Abstract: The invention relates to a damper device for a piston pump. The device includes a partly air-filled, upright tube (1) placed on the inlet conduit (2) of the piston pump, and a partly air-filled, upright tube (3) placed on the outlet conduit (4) of the piston pump. The two upright tubes (1, 3) are interconnected with each other by means of a tube (5) on which a shut-off valve (6) is disposed. Each of the upright tubes (1, 3) is connected to a blower valve (7, 8), respectively. Both of the blower valves (7, 8) are connected to a common compressed air source. The damper device may be adapted in a simple manner for aseptic operation and/or elevated product pressure.

Abstract: A rotary vane device for hydraulic transmission of mechanical energy with industrial scale measures of power and rotational velocity. The device offers high measures of both volumetric efficiency and rotational velocity and hence substantial measures of functional excellence in terms of power density and functional efficiency. Additionally the device functions without the use of reciprocating primary components and for this reason potentially offers substantial measures of excellence in terms of enhanced operational reliability and relatively low measures of radiated mechanical noise and vibration.

Abstract: An oscillating displacement pump, particularly a diaphragm pump (P) for liquid or gaseous delivery media, having a delivery space which on the one side is delimited by a pump head and on the other side by a delivery element, particularly formed by a diaphragm (6). The delivery element is drivingly connected to an eccentric drive, and an inlet valve connected to an inlet connection and an outlet valve connected to an outlet connection are connected to the delivery space. The pump has a pulsation damper (45) on the pressure side, and also an excess pressure limiting device (27) between the pressure and suction sides, these devices being integrated into the pump head. In use as a liquid pump, an oscillation chamber (16) is integrated into the suction side of the pump head. Pressure peaks are thereby diminished both on the suction side and the pressure side, and a pressure rise on the pressure side is limited to a predeterminable value.

Abstract: A fuel delivery module for supplying fuel to an automobile is disclosed. The fuel delivery module has a receptacle for containing a supply of fuel. Further, the receptacle has a curved sidewall. A pump is positioned within the receptacle wherein the pump generates an acoustical wave having a known frequency. The pump having a pump inlet and wherein the pump inlet is located a 1/4 wavelength of the acoustical wave from the curved sidewall. A receptacle lid is configured to mate with the receptacle to define a closed volume.

Abstract: A reciprocating compressor of un-lubricating type, equipped with a cooling device including a cooling fan beneath a motor and provided with four gas compressors, each having a cylinder and a piston. The pistons of each gas compressor cooperate by converting a rotating motion of a crankpin of a crankshaft provided on an electric drive source via two yokes having a phase difference of 90 degrees therebetween to a reciprocating motion by a scotch yoke mechanism. The flows of compressed gases from each gas compressor are joined to one place by connecting tubes to be discharged. The lengths of each connecting tube are selected such that pressure waves of the compressed gases compete with each other at the joining point for a time period encompassing one rotation of the crankpin, whereby a pulsation resulting from gas flow discharged in concentration is decreased.

Abstract: The present invention relates to an ABS pump housing. The ABS pump housing includes: a motor-receiving unit, a pump-receiving unit, an entrance solenoid valve, an exit solenoid valve and an accumulator-receiving unit, wherein the accumulator-receiving unit comprises: a first chamber, a second chamber arranged above the first chamber and having a diameter smaller than that of the first chamber, a first communication port for communicating the first chamber with the pump-receiving unit and a second communication port for communicating the second chamber with an exit solenoid valve-receiving unit in a rear end of the pump housing. A flow path of the first communication port communicating with the pump-receiving unit is readily formed in a large size. The second chamber is formed to communicate with the exit solenoid valve in the exit side so that any additional communication port is not necessary, by which the pump housing is downsized and light-weighted.

Abstract: A reciprocating compressor comprising a main frame disposed inside a case to support an electrically-driven unit, a cylinder block connected with the main frame 100 and having a compression chamber, a cylinder head having a refrigerant discharge chamber and connected with the cylinder block to seal the compression chamber, a first chamber formed at one side of the cylinder block to be connected with the refrigerant discharge chamber, a second chamber connected with a refrigerant discharge pipe being formed at other side of the cylinder block, and a gasket disposed between the main frame and the cylinder block having a groove forming a connecting path connecting the first chamber and the second chamber. Discharge pulsation is reduced as the compressed refrigerant flows to the first chamber, the connecting path, and the second chamber before being discharged through the refrigerant discharge pipe.

Abstract: In a fluid-pumping system comprising a pump and a pulsation dampener, which is arranged to dampen pressure pulsations, the pump is driven by air delivered at a regulated pressure. The pulsation dampener is arranged to be charged via an associated regulator, which is arranged to regulate the charging air pressure by reference to the air pressure in an averaging tank. Preferably, the pulsation dampener comprises two apertured walls, between which a diaphragm is mounted, one such wall being mounted so as to limit displacement of the diaphragm toward the air-side chamber and the other wall mounted so as to limit displacement of the diaphragm toward the fluid-side chamber. Two similar dampeners may be employed, one to dampen pressure surges and the other to dampen pressure drops.

Abstract: A simple structured high-pressure fuel pump.

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 fuel feed system capable of feeding a fuel to fuel injection valves at a fuel pressure with improved stability is provided. A fuel feed system for an internal combustion engine including a fuel tank and a low-pressure pump for feeding the fuel in the fuel tank to fuel injection valves, is provided with a diaphragm type damper having a wave-shape cross section at a position in contact with the fuel.

Abstract: It is an object of the invention to, even in the case where liquid containing a sedimenting material such as slurry is used, prevent sedimenting and aggregation from occurring in a pump. As means for attaining the object, a bellows 7 that is extendingly and contractingly deformable in the axial direction is placed in a pump body 1 with setting the axis B of the bellows vertical so as to be driven to perform extending and contracting deformation, and form a liquid chamber 9 inside the bellows 7. A suction port 18 and a discharge port 19 are formed in an inner bottom face 4a of the pump body 1 facing the liquid chamber 9. Liquid is sucked from the suction port 18 into the liquid chamber 9 by extension of the bellows 7, and the liquid in the liquid chamber 9 is discharged from the discharge port 19 by contraction of the bellows 7. The inner bottom face 4a is formed into a conical shape in which the face is downward inclined as moving toward the discharge port 19.

Abstract: In a fluid-pumping system comprising a pump and a pulsation dampener, which is arranged to dampen pressure pulsations, the pump is driven by air delivered at a regulated pressure. The pulsation dampener is arranged to be charged via an associated regulator, which is arranged to regulate the charging air pressure by reference to the air pressure in an averaging tank. Preferably, the pulsation dampener comprises two apertured walls, between which a diaphragm is mounted, one such wall being mounted so as to limit displacement of the diaphragm toward the air-side chamber and the other wall mounted so as to limit displacement of the diaphragm toward the fluid-side chamber. Two similar dampeners may be employed, one to dampen pressure surges and the other to dampen pressure drops.

Abstract: A compressor includes a cylinder block, a chamber housing, a drive shaft, a piston, and a cam mechanism. The cylinder block has a plurality of cylinder bores and a muffler chamber. The muffle chamber is formed within the cylinder block in a space between the cylinder bores. The chamber housing is secured to one end of the cylinder block and has at least a pair of a suction chamber and a discharge chamber located near each of the cylinder bores. The discharge chamber communicates with the muffler chamber. The drive shaft is rotatably supported in the cylinder block. The piston is disposed in each of the cylinder bores for compressing gas to generate compressed gas. The cam mechanism converts rotation of the drive shaft to reciprocating movement of the piston. In the present invention, pressure pulsations are suppressed without increasing the compressor in size even when the high-pressure refrigerant such as carbon dioxide is applied.

Abstract: A discharge apparatus for reciprocating compressor, wherein the compressor comprising: a shell connected to a gas suction conduit for sucking gas; a cylinder in the shell; a compression unit including a piston performing reciprocal movement in the cylinder; a reciprocating motor having an inner stator, an outer stator, and a armature performing reciprocal movement between them; and a frame unit for supporting the compression unit and the reciprocating motor by connecting them, consist of: a first cover member in which a valve body controlling the discharge of compressed gas by switching the cylinder in contained and at least a gas passage is formed; and a second cover member arranged continuously with the first cover member and connected to the gas discharge hole, thereby gas compressed by linear reciprocal movement of the piston in the cylinder is discharged smoothly so the reliability of the compressor operation is improved.

Abstract: An introduction passage is formed in a rear housing. The introduction passage extends from a wall of the rear housing across a discharge chamber to a suction chamber. The introduction passage has a first portion extending from an opening portion of the rear housing along a wall of the discharge chamber and along a wall of the suction chamber to the suction chamber. A second portion of the passage bends in the suction chamber substantially perpendicularly and then extends toward a valve plate of a compressor. The outlet of the introduction passage is located closer to the valve plate than to the wall of the suction chamber. Therefore, generation of suction pulsation is suppressed without increasing the size of the compressor.

Abstract: A swash plate type compressor used for the air conditioner of an automobile is presented. The compressor has a structure where pulsation pressure caused when refrigerants are compressed and discharged is reduced, thereby permitting noise at the time of driving to be substantially reduced. The compressor can embody the structure by distributing and discharging refrigerant that has been compressed by a plurality of pistons and discharged from a plurality of bores into at least two discharge holes, wherein a frequency of the pulsation pressure is increased in proportion to the number of the discharge holes, but the strength of the pulsation pressure is decreased in inverse proportion to the number of discharge holes. Therefore, the driving noise of the compressor that is formed in proportion to the strength of the pulsation pressure is considerably decreased.

Abstract: A swash plate type compressor comprises a cylinder block; a rotation shaft rotatably held in the cylinder block; a swash plate swingably connected to the rotation shaft to rotate therewith; a plurality of piston bores circumferentially arranged about the rotation shaft; a plurality of pistons operatively received in the piston bores respectively, each piston having a holding portion that slidably holds a peripheral portion of the swash plate, so that when the rotation shaft is rotated about its axis, the swash plate pulls and pushes the pistons thereby to reciprocate the same; a valve plate connected to a rear end of the cylinder block, the valve plate having a group of inlet openings connected to the piston bores respectively and another group of outlet openings connected to the piston bores respectively; a rear head connected to the valve plate, the rear head having an intake chamber exposed to the inlet openings and a discharge chamber exposed to the outlet openings, the intake chamber surrounding the disc

Abstract: It is an object of the invention to, even in the case where liquid containing a sedimenting material such as slurry is used, prevent sedimenting and aggregation from occurring in a pump. As means for attaining the object, a bellows 7 that is extendingly and contractingly deformable in the axial direction is placed in a pump body 1 with setting the axis B of the bellows vertical so as to be driven to perform extending and contracting deformation, and form a liquid chamber 9 inside the bellows 7. A suction port 18 and a discharge port 19 are formed in an inner bottom face 4a of the pump body 1 facing the liquid chamber 9. Liquid is sucked from the suction port 18 into the liquid chamber 9 by extension of the bellows 7, and the liquid in the liquid chamber 9 is discharged from the discharge port 19 by contraction of the bellows 7. The inner bottom face 4a is formed into a conical shape in which the face is downward inclined as moving toward the discharge port 19.

Abstract: The invention relates to a piston pump for a vehicle brake system, in particular a slip-controlled hydraulic vehicle brake system. For damping pressure pulsations, the invention proposes proving a throttle, as a place of narrowed cross section, in an outlet conduit of the piston pump.

Abstract: A reciprocating compressor is provided with a plurality of gas compression means having a cylinder and a piston, the piston of each gas compression means is cooperated with the compressor by converting a rotating motion of a crankshaft provided on an electric drive source to a reciprocating motion by a scotch yoke mechanism, wherein an increase of the volume of discharged gas can be achieved without designing a gas compression means to be wide or without increasing the number thereof, a pulsation of discharged gas can be decreased by an attachment of an expansion muffler on the cylinder head so as to decrease a vibration and noise of the compressor, an attachment of the fly wheel to the crankshaft and an adjustment of the shaft with the crankshaft can be improved easily, further compressed gas flows are joined and discharged in concentration, thereby the pulsation of discharged gas can be restrained.

Abstract: Disclosed herein is a swash plate type compressor used for the air conditioner of an automobile, and more particularly, a compressor having a structure where pulsation pressure caused during refrigerants are compressed and discharged is reduced, thereby permitting the noise at the time of driving to be substantially reduced. The compressor according to the present invention can embody the structure by distributing and discharging refrigerant that has been compressed by a plurality of pistons and discharged from a plurality of bores into at least two discharge holes, wherein a frequency of the pulsation pressure is increased in proportion to the number of the discharge holes but a strength of the pulsation pressure is decreased in inverse proportion to the number of the discharge holes. Therefore, the driving noise of the compressor that is formed in proportion to the strength of the pulsation pressure is considerably decreased.

Abstract: The invention provides a pulsation damping device in which an offset load on a pulsation suppression diaphragm is eliminated while an air supply valve and an air discharge valve are separately and independently juxtaposed, and an extendable and contractible portion of the pulsation suppression diaphragm is always caused to be straightly extendingly and contractingly deformed in the axial direction of a device body casing, whereby the response property of the opening and closing operations of the air supply and discharge valves can be improved and the pulsation suppressing performance can be ensured.

Abstract: A compressor has a suction muffler structure capable of reducing vibration and noise accompanying liquid compression. The suction muffler structure involves a muffler chamber defined between a suction chamber of the compressor and an external coolant circuit. A suction passage connects the muffler chamber to the suction chamber. A liquid-storage space is formed in the region of the muffler chamber lower than the inlet of the suction passage to the muffler chamber.

Abstract: A compressor includes a cylinder block having a refrigerant discharge chamber installed at a cylinder head, a first discharge muffler installed at a lower part of the cylinder block, a second discharge muffler connected to a refrigerant discharge pipe and installed at a lower part of the cylinder block, a refrigerant passage connecting the refrigerant discharge chamber and the first discharge muffler, and the refrigerant passage has a greater cross-sectional area of a refrigerant suction part than the cross-sectional area of a refrigerant discharge part, and a connection pipe connecting the first discharge muffler and the second discharge muffler, the refrigerant suction part of the refrigerant passage and an inner diameter of the connection pipe have different values with predetermined proportion.

Abstract: A reciprocating compressor has a pair of discharge mufflers disposed on a lower portion of a cylinder block, a first and a second refrigerant channels for intercommunicating the pair of discharge mufflers with a refrigerant discharge chamber of a cylinder head, a pair of muffler covers for sealing the pair of discharge mufflers, respectively, a connecting pipe for connecting the pair of muffler covers with each other, and a refrigerant discharge pipe connected to either one of the pair of muffler covers that is intercommunicated with the second refrigerant channel. The first and the second refrigerant channels have refrigerant inflow sides connected to the refrigerant discharge chamber, and refrigerant outflow sides having a cross-sectional area smaller than the cross-sectional area of the refrigerant inflow sides.

Abstract: Since many valves are used, pressure loss is large, resulting in low reliability of a pump. Even when the period of increasing and decreasing the volume of a pump chamber is long, and a piezoelectric element is used as an actuator that drives a diaphragm, a driving operation cannot be performed at a high frequency, or a proper flow rate cannot be realized under a high load pressure. In accordance with the invention, the combined inertance value of an entrance passage used to make working fluid flow into a pump chamber is smaller than the combined inertance value of an exit passage used to make the working fluid flow out from the pump chamber. A fluid resistance member is provided at the entrance passage in which fluid resistance when the working fluid flows into the pump chamber is smaller than fluid resistance when the working fluid flows out of the pump chamber.

Abstract: A double-headed piston compressor includes a pair of opposite discharge chambers. Each discharge chamber is defined by a large annular wall and a small annular wall. The annular walls are located about the axis of the drive shaft. A limit wall is formed in each housing and is located in each discharge chamber. Each limit wall extends substantially radially to connect the annular walls near the outlet of the discharge chamber. Therefore, each discharge chamber forms a gas passage, which extends circularly about the axis of the drive shaft from the limit wall to the outlet. Compressed gas discharged from the cylinder bores to each discharge chamber through the discharge ports flows in one direction toward the outlet. As a result, pulsation of compressed gas is attenuated.

Abstract: According to the structure for damping the pulsations of discharge pressure of a compressor of the present invention, in the annular discharge chamber 28 divided on the outer circumferential side in the rear housing 5, two bulkhead sections 35 are extended from positions on both sides of the outlet 23 in the circumferential direction in such a manner that they are separate from each other. The end portion of each bulkhead section 35 is extended to halfway between the first discharge port section 20 and the second discharge port section 21. The flow path from the first discharge port section 20 to the outlet 23 is directed to the opposite side to the outlet 23 and then turned back to the outlet 23. Therefore, the length of the flow path from the first discharge port section 20 to the outlet 23 becomes relatively long.

Abstract: A damping device is arranged in a gas passage in a compressor for damping compression waves transmitted from suction valves. The damping device includes a damper arranged in a damper hole provided in a pipe fitting of the compressor housing. The damper has concentric inner and outer cylindrical walls, and end wall closing ends of the inner and outer cylindrical walls, and radial holes at the end of the inner cylindrical wall. The outer cylindrical wall is arranged in the damper hole and the inner cylindrical wall is fitted in the fitting hole leading to the suction chamber. A gas passage is formed by an inner passage portion, radial holes, an inter-wall passage portion, a radial passage portion at the end opposite to radial holes, and an outer passage portion between the outer cylindrical wall and the side cylindrical wall of the damper hole.

Abstract: A compressor that reduces pressure pulsation includes a mounting member for attaching the compressor to a vehicle support. The mounting member is integrally formed with an end wall of a rear housing member. A suction chamber and a discharge chamber are defined in the rear housing member. The discharge chamber is located outside the suction chamber and surrounds the suction chamber. An auxiliary chamber is formed in the mounting member. The auxiliary chamber is centrally located. The auxiliary chamber increases the volume of the suction chamber, which reduces pulsation. Since the auxiliary chamber is formed in the mounting member, neither the weight or the volume of parts that might interfere with other devices is increased.

Abstract: The invention provides a pump with a pulsation suppression device which can further enhance the effect of suppressing pulsation. According to the invention, in one side portion of a pump head wall 1 having inflow and outflow passages 2 and 3, a first bellows 7 which is driven so as to extend and contract by an air cylinder portion 14, and check valves 16a and 16b which alternately open and close a pump working chamber 9a formed in the first bellows 7 are disposed to constitute a reciprocal pump portion 4. In the other side portion of the pump head wall 1, a pulsation suppressing portion 5 is configured so as to have a second bellows 18 that is extendable and contractible, and that forms: a liquid chamber 20a which can temporarily store liquid that is to be discharged from the pump portion 4; and an air chamber 20b which is isolated from the liquid chamber 20a.

Abstract: An axial piston pump of the swash-plate variety having a rotating cylinder block and pistons movable in a longitudinal direction within bores formed in the block, and having a reversing capacitance for reducing pressure pulsations. For the further reduction of such pulsations, one or more channels, each having an associated discharge opening, are formed into a web of the valve plate of the pump to sequentially couple the reversing capacitance into fluid communication with the cylinder bores passing across the web.

Abstract: According to the present invention, a device body casing 17 has a liquid chamber 20a for temporarily storing a liquid to be transported by a pump, a gas chamber 20b, and an extendably and contractibly deformable pulsation suppression diaphragm 18, which separate them. The device body casing 17 having an aperture 27 so as to communicate with gas chamber 20b, is detachably engaged with a valve case 23. The valve case 23 is provided with an automatic gas supply valve mechanism 33 and an automatic gas exhaust valve mechanism 34, which restrict the amount of the extendable and contractible deformation of the pulsation suppression diaphragm 18 within the predetermined range, so that a liquid pressure inside the liquid chamber 20a and an atmospheric pressure inside the gas chamber 20b may balance each other when the discharge pressure of the pump is fluctuated. The automatic gas exhaust valve mechanism 34 is provided with a gas exhaust port 32, a gas exhaust valve element 43, and a slider 48.

Abstract: The invention provides a pulsation damping device in which an offset load on a pulsation suppression diaphragm is eliminated while an air supply valve and an air discharge valve are separately and independently juxtaposed, and an extendable and contractible portion of the pulsation suppression diaphragm is always caused to be straightly extendingly and contractingly deformed in the axial direction of a device body casing, whereby the response property of the opening and closing operations of the air supply and discharge valves can be improved and the pulsation suppressing performance can be ensured. In the pulsation damping device, a valve casing 23 in which an air supply valve 36 and an air discharge valve 43 are disposed in parallel is attached into an air chamber 20b of a device body casing 17. An air supply/discharge valve control plate 28 is placed so as to abut against a center portion of a closed end face 18b of a pulsation suppression diaphragm 18.

Abstract: The invention provides an exemplary pulsation dampener which comprises a vessel which defines an interior for receiving a fluid. At least two resilient cartridges are disposed within the interior of the vessel. The cartridges are pressurized to different pressures so that they will dampen pressure pulses within the fluid which have different pressure peaks.

Abstract: A hydraulic pump [10] for use in a power steering system includes a power steering fluid chamber [24] for receiving power steering fluid from a fluid source. The power steering fluid chamber [24] is in fluid communication with a fluid passageway [26] which transfers fluid to a pressure wave attenuator [46] for receiving power steering fluid from the power steering fluid chamber [24] such that fluid borne noise in the power steering system is minimized.

Abstract: A fuel supply aggregate has a fuel pump formed as a rotary pump and having at least one impeller with a plurality of vanes for supplying fuel from a tank, the fuel pump having an inlet connection, and a fuel throughflow noise damper located upstream of the fuel inlet connection of the fuel pump.

Abstract: A hydraulic pump [14] for an electro-hydraulic power steering system is positioned in a fluid reservoir [16] in a pump housing [12]. The pump [14] has an upstream end [40] that receives fluid from a fluid source and a downstream end [42] that is in communication with fluid expelled from the pump [14]. The pump housing [12] has an integral dampening chamber [36] formed therein adjacent the downstream portion [42] of the pump [14]. The dampening chamber [36] helps minimize pressure pulsations before the fluid is passed through an outlet opening [18] in the housing [12] to a steering gear.

Abstract: A hydraulic pump [14] for an electro-hydraulic power steering system is positioned in a fluid reservoir [16] in a pump housing [12]. The pump [14] has an upstream end [40] that receives fluid from a fluid source and a downstream end [42] that is in communication with fluid expelled from the pump [14]. The pump housing [12] has an integral dampening chamber [36] formed therein adjacent the downstream portion [42] of the pump [14]. The dampening chamber [36] helps minimize pressure pulsations before the fluid is passed through an outlet opening [18] in the housing [12] to a steering gear.

Abstract: Disclosed is an air-tight type reciprocating compressor which can decrease discharge pulsation to reduce the vibration of a discharge line as well as to reduce an overall value in a high-frequency band as a problem frequency. The compressor, which has case members, each of which being coupled on the lower parts of a block, for receiving discharge refrigerant flowing through at least two discharge holes on the block, a connecting pipe which is adapted to communicate with the case members, and a discharge pipe which is connected to one of the case members, includes one of the at least two discharge holes having the larger diameter by at least 50-70% than that of the other which is installed on the case member to which the discharge pipe is connected.

Abstract: A high-pressure fuel supply assembly includes a first member composed stainless steel and a second member composed of plated low-carbon steel in at least one weld portion among a low-pressure damper weld portion, a high-pressure fuel pump weld portion, and a high-pressure regulator weld portion.

Abstract: A fluid pump has a pump body and a displacer which is adapted to be positioned at a first and at a second end position by means of a drive, the displacer and the pump body being implemented such that a pump chamber is defined therebetween, and the pump chamber being adapted to be fluid-connected to an inlet and to an outlet via a first opening and a second opening which are not provided with check valves. An elastic buffer bordering on the pump chamber is provided. The displacer is implemented in the form of a plate which is secured to the pump body, and the pump body is provided with a recess defining the pump chamber. The drive acts on the displacer substantially in the area of the first opening. The displacer closes the first opening when it occupies its first end position and leaves the first opening free when it occupies its second end position.

Abstract: A high-pressure fuel supply assembly includes a high-pressure fuel pump for pressurizing fuel from a low-pressure fuel intake passage and discharging high-pressure fuel into a high-pressure fuel discharge passage, a high-pressure damper disposed in the high-pressure fuel discharge passage for absorbing surges in the high-pressure fuel, a high-pressure regulator disposed in a branch passage branching from a branch portion of the high-pressure fuel discharge passage for adjusting the high-pressure fuel from the high-pressure damper to a predetermined pressure, and an orifice disposed in the high-pressure fuel discharge passage downstream from the branch portion for absorbing surges in the high-pressure fuel.

Abstract: A first fuel inlet, a second fuel inlet, a first fuel outlet, and a second fuel outlet of a valve assembly of a high-pressure fuel pump are formed radially outside an aperture portion of a fuel pressurization chamber.

Abstract: A hydraulic pump [10] for use in a power steering system includes a power steering fluid chamber [26] for receiving power steering fluid from a fluid source. The power steering fluid chamber [26] is in fluid communication with a first fluid conduit [40] and a second fluid conduit [46] each of which has different lengths. A pressure valve attenuator [52] has two ports, one in communication with the first fluid conduit [40] and one in communication with the second fluid conduit [46] for receiving power steering fluid from the power steering fluid chamber [28] such that fluid borne noise in the power steering system is minimized.

Abstract: A hydraulic unit for a vehicle brake system that enables limiting wheel brake slip is known. To that end, the hydraulic unit has at least one piston pump, which is drivable by an electric motor and empties a reservoir that is filled on the occasion of the limitation of wheel brake slip. This reservoir comprises a cylinder, embodied in the manner of a blind bore, as well as a piston that divides a storage chamber from a spring chamber in the cylinder, a spring, and a closure element that prevents water from entering the cylinder if the hydraulic unit should become immersed in water. A pressure equalization conduit begins at the spring chamber and leads into the interior of the motor, so that a displacement of the piston for taking up pressure fluid in the storage chamber is effected essentially only by friction of the piston and forces of the spring. A conduit is also provided, by means of which pressure fluid that emerges from the piston pump at the eccentric can be carried away.

Abstract: The invention provides an exemplary pulsation dampener which comprises a vessel which defines an interior for receiving a fluid. At least two resilient cartridges are disposed within the interior of the vessel. The cartridges are pressurized to different pressures so that they will dampen pressure pulses within the fluid which have different pressure peaks.

Abstract: This invention relates to a device to reduce pulsations on a hydrostatic positive displacement unit, such as an axial piston machine or a radial piston machine which can be used both as a pump and as a motor. The direction of rotation of the positive displacement unit is reversible and at least one piston is mounted so that it can move longitudinally in a cylinder bore forming a cylinder chamber. The device has a buffer element which can be brought into communication with the cylinder chamber by a connecting channel.

Abstract: The present invention relates to a high-pressure fuel pump assembly 200, which supplies high-pressure fuel from a fuel supply port 9 to a delivery pipe 1a, wherein the high-pressure fuel pump assembly 200 comprises: a high-pressure pump 20 having an intake valve 22 and a discharge valve 21; a fuel discharge passage 4 connecting the discharge valve 21 to the fuel supply port 9; and a high-pressure damper 60 disposed in the fuel discharge passage 4; and a first check valve 210, which opens when the pressure on the voluminous chamber side is a fixed value lower than the pressure on the discharge valve side, is provided within the fuel discharge passage 4 between the high-pressure damper 60 and the discharge valve 21. The first check valve may be a ball valve or a reed valve, and a second check valve may be provided between the fuel supply port 9 and the high-pressure damper 60.