one end of which is coupled to a diaphragm, a plunger which is slidably fitted with respect to the other end of the rod, and a plunger biasing member which biases the plunger toward the other end of the rod. The other end of the rod has a first pin extending outward radially. A through hole extends through the plunger in a radial direction. The through hole has a size which allows the first pin to move in a longitudinal direction of the rod. The first pin is in contact with one edge of the through hole. A gap is formed between another edge of the through hole and another end surface of the rod. A second pin in parallel to the first pin can be fitted into the gap.

Abstract: A plunger fuel pump for an internal combustion engine includes a pump cylinder and a pump plunger that is axially displaceable in the pump cylinder. The plunger fuel pump has a seal with an annular basic structure arranged around the circumference of the pump plunger. The seal is produced by injection molding in an axial injection direction.

Abstract: Methods and apparatus for position sensitive dampening. In one aspect a fluid damper is provided comprising a damper chamber divided by a piston into a primary compression and a primary rebound chamber; a secondary compression chamber in fluid communication with the damper chamber; and an adjustable fluid meter controlling fluid flow out of the secondary compression chamber.

Abstract: A high pressure pump for delivering a fluid includes a pump housing with a longitudinal axis and a housing cavity, a piston partly arranged in the housing cavity and axially moveable within the housing cavity and having an axial end directed opposite a driving side of the high pressure pump, and a sealing unit having a sealing body arranged radially outside of the piston such that a first part of the housing cavity is sealed fluid-tight against a second part of the housing cavity. The sealing body includes a neck with an inner diameter smaller than a first diameter of a part of the piston arranged between the sealing body neck and the axial end of the piston. The piston has a second diameter in an axial area in which the sealing body neck is arranged, which second diameter is smaller than the first diameter.

Abstract: The invention relates to a pressure vessel comprising a heat exchanger for a cryogenically stored medium, especially for use in a motor vehicle, especially for use as a pressure tank for hydrogen. Said pressure vessel includes a cylindrical jacket and rounded-off end faces which are rolled onto the ends of the jacket and which have centrally arranged openings closed by welded-in inserts, at least one first insert having filling and removal devices. The invention is characterized in that the inserts form bearings on which at least one in-tank heat exchanger is mounted.

Abstract: Disclosed is a device and method for repairing a partially or totally ruptured tendon. The device comprises an implant placed inside or outside of the tendon on either side of the rupture in order to strengthen the ruptured area during repair. Once positioned inside the tendon, the tendon is held in place so it can heal either by sewing or stapling through the tendon and implant, or by any other suitable method that utilizes the implant to provide strength to the ruptured area. In this manner the tendon can heal with less chance of rupturing again prior to healing.

Abstract: A flow chamber and method for detecting the presence of one more cell produced analytes under flow conditions. The flow chamber includes two compartments separated by a permeable membrane on which a plurality of cells may be positioned. The permeable membrane shields one or more analyte sensors positioned one compartment from the convective transport forces of a fluid flow within the other compartment to allow reliable and accurate detection of cell-produced analytes and determination of the concentration of cell-produced analytes.

Abstract: A mechanical system forming a cam follower or a rocker arm; the mechanical system including a support element, a pin extending between two opposite ends along a first axis and supported by the support element, and a roller mounted on the pin, movable in rotation relative to the pin around the first axis and adapted to roll on a cam. The mechanical system further includes an insert made from separate parts and including holding members supporting the pin ends.

Abstract: A high-pressure pump includes a plunger, a cylinder, a pressuring chamber, a pump body, a main fuel chamber, an auxiliary fuel chamber and a return passage. The cylinder slidably houses the plunger therein. Fuel is pressurized inside the pressurizing chamber by sliding movement of the plunger. The pump body houses the cylinder and has an end surface on an opposite side of the pump body relative to the pressurizing chamber in an axial direction. The main fuel chamber is disposed inside the pump body into which fuel is supplied. The auxiliary fuel chamber has a side defined by one end of the cylinder on an opposite side of the cylinder relative to the pressurizing chamber. The return passage is disposed inside the pump body and is in fluid communication with an external cooling unit.

Abstract: A pumping device includes a frame body, a pump body, a piston rod, a drive shaft, a main guiding member, a carrier block, a plug unit, and a rotary-to-linear motion conversion mechanism disposed between the carrier block and the drive shaft so as to convert rotation of the drive shaft to linear motion of the carrier block. A shaft axis of the drive shaft and a piston axis of the piston rod cooperatively define a vertical plane. A bottom surface of the carrier block is guided by the main guiding member and defines a bottom plane which is orthogonal to the vertical plane.

Abstract: A pump assembly for use within a high pressure pumping system includes housing, a head and a base. The housing contains at least one centrifugal pump stage. The head and base are attached to the housing with corresponding internal threaded connections. The head and base are further retained to the housing with corresponding external flanged connections. The external flanged connections provide redundant connections that reduce the risk of separation between the housing and the head and base.

Abstract: A high-pressure fuel pump includes a pump housing, a pressurizing member, a suction valve seat, a suction valve body, and a suction valve chamber. The suction valve seat includes a first projected wall section that is projected to an upper side in a vertical direction. The pump housing includes a second projected wall section that is directed to the upper side in the vertical direction. A height of the lowest position in a portion of the second projected wall section that is projected to the upper side in the vertical direction is higher than a height of the lowest position in a portion of the first projected wall section that is projected to the upper side in the vertical direction. A first initial fuel pool is provided on an downstream side of the second projected wall section and on the upstream side of the suction valve seat.

Abstract: A micropump and a disposable pump body thereof are disclosed. The micropump includes the pump body and an actuator device. The pump body includes a chamber, an inlet communicating with the chamber, an outlet communicating with the chamber and a covering membrane on top of the chamber. The actuator device includes an actuator and a transmitting post. One of the two ends of the transmitting post connects to the actuator. The other end of the transmitting post abuts against the membrane. Since the pump body is separated from the actuator device, the pump body is disposable and can be replaced after use to avoid cross-infection of disease, particularly useful for medical liquid delivery.

Abstract: Hydraulic pump distributor sealing ring (1) for a hydraulic distributor (2) of a hydraulic pump (44), includes a continuous sealing ring (11) housed in a ring groove (16) formed in a pump stator (3) whose inlet-delivery ports (7) are each aligned with a distribution opening (21) passing right through the ring (11) in the direction of its thickness, this ring including a circumferential-contact boss (14) which has a circumferential line of contact (15) that can come into contact with a rotor-side low-pressure sealing surface (13), the ring (11) also including a compression-decompression track (24), a ring sealing lip (39) that provides sealing between the ring (11) and the ring groove (16), and rotation-proofing elements (36).

Abstract: Disclosed herein is a valve assembly for a variable swash plate compressor. Since an opening hole of a suction reed is enlarged toward a suction port of a valve plate and refrigerant is also introduced into a cylinder bore through the opening hole when the suction port is opened, performance of a compressor may be enhanced by an increase in flow rate.

Abstract: A fuel pump is disclosed. The fuel pump includes a housing. Further, the fuel pump includes a rotatable pump shaft disposed within the housing. One end of the rotatable pump shaft is attachable to a gear. The housing also includes a retainer disposed within the housing and located about the pump shaft. The retainer includes a first rim and a second rim that are spaced apart from each other. The retainer also includes a side wall extending between the first and the second rims. Further, the side wall of the retainer defines a first volume and a second volume within the housing. The side wall of the retainer has a plurality of apertures configured to allow a fluid flow from the first volume to the second volume while retaining particulate contaminants larger than a size of the apertures within the first volume.

Abstract: Embodiments of the present invention relate generally to heat-exchanger systems that can be used to heat or cool a fluid such as blood. Pod pumps that provide low shear and low turbulence may be used in such systems, particularly for systems that pump blood. A certain heat-exchanger system used to heat blood or other fluids may be used to provide whole-body hyperthermic treatments or regional hyperthermic chemotherapy treatments. A disposable unit may be used to separate the fluid path from the fluid control systems. The disposable unit typically includes a heat-exchanger component that is received by a corresponding heat exchanger in a base unit. Fluid pumped through the heat-exchanger component is heated by the heat exchanger.

Abstract: A sliding inflator with inner and outer cylinders is provided. The outer cylinder has a fixing element with an axial pipe protruding therefrom and having two through holes. A rotating element is disposed around the axial pipe and has two receiving chambers matching the through holes, respectively, and receiving a ball each. A gradually-deepened curved portion of the receiving chamber is defined between shallow and deep ends thereof. The rotating element rotates between an unlocked position and a locked position. A stopping element is fixed to the inner cylinder and has a protruding post with an annular groove. The rotating element switches from the unlocked position to the locked position to couple the cylinders together, and switches from the locked position to the unlocked position to release engagement between the cylinders.

Abstract: A reciprocating cryogenic pump 2 comprises a piston reciprocable within a pumping chamber 44. The pumping chamber 44 has an inlet suction valve 48 for cryogenic liquid to be pumped and an outlet 32 for high pressure cryogenic liquid. The inlet valve 48 for the cryogenic liquid communicates with a cryogenic liquid reception chamber 46 in the cold end or head 6 of the pump 2. The pump head 6 is at least partially surrounded by a first jacket 8 retaining primary vacuum insulation. The first jacket 8 is itself at least partly surrounded by a second jacket 10. The jacket 10 defines a chamber for the reception of a coolant fluid such as liquid nitrogen and the second jacket has an inlet 20 and an outlet 22 for the liquid nitrogen. The thermal insulation can be further enhanced by a trapped gas space 73 between the first jacket 8 and an inner sleeve 52, the latter defining with an outer sleeve 50 vacuum insulation for the pumping chamber 44.

Abstract: The present disclosure relates to a hermetic compressor with a discharge pulsation reducing member mounted therein, the hermetic compressor including a case; a cylinder block disposed in the case; a discharge muffler disposed on the upper portion of the cylinder block and having a first chamber and a separate second chamber to reduce the pulsating components of the discharged refrigerant, the first chamber and the second chamber being connected to each other by a connection passage inside the discharge muffler; and the discharge pulsation reducing member fixed in the connection passage and having a pulsation reducing passage formed along the outer peripheral surface thereof.

Abstract: A piston head for a syringe pump comprises a barrier portion (11) for driving fluid through a syringe pump barrel (30), wherein a peripheral section (13,14) of the barrier portion (11) is shaped to seal against the syringe pump barrel (30); and a re-silent member (15) arranged to resist deformation of the shaped peripheral section (13,14) of the barrier portion (11).

Abstract: A cylinder cover for alternative compressor comprises a block (1) provided with at least a sealing contour (11) and at least a support projection (3) for supporting a discharge valve stop. Said support projection (3) is spaced from the sealing contour (11) through at least one gap (4).

Abstract: A fluid end assembly comprising a fluid end housing with multiple discharge manifold ports. Embodiments of the disclosure provide a fluid end assembly that overcomes problems associated with prior art single port discharge manifold designs that result in non-symmetrical flow of discharged fluids through the fluid end discharge valves, resulting in premature failure of said valves. The multiple port manifolds of the present disclosure overcome problems associated with non-symmetrical flow of discharged fluids through a fluid end discharge valve, thereby improving valve life and performance.

Abstract: A valve seat member which partitions between a supply passage and a pressurizing chamber, includes an inner flow path, which communicates between the supply passage and the pressurizing chamber, and an outer flow path, which is placed on a radially outer side of the inner flow path. An inner valve is seatable against inner valve seat formed in an opening of the inner flow path. An outer valve is contactable with an end surface of the inner valve, which is opposite from the inner valve seat. The outer valve is seatable against an outer valve seat, which is formed in an opening of the outer flow path.

Abstract: A wear-resistant air pump includes a cylinder, a piston and rod set inserted in the cylinder and movable back and forth between two opposite ends of the cylinder, an air nozzle head located at one end of the piston and rod set outside the cylinder and opposite to the piston of the piston and rod set and adapted for connection to an air valve of an inflatable object, and a wear-resistant structure provided between the piston and the cylinder for bearing a relative reciprocating motion between the piston and the cylinder to prolong the lifespan of the air pump.

Abstract: In an oil pump for an automatic transmission, a suction port is adapted to be connected to a first suction passage. The first suction passage is arranged in parallel with a second suction passage connected to an auxiliary pump. The first and second suction passages branch from an upstream suction passage leading to an oil strainer. A discharge outlet is adapted to be connected to a first discharge passage. An air vent hole is disposed downstream of the suction port and upstream of the discharge outlet. A communication passage is connected to the air vent hole and adapted to reach a predetermined oil level in an oil pan so as to communicate the air vent hole with inside of oil in the oil pan.

Abstract: A piston pump for a high-pressure cleaning appliance is provided, including a pump block having a plurality of pump chambers, into each of which one piston plunges, and including a pump head having a suction inlet and a pressure outlet, each pump chamber in flow connection via a suction valve with the suction inlet and via a pressure valve with the pressure outlet, and including a clamping bracket engaging around the pump head. The piston pump can have a single U-shaped clamping bracket oriented symmetrically in relation to the longitudinal pump axis, and the pump head and the pump block form between them downstream of the pressure valves a pressure chamber in which a central, piston-like insert part is arranged, the insert part being surrounded by a sealing element and having a passage, and a pressure line oriented coaxially with the longitudinal pump axis being arranged downstream of the passage.

Abstract: A pump including a cylinder body having first and second ends and a cylinder bore, a plug shaft including first and second ends and a plug shaft bore, wherein the first end of the plug shaft is fixed relative to the cylinder body, and wherein the second end of the plug shaft includes a stop, a first piston received within the cylinder bore to partially bound a first gas chamber and a hydraulic fluid chamber, the first piston being received over the plug shaft and axially moveable relative to the plug shaft, a socket shaft including first and second ends and a socket shaft bore, the socket shaft bore being configured to sealingly receive the plug shaft, a second piston received within the cylinder bore to partially bound a second gas chamber and the hydraulic fluid chamber, the second piston being connected to the socket shaft.

Abstract: A pump system that has a power end and a fluid end assembly. The fluid end assembly includes a plunger configured to translate within a plunger bore. The fluid end further includes a suction valve assembly and a discharge valve assembly. The power end is configured to use a pony rod to induce movement of the plunger within the fluid end assembly to generate a pressure differential. The suction valve assembly and the discharge assembly operate in response to the pressure differential to move the fluid. A straight valve seal is located within the suction valve assembly and/or the discharge valve assembly to distribute forces incurred by movement of valves within the fluid end assembly.

Abstract: A fluid end 15 for a multiple reciprocating pump assembly 12 comprises at least three plunger bores 61 or 91 each for receiving a reciprocating plunger 35, each plunger bore having a plunger bore axis 65 or 95. Plunger bores being arranged across the fluid head to define a central plunger bore and lateral plunger bores located on either side of the central plunger bore. Fluid end 15 has suction valve bores 59 or 89, each suction valve bore receiving a suction valve 41 and having a suction valve bore axis 63 or 93. Discharge valve bores 57 or 87, each discharge valve bore receiving a discharge valve 43 and having a discharge valve bore axis 63 or 93. The axes of at least one of suction and discharge valve bores is inwardly offset in the fluid end from its respective plunger bore axis.