Abstract: A drilling fluid pumping system including a pump apparatus with a pumping chamber having an inlet valve and an outlet valve and a dampener system in fluid communication with the pumping chamber for damping the flow of fluid, e.g. drilling fluid, This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b).

Abstract: A mechanism for reducing pressure pulsation includes a pair of metal dampers formed by joining two disk-shaped metal diaphragms over an entire circumference and forming a hermetically sealed space inside a joined portion, with gas being sealed in the aforementioned hermetically sealed space of the damper, has a pair of pressing members which give pressing forces to both outer surfaces of the aforementioned metal dampers at a position at an inner diameter side from the joined portion, and is unitized with the pair of pressing members being connected in a state in which they sandwich the metal damper.

Abstract: A device includes: actual-intake-pipe-pressure detection unit (11); estimated-intake-pipe-pressure detection unit (12) for calculating an estimated intake pipe pressure based on a rotation speed of the engine and an opening degree of a throttle valve; pressure difference calculation unit (13) for calculating a pressure difference between the actual and estimated intake pipe pressures; pressure difference integration unit (14) for integrating the pressure difference with respect to time; pumping brake detection unit (15) for determining that a pumping brake operation is performed when a integral value is equal to or more than a first determination value; and throttle valve control unit (16) for carrying out control for the pumping brake during the pumping brake operation based on a result of the determination by the pumping brake detection unit (15), and carrying out ordinary control otherwise.

Abstract: A fuel gallery has an inlet opening through which a fuel is introduced therein and a suction opening through which the fuel flows between the fuel gallery and a compression chamber. A pulsation damper is supported in the fuel gallery by a first and a second supporting member. The second supporting member defines an inner fuel chamber and outer fuel chamber which communicates with each other through apertures. The suction opening is located at a side wall of the fuel gallery and the inlet opening is located at a bottom wall of the inner fuel chamber which is defined radially inside of the second supporting member. The fuel discharged into the outer fuel chamber through the suction opening is introduced into the inner fuel chamber through the apertures. A flow velocity of the fuel is decreased and a pressure pulsation reduction effect of the pulsation damper is surely achieved.

Abstract: A fuel gallery has a first opening port communicated to a variable volume chamber formed at a lower side of a plunger and a second opening port communicated to a fuel pressurizing chamber formed at an upper side of the plunger. A connecting tube member is provided in the fuel gallery for communicating the first and second opening ports with each other. During a fuel amount adjusting stroke, for example, in which the plunger is moved in an upward direction, a part of excessive fuel from the fuel pressurizing chamber is supplied to the variable volume chamber through the connecting tube member and the remaining part of the excessive fuel is discharged from the connecting tube member into the fuel gallery through a communication through-hole formed in the connecting tube member.

Abstract: A method of producing a diaphragm damper 1 having a high pressure chamber 3 comprised of two diaphragms 2 with flanges 6 welded together and charged inside with a high pressure gas. The diaphragms 2 are made of magnetically attractable thin metal sheets. A pair of jigs 30, 40 provided to face each other inside the pressure vessel 20 hold the diaphragms 2 by magnetic force. The pressure vessel 20 is sealed and evacuated, then the pressure vessel 20 is charged and pressurized by a mixed gas including helium. After this, the pair of jigs 30, 40 are made to approach each other to make the flanges 6 of the pair of diaphragms 2 come into close contact. Inside the pressure vessel 20, the jigs 30, 40 are simultaneously rotated to rotate the pair of diaphragms 2 and a laser beam is fired at the flanges 6 of the diaphragms 2 to weld the flanges 6 over their entire circumferences.

Abstract: A fluid feed pump is configured, such that a fluid is fed from an outlet channel of the fluid feed pump through an outlet buffer chamber to a fluid channel. The outlet buffer chamber is designed to have a higher compliance than a compliance of a pump chamber. The driving period of the fluid feed pump is set to a shorter period than a time constant defined by the compliance of the pump chamber and a flow resistance between an inlet of the outlet channel and an outlet of the fluid channel. This enables the fluid to be fed with high efficiency by taking advantage of the pressure oscillation occurring between the pump chamber and the outlet buffer chamber.

Abstract: A mechanism for reducing pressure pulsation includes a pair of metal dampers formed by joining two disk-shaped metal diaphragms over an entire circumference and forming a hermetically sealed space inside a joined portion, with gas being sealed in the aforementioned hermetically sealed space of the damper, has a pair of pressing members which give pressing forces to both outer surfaces of the aforementioned metal dampers at a position at an inner diameter side from the joined portion, and is unitized with the pair of pressing members being connected in a state in which they sandwich the metal damper.

Abstract: A high-pressure pump has: a plunger; a pump body; a cover member for covering the pump body and forming a fuel chamber; a pulsation damper body constructed of upper and lower diaphragms with their peripheral edge portions joined and for reducing pressure pulsation in the chamber, the upper and lower diaphragms trapping gas having a given pressure between them; an upper support member having an upper ring-shaped part and an upper support body, the upper ring-shaped part being joined to the peripheral edge portion of the upper diaphragm, the upper support body extending from the upper ring-shaped part and abutting on the cover member; and a lower support member having a lower ring-shaped part and a lower support body, the lower ring-shaped part being joined to the peripheral edge portion of the lower diaphragm, the lower support body extending from the lower ring-shaped part and abutting on the pump body.

Abstract: A fluid pressure pulsation damper mechanism includes: a metal damper having two metal diaphragms joined together with a hermetic seal for forming a sealed spacing filled with a gas between the two metal diaphragms, an edge part overlapping along outer peripheries thereof, a main body having a damper housing in which the metal damper is accommodated, and a cover attached to the main body to cover the damper housing and isolate the damper housing from outside air.

Abstract: A rotary pressure production turbine for pressurizing a hydraulic fluid is disclosed comprising a plurality of piston assemblies. Each piston assembly comprises a hollow needle piston shaft having through which hydraulic fluid is moved from a low pressure volume to a high pressure volume as the piston shaft moves in a first direction. A rotary actuator actuates each piston shaft. From the high pressure volume, hydraulic fluid is moved to a common high pressure header and delivered to an aspirated accumulator where the fluid can be stored and subsequently utilized. In some embodiments, the fluid is utilized to operate an electric generator for use in a hybrid-electric vehicle. In some embodiments, the rotary actuator is driven by an internal combustion engine, while in others the rotary actuator is driven by a vehicle drive train in a regenerative braking application.

Abstract: A blower assembly including a motor (4), an impeller (6) and a volute (8) that is configured such that an inlet chamber (112) of the volute and an outlet chamber (114) of the volute are divided from one another by an airtight membrane (128a-b) and the membrane is configured to allow the transmission of pressure waves between the inlet and outlet chambers.

Abstract: A device for reducing hydraulic-fluid oscillation in a hydraulic system, in particular in a hydraulic system of an aircraft, wherein the hydraulic system comprises a pump that is driven by a drive, which pump conveys a fluid to a hydraulic line by pressure pulsation. The device comprises an actuator, arranged in the hydraulic line for generating pressure pulsation that compensates for the pressure pulsation of the pump.

Abstract: An exemplary pump includes a pump housing defining a pump cavity, a movable pumping member situated in the pump cavity, and at least one pressure-absorbing member located inside the pump housing. The housing also has an inlet and an outlet, and includes at least one interior non-wearing location that contacts liquid in the pump housing when the pump housing is primed with the liquid. The movable pumping member, when driven to move, urges flow of the liquid from the inlet through the pump cavity to the outlet. The at least one pressure-absorbing member is located inside the pump housing at the non-wearing location and contacts the liquid. The pressure-absorbing member has a compliant property to exhibit a volumetric compression when subjected to a pressure increase in the liquid contacting the pressure-absorbing member, the volumetric compression being sufficient to alleviate at least a portion of the pressure increase.

Abstract: A refrigerant compressor that includes a compressor housing enclosing an outlet chamber and an outlet passage leading from the outlet chamber to an external high pressure connection, such that the pulsations in it are damped as much as possible. The refrigerant compressor includes a pulsation damping element inserted into the outlet passage of the compressor housing following the outlet chamber. The pulsation damping element has an inlet baffle which faces the outlet chamber and extends over a cross section of the outlet passage and, located opposite to the inlet baffle is an outlet baffle which extends over the cross section of the outlet passage. At least one reflection chamber is provided between the inlet baffle and the outlet baffle. The inlet baffle and the outlet baffle each have at least one passage which faces a reflection surface on the respectively other baffle.

Abstract: Gas of a predetermined pressure, which is equal to or higher than the atmospheric pressure, is filled in a damper chamber of a damper member that includes first and second-side diaphragms. A first-side limiting portion of a first-side cover member and a second-side limiting portion of a second-side cover member are engageable with a first-side concave portion of the first-side diaphragm and a second-side concave portion of the second-side diaphragm, respectively, to limit bulging of the damper member when a pressure of a fluid chamber is equal to or less than the predetermined pressure.

Abstract: A piston pump as a return pump of a slip-controlled, hydraulic vehicle braking system is disclosed. There is a mushroom-shaped shut-off body as a spring-loaded outlet valve, the shaft thereof extending through a center hole of a tubular damper piston. The shut-off body is movable transversely to the opening and closing direction thereof, so that said shut-off body aligns with a valve seat upon closing. Upon opening, the damper piston forces brake fluid out of a damping chamber in which it is housed so that an opening movement of the outlet valve is dampened.

Abstract: A pump includes a pump casing defining a first chamber and a second chamber, and fluid moves from the first chamber to the second chamber during a stroke. The pump also includes a needle that is movably disposed in the first chamber and a valve carriage that is movably disposed in the second chamber. The valve carriage includes an internal stop, and the valve carriage also includes a cavity therein that is partially defined by the internal stop. The pump further includes a valve that is movably disposed within the cavity of the valve carriage, and the valve is operable to be impacted by the needle during the stroke. Also, the needle is operable to impact the valve carriage during the stroke. Moreover, the valve is operable to impact the internal stop during the stroke at a time different from the needle impacting the valve carriage.

Abstract: The present invention provides an active, electrically powered hydraulic fluid accumulator. The accumulator includes an electric motor having its output coupled to a mechanical rotation to linear translation transducer such as a lead screw, ball spline or similar device. The output of the mechanical transducer is coupled to a piston disposed within an accumulator cylinder. The accumulator cylinder preferably communicates with a pair of inlet and outlet check valves disposed in hydraulic supply and feed lines from the system pump or sump and to the system, respectively.

Abstract: A shunt pulsation trap for a cyclic positive displacement (PD) compressor reduces gas pulsation, NVH and improves off-design efficiency without using a traditional serial pulsation dampener and a variable geometry. Generally, a shunt pulsation trap for a cyclic PD compressor is configured to trap and attenuate gas pulsations before discharge and comprises a housing structure having a flow suction port, a flow discharge port, a compressor cavity and a pulsation trap chamber adjacent to the PD compressor cavity, therein housed various pulsation dampening means or pulsation energy recovery means or pulsation containment means, at least one injection port (trap inlet) branching off from the PD compressor cavity into the pulsation trap chamber and a feedback region (trap outlet) communicating with the PD compressor outlet. The associated principles, methods and embodiments are disclosed.

Abstract: An extended passage of a press-side passage is supposed in a fuel gallery. This supposed extended passage of the press-side passage extends toward a lid member. The press-side passage is opened at the side wall of the fuel gallery. A center axis of the press-side passage is inclined in such a manner that a fuel returning from the press-side passage to the fuel gallery flows toward the lid member. A bottom-side fringe of a damper unit does not exist in the supposed extended passage.

Abstract: A muffler for a compressor has a chamber between an inlet and an outlet and a communicating pipe for indirectly connecting the inlet to the outlet, whereby a suction loss of a refrigerant sucked into the muffler for the compressor can be reduced and also pressure pulsation can be reduced so as to enhance a cooling capability of the compressor and achieve a noise reduction effect. Also, an assembling structure of the muffler can be simplified, resulting in reduction of fabricating cost and improvement of productivity.

Abstract: A gas chamber is placed adjacent to a variable volume chamber of a high pressure pump. The gas chamber includes an inner blocking wall, which borders on the variable volume chamber and contacts fuel in the variable volume chamber, an outer blocking wall, which is opposed to the inner blocking wall, and gas, which fills a space that is defined between the inner blocking wall and the outer blocking wall.

Abstract: Different inner diameter internal or external pressure drop tubes or orifice plate openings producing different discharge pressure pulse amplitudes are employed in a pump pulsation control reactive discharge dampener. Either both pressure drop tubes/orifice plates may be mounted concurrently on or in the dampener, connected to different discharge pipes used selectively by the operator depending upon the piston or plunger size being employed, or the pressure drop tubes/orifice plates may be interchangeable.

Abstract: The present invention provides a fluid system (99) comprising a source of hydraulic fluid under pressure supplying a hydraulic fluid consumer (103) together with a valve passing fluid between said source and said fluid consumer (102). A first fluid compliance (105) is situated between said source (100) and said valve (102) and a variable restrictor (110) is provided for varying the cross sectional area available for flow of fluid through said valve (102) and is movable between a first position (A) with a larger said area and a second position (B) with a smaller said area. A bias means (117) biases said restrictor (110) towards said second position whilst an opening means (Fa) urges said restrictor (110) against said bias (117) when fluid flows through said valve (102) and a damping means (126) damps movement of said restrictor between said first and second positions and provides a resistance which increases with the velocity of displacement of said restrictor (110).

Abstract: A hydraulic fluid supply system includes an active pressure regulator or feed limit valve with a flow cut-off which may be used with dual clutch transmission hydraulic control systems. The supply system includes a pump, a filter, pressure relief and filter bypass valves, an accumulator, a system pressure sensor and the active feed limit valve. The active feed limit and flow cut-off valve includes an on-off solenoid valve and a spool or logic valve having an inlet port, an outlet port, a control port, a feedback port and an exhaust port. The inlet port is supplied with pressurized hydraulic fluid and the control port is supplied with hydraulic fluid from the solenoid control valve when it is energized. A valve spool having a pair of spaced-apart lands is biased toward the control port. One side of a check valve is in fluid communication with the feedback port.

Abstract: A liquid pump is provided in which pulsations can be properly absorbed even if the pump is driven at a high frequency. A pulsation absorbing unit for absorbing pulsation includes a pulsation absorbing housing disposed on a pump housing member, a second diaphragm attached to the pulsation absorbing housing member and defining a pulsation absorbing chamber communicating with a liquid outlet passage of a liquid pump unit, and a disc spring for biasing the second diaphragm toward the pulsation absorbing chamber.

Abstract: A damper assembly for a fuel pump includes at least one diaphragm assembly formed by joining two metal diaphragms to respective two sides of an imperforate central plate, thereby creating a pair of closely spaced diaphragms, each acting upon its own gas volume. Preferably, the diaphragm assembly has (a) a rigid, relatively thick circular or polygonal central plate, (b) a first circular diaphragm having a rim portion sealingly secured as by welding to the plate and a relatively thin, flexible, convex portion projecting from one side of the plate and defining a first pressurized gas volume, and (c) a second circular diaphragm having a rim portion sealingly secured as by welding to the plate and a relatively thin, flexible, convex portion projecting from the other side of the plate and defining an independent second pressurized gas volume.

Abstract: A piston pump having a piston longitudinally movable in a housing. A first pressure chamber is delimited by the piston element and a component affixed to the housing. The first pressure chamber is connected to a suction region via an inlet valve and is operationally connected to a delivery side via an outlet valve. A compensation piston unit has a working piston chamber connected to the delivery side. A stroke volume of the first pressure chamber is twice the size of a stroke volume of the working piston chamber. The piston element and a component affixed to the housing delimit a second pressure chamber connected to the suction region which is operationally connected to the first pressure chamber during a suction stroke of the piston element whose volume varies by half the stroke volume of the first pressure chamber and expands with a delivery stroke of the piston element.

Abstract: A system for generating variable frequency tube waves includes a high pressure multiplex pump having a number of plungers, with each plunger operatively coupled to a suction valve on a suction side and a discharge valve on a discharge side. The suction valve or the discharge valve of a first one of the plungers includes an opening, such that the modified plunger on a discharge stroke pushes fluid through the opening in the suction or discharge valve. The system includes a tubular fluidly coupling the high pressure multiplex pump to a wellbore, and a pressure sensor that receives tube waves generated by the high pressure multiplex pump and reflected from the wellbore.

Abstract: The invention provides an oil pump resonator in which various vibrations caused by pulsations that change in response to changes in oil pressure on a discharge port side can be attenuated by a resonator that comprises only one chamber, whereby the volume occupied by the resonator can be minimized. An oil pump in an engine, for feeding oil from a suction port to a discharge port through rotation of a rotor fitted in a pump housing, includes: a discharge flow channel communicating with the discharge port; a resonator comprising an introduction channel formed in the discharge flow channel and a chamber communicating with the introduction channel; and a piston having a leading end face section that makes up an inner wall face of the chamber, and reciprocating in response to pulsation changes. The piston slides so as to reduce the volume of the chamber as the frequency distribution of the pulsations becomes higher.

Abstract: A hydraulic pump has a rotor and a hollow housing with a main interior chamber. The rotor is rotatably mounted in the main interior chamber. A smaller interior chamber is separated from the main interior chamber such that the smaller interior chamber retains gas therein when the main interior chamber is filled with a liquid. There is also a method for accommodating changes in volume of hydraulic fluid within the main chamber of the hydraulic pump housing. The method comprises providing the smaller interior chamber separated from the main chamber and retaining gas within the smaller chamber when the main interior chamber is filled with liquid, whereby expansion or contraction of the gas accommodates changes of volume of the liquid within the housing.

Abstract: A supercharger has an inner wall defining an inner cavity for receiving lobed rotors for rotation therein, a low-pressure inlet and a high-pressure outlet. A sound attenuator is associated with the housing and located adjacent to the high-pressure outlet. The sound attenuator has a tuner chamber and circumferentially spaced tuner ports fluidly connecting the tuner chamber with the internal cavity of the housing to define a Helmholtz resonator. A land is defined between the circumferentially spaced tuner ports such that the high-pressure outlet and low-pressure inner chambers defined between the rotor lobes and the inner wall are fluidly connected when the rotor lobes are in alignment with the land to reduce the pressure differential between the high-pressure outlet and the low-pressure inner chambers.

Abstract: The present invention discloses a linear compressor in which a piston is linearly reciprocated inside a cylinder, for sicking a refrigerant into a compression space between the piston and the cylinder, and compressing and discharging the refrigerant, and especially, a structure of discharging the refrigerant for the linear compressor which can reduce a pulsation of a high pressure discharged refrigerant, by making the refrigerant compressed in the compression space flow from a sub-discharge space with a relatively small volume to a sub-discharge space with a relatively large volume in a discharge chamber. As a result, the structure of discharging the refrigerant for the linear compressor can efficiently reduce noise and vibration.

Abstract: In a hydraulic piston pump, a cylinder port can communicate with a discharge port after a system pressure and a chamber pressure in a cylinder bore becomes in an equilibrium condition. A through hole opening to a surface on which a cylinder block slides in a valve plate is allowed to communicate with a side of one end surface of a balance valve, and the system pressure of a discharge port side is supplied to the other end surface of the balance valve. In the balance valve, a balance piston which slides by a pressure difference between the chamber pressure of the cylinder bore and the system pressure is accommodated. Before the cylinder port communicates with an oil guiding groove, the chamber pressure can be equilibrated to the system pressure by an activation of the balance piston.

Abstract: A drilling fluid pumping system including a pump apparatus with a pumping chamber having an inlet valve and an outlet valve and a dampener system in fluid communication with the pumping chamber for damping the flow of fluid, e.g. drilling fluid, This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C. F. R. 1.72(b).

Abstract: A high-pressure fuel supply pump mounted with a discharge valve that can reduce an influence of noise caused by a valve body-circumferential flow and a discharge valve unit used therein. The high-pressure fuel supply pump includes a discharge valve (8) which is a non-return valve between a pressurizing chamber (11) and a discharge port (13). The discharge valve (8) includes a valve body housing (8d), a discharge valve spring (8c), a valve body (8b) and a seat member (8a). The discharge valve (8) is a flat valve. When the valve is opened, a flow of fuel moving from the pressurizing chamber and axially colliding with the valve body is radially distributed in the radial direction of the valve body to become a flow directly moving the discharge ports and a flow colliding with an inner wall of the valve body housing before moving toward the discharge ports and then in a circumferential direction of the valve body.

Abstract: A system, in certain embodiments, includes a pulsation dampener for minimizing the adverse effects of pulsation waves in a process fluid generated by a reciprocating compressor. The pulsation dampener may be installed proximate to the source of the pulsation waves and external to a main flow path of the process fluid being compressed within the reciprocating compressor. More specifically, in certain embodiments, the pulsation dampener may be a pulsation dampening valve enclosure configured to at least partially encase a valve assembly of the reciprocating compressor. The pulsation dampening valve enclosure may be filled with a pulsation dampening material, such as a wire mesh material, a viscoelastic material, an elastomeric material, or a combination thereof.

Abstract: In a liquid discharge control apparatus which uses a piezoelectric type diaphragm pump, an accumulator having a liquid accumulation cavity and a movable member is communicated to an outlet of the diaphragm pump. In discharge operation of the diaphragm pump, a quantity of the liquid in the liquid accumulation cavity is rapidly increased, and the movable member is elastically deformed so as to increase of the volume of the liquid accumulation cavity. Alternatively, in suction operation, when a back stream of the liquid occurs, the quantity of the liquid in a path communicated to the outlet of the diaphragm pump is decreased due to the back stream. The decrease of the liquid can be compensated by the decrease of the volume of the liquid accumulation cavity of the accumulator. Thereby, variation of the quantity of the liquid discharged from the outlet of the accumulator is reduced and the liquid can be discharged, smoothly.

Abstract: A fuel gallery has an inlet opening through which a fuel is introduced therein and a suction opening through which the fuel flows between the fuel gallery and a compression chamber. A pulsation damper is supported in the fuel gallery by a first and a second supporting member. The second supporting member defines an inner fuel chamber and outer fuel chamber which communicates with each other through apertures. The suction opening is located at a side wall of the fuel gallery and the inlet opening is located at a bottom wall of the inner fuel chamber which is defined radially inside of the second supporting member. The fuel discharged into the outer fuel chamber through the suction opening is introduced into the inner fuel chamber through the apertures. A flow velocity of the fuel is decreased and a pressure pulsation reduction effect of the pulsation damper is surely achieved.

Abstract: An extended passage of a press-side passage is supposed in a fuel gallery. This supposed extended passage of the press-side passage extends toward a lid member. The press-side passage is opened at the side wall of the fuel gallery. A center axis of the press-side passage is inclined in such a manner that a fuel returning from the press-side passage to the fuel gallery flows toward the lid member. A bottom-side fringe of a damper unit does not exist in the supposed extended passage.

Abstract: A fuel pump for a direct injection system having: at least one pumping chamber; a piston which is mounted sliding inside the pumping chamber in order to vary cyclically the volume of the pumping chamber; an intake duct connected to the pumping chamber and regulated by an inlet valve; a delivery duct connected to the pumping chamber and regulated by a one-way delivery valve which allows exclusively a fuel flow outgoing from the pumping chamber; and a damping device, which is placed along the intake duct upstream of the inlet valve, and comprises at least one elastically deformable damping body that has internally a closed chamber filled with pressurized gas and composed of two metal plates cup shaped and welded together at their annular edges by an annular weld without interruptions.

Abstract: Disclosed herein is a muffler of a linear compressor. In the present invention, a center of an entry pipe of the muffler is in line with that of an inhale port of a piston. Therefore, a flow loss occurred when fluid is inhaled into the inhale port from the entry pipe can be reduced, and inhale efficiency can be improved. Furthermore, the plurality of inhale ports is eccentrically disposed in a front of the piston, and each center of the plurality of entry pipes is formed to be in line with that of the inhale ports. Not only the center but also the number of the inhale port and the entry pipe are agreed, on this account, the flow loss can be decreased and the inhale volume can be increased.

Abstract: A power assist system for a motor vehicle subsystem having a component support structure is described. The power assist system comprises a fluid reservoir, a pump having an inlet for receiving a fluid from the reservoir and a pump securing structure including at least one aperture. The system additionally includes at least one fastener. The reservoir fluid outlet is directly coupled to the pump inlet and the at least one fastener secures the reservoir mounting structure by passing directly through the pump mounting structure and attaching to the motor vehicle component support structure.

Abstract: A method for operating a reciprocating positive displacement pump for the simultaneous low-pulsation discharge of a plurality of liquids, having for each liquid at least two pump chambers and displacement devices capable of movement therein, of which the one displacement device takes in liquid during the actual discharge phase of the other displacement device, and at the end of its intake stroke reverses its direction of movement, and, in a pre-compression phase, pre-compresses the liquid taken into the associated pump chamber and when a predeterminable pre-compression pressure has been achieved comes to a standstill, and remains at the standstill until the other displacement device has ended its liquid discharge, and, subsequent to this discharge, begins its own discharge. The method includes the steps of carrying out a pressure compensation during the subsequent discharge stroke preventing a pressure compensation between the individual pump chambers during the subsequent discharge stroke.

Abstract: A flexible tank has a volume-variable chamber formed so as to be sectioned by a flexible tube that is expanded or contracted in accordance with the amount of the contained chemical liquid, and adaptor parts attached to the flexible tube. A primary-side port open to the volume-variable chamber is open into one of the adaptor parts, and a secondary-side port open to the volume-variable chamber is open into the other adaptor part. The contact between the chemical liquid and air in the volume-variable chamber is suppressed to minimum level, thereby containing the chemical liquid without deteriorating the cleanliness of the chemical liquid, and improving discharge accuracy of the chemical liquid.

Abstract: Disclosed are a method and a device for suppressing vibrations (18) in an installation comprising an actuator (14) for actuating a flap (12) or a valve (70) used for metering a gas or liquid volume flow (16), especially in the area of HVAC, fire protection, or smoke protection. Vibrations (18) of the flap (12) or valve (70) caused by an unfavorable or wrong adjustment or configuration of the controller and/or by disruptive influences are detected and dampened or suppressed by means of an algorithm (1) that is stored in a microprocessor (49). Said algorithm is preferably based on the components recognition of vibrations (46), adaptive filtering (48), and recognition of sudden load variations (50).

Abstract: An oil pump in which pulsation vibration due to the dynamic pressure on the discharge port side can be attenuated. In an oil pump for transporting fluid from a suction port to a discharge port by the rotation of a rotor mounted in a pump casing, a resonator configured from an introduction path and a chamber is formed with respect to a discharge flow channel that communicates with the discharge port in the flow direction of the discharge flow channel. A channel in a direction different to the flow direction of the discharge flow channel is communicatingly formed in the vicinity of the resonator.

Abstract: The present invention provides an active, electrically powered hydraulic fluid accumulator. The accumulator includes an electric motor having its output coupled to a mechanical rotation to linear translation transducer such as a lead screw, ball spline or similar device. The output of the mechanical transducer is coupled to a piston disposed within an accumulator cylinder. The accumulator cylinder preferably communicates with a pair of inlet and outlet check valves disposed in hydraulic supply and feed lines from the system pump or sump and to the system, respectively.

Abstract: Gas of a predetermined pressure, which is equal to or higher than the atmospheric pressure, is filled in a damper chamber of a damper member that includes first and second-side diaphragms. A first-side limiting portion of a first-side cover member and a second-side limiting portion of a second-side cover member are engageable with a first-side concave portion of the first-side diaphragm and a second-side concave portion of the second-side diaphragm, respectively, to limit bulging of the damper member when a pressure of a fluid chamber is equal to or less than the predetermined pressure.