Abstract: An externally-mounted, quick-acting trigger assembly for firing blast aerators, air cannons, or the like. The trigger assembly is ideal for high temperature applications involving environmental factors such as excessive heat, humidity, and mechanical shock. The trigger comprises a symmetrical, ventilated housing that internally mounts a hollow piston. A plurality of vent orifices are radially disposed about the housing periphery, and normally covered by a resilient band forming a check valve. The trigger piston comprises a generally cylindrical base and an integral, generally conical bottom that is displaced into and out of contact with a mechanical valve seat. An air passageway through the piston is controlled by a deflectable spherical valve element that is captivated within the piston, for selectively blocking air passage through the piston by contacting an internal valve seat. This construction with internal air passageways facilitates trigger function.

Abstract: A bellows-type hydraulic accumulator includes a shell, a bellows unit, and a stay in order to accumulate pressurized liquid within a liquid chamber, divided into a fixed-volume liquid chamber and a variable-volume liquid chamber communicating with the fixed-volume liquid chamber via a communication port formed in the stay. A pipe is inserted into a liquid inlet/outlet port communicating with the fixed-volume liquid chamber, to thereby form an inflow passage inside the pipe and an outflow passage outside the pipe. A tip end of the pipe is located within the communication port of the stay with a predetermined radial clearance formed between the tip end and a wall surface of the communication port, to thereby enable pressurized liquid to be supplied to the variable-volume liquid chamber from the tip end of the pipe and to be discharged from the variable-volume liquid chamber to the fixed-volume liquid chamber via the radial clearance.

Abstract: An accumulator (1) having a housing (2) the interior of which is partitioned into a pressure sealing chamber (8) and a fluid flow-in chamber (9) by disposing an operating member (5) including a bellows (6) in the housing (2), and which is provided with a liquid inlet (14) for introducing fluid to the fluid flow-in chamber (9) from a fluid pipeline, wherein noise due to pulsation wave can be attenuated. A restriction mechanism (20) and a chamber (22) for attenuating noise generated by plusation wave are provided at the idling end of the operating member (5) or at the bellows cap (7) mounted to the end of the bellows (6).

Abstract: The present invention discloses a hydraulic fluid accumulator comprising a housing having an interior subdivided into three chambers, with the first chamber being filled with a gas and separated from the second chamber by a first media separation element, the second chamber being filled with a fluid and separated by a second media separation element from the third chamber that is also filled with a fluid and connected to a hydraulic port. To safeguard an effective separation of media within the hydraulic fluid accumulator and, thus, a significant increase in its functional safety, the present invention arranges for the second media separation element to be embodied by a metal piston delimiting a chamber that can be vented in the housing.

Abstract: A hydraulic control unit (HCU) for a vehicle brake system having an HCU body and an accumulator mounted in the HCU body. A grommet is provided for mounting the HCU body to a vehicle body and resiliently separating the HCU body from the vehicle body. The grommet defines a vent path for the accumulator and includes a hollow generally cylindrical shaft. The shaft has a closed end and an open end, and the closed end has an opening therethrough. An enlarged annular head is formed on the open end of the shaft and has an inner surface defining an axial bore therethrough. The axial bore is in fluid communication with the hollow shaft, the annular head further has a crown cut geometry providing radially extending grooves within an axial face of the annular head, the radially extending grooves being in fluid communication with the axial bore of the annular head.

Abstract: A hydraulic control unit (HCU) for a vehicle brake system having an HCU body and an accumulator mounted in the HCU body. A grommet is provided for mounting the HCU body to a vehicle body and resiliently separating the HCU body from the vehicle body. The grommet defines a vent path for the accumulator and includes a hollow generally cylindrical shaft. The shaft has a closed end and an open end, and the closed end has an opening therethrough. An enlarged annular head is formed on the open end of the shaft and has an inner surface defining an axial bore therethrough. The axial bore is in fluid communication with the hollow shaft, the annular head further has a crown cut geometry providing radially extending grooves within an axial face of the annular head, the radially extending grooves being in fluid communication with the axial bore of the annular head.

Abstract: A bellows-type hydraulic accumulator includes a main shell defining a pressure space, and a bellows unit sectioning the pressure space into a gas chamber and a liquid chamber. An auxiliary shell is disposed inside the liquid chamber and fixed to the main shell. The auxiliary shell has an auxiliary liquid chamber communicating with a liquid port. A movable wall member is disposed in the auxiliary shell in order to section the interior of the auxiliary shell into a first interior portion communicating with the liquid port and a second interior portion communicating with the liquid chamber via a communication passage formed in the auxiliary shell.

Abstract: A piston for a low pressure fluid accumulator of a hydraulic control unit of a vehicle brake system includes a cylindrical body having an outer surface defining a first end surface of the piston. The first end surface includes a plurality of interconnected ridges. The ridges have outer surfaces and form cavities therebetween. Each ridge is adapted to provide a sealing surface between the first end surface of the piston and an inner surface of a fluid accumulator in which the piston may be inserted. In one embodiment of the invention, the closed end of the piston includes a thick self-supporting wall. A thin skirt extends from the thick self-supporting wall toward the open end of the piston. A plurality of axially extending skirt support ribs is formed on the inner surface of the piston skirt.

Abstract: A method of forming a floating piston includes fabricating a piston cup, wherein the piston cup includes a top, a sidewall void of any seal-gripping irregularities, and an open end, and forming an elastomer seal over the sidewall of the piston cup. A floating piston includes a piston cup having a top, a sidewall extending about the periphery of the top and an open end, wherein the sidewall is void of any seal-gripping irregularities; and an elastomer seal formed about the sidewall of the piston cup.

Abstract: In an accumulator comprising a pressure vessel, a bellows dividing the interior of the pressure vessel into a gas chamber filled with pressurized gas and a liquid chamber which communicates with a liquid pressure circuit via a liquid introduction port, a stay member attached to the inner surface of the pressure vessel inside the bellows and provided with a communication port for communicating the interior and exterior of the stay member with each other and adapted to be closed by a part of the bellows to define a fully contracted state of the bellows, and a safety valve provided in the stay member, typically in the form of a weakened portion of the stay member, for selectively communicating the exterior of the stay member with the interior of the stay member. Thus, because the safety valve is not provided in the pressure vessel itself, the safety valve of the present invention would not affect the sealing capability of the pressure vessel.

Abstract: An accumulator assembly for managing pressurized fluid includes a housing and a partition provided in the housing moveable in response to fluid pressure imparted on the partition. A deflection member is disposed in the housing and is displaceable between a first position and a second position. The deflection member includes at least one deflection element including a first end and a second end and a flexing portion therebetween. The deflection member provides a resistive force between the first and the second positions of the deflection member in response to movement of the partition. The resistive force is substantially constant between the first and said second positions of the deflection member.

Abstract: The present invention discloses a hydraulic fluid accumulator comprising a housing (1) having an interior subdivided into three chambers (2, 3, 4), with the first chamber (2) being filled with a gas and separated from the second chamber (3) by a first media separation element (6), the second chamber being filled with a fluid and separated by a second media separation element (7) from the third chamber (4) that is also filled with a fluid and connected to a hydraulic port (5).

Abstract: A gas container has a gas inlet, a gas outlet, a variable-volume chamber connected to the gas inlet and the gas outlet and a constant force applicator acting on the variable-volume chamber so that constant gas pressure prevails in the variable-volume chamber, regardless of variations in the chamber's volume. The constant force applicator is formed by a spring and a force transfer mechanism that interact with each other through a center of rotation (14) and an application point. The force transfer mechanism varies the distance between the center of rotation and the application point according to the variation in the volume of the variable-volume chamber.

Abstract: A water hammer arrestor having an insert molded plastic body with a metal attachment at one end to install to the supply line. A piston disposed inside the bore of the plastic body includes a flexible skirt that faces the water supply. The skirt includes a sharp edge that provides a scraping/cleaning action.

Abstract: A hydropneumatic pressure accumulator, includes a gas chamber, an oil chamber, and a pair of metal bellows separating the chambers. An end plate is displaced according to volume changes in the gas chamber and oil chamber. A valve releases and blocks the flow of hydraulic fluid out of and into the oil chamber and has a valve lifter that controls the valve. During the displacement of the end plate, corresponding to a volume expansion in the gas chamber exceeding a predetermined maximum value, the valve lifter can be displaced by the end plate into a position which blocks the valve. The valve lifter is connected in a fixed manner to the end plate of the metal bellows. The valve can be blocked in two opposing directions by the displacement of the valve lifter.

Abstract: A pulsation dampener apparatus and method for dampening pulses within a fluid flow line during well drilling operations. The pulsation dampener apparatus comprises a cylindrical body having an annular chamber, a piston slidably disposed within the annular chamber, a gas column within the annular chamber and a means of communicating pulses from the fluid flow line to the piston. The piston is operated against the gas column to dampen the pulses within the fluid flow line.

Abstract: The invention is a subsea pump that includes pumping elements, each pumping element including a pressure vessel with a first and a second chamber therein and a separating member disposed between the first and second chambers. The first and second chambers are hydraulically connected to receive and discharge a hydraulic fluid and a drilling fluid, respectively. The separating member moves within the pressure vessel in response to a pressure differential between the first and second chambers. A hydraulic power supply is arranged to pump the hydraulic fluid to the first chamber of each of the pumping elements. A valve assembly is hydraulically coupled to the first chambers of the plurality of pumping elements and to the hydraulic power supply. Volume measurement devices are arranged to measure volumes of each of the first chambers and the second chambers.

Abstract: The invention relates to a hydropneumatic accumulator comprising a bellow (19), which, inside the accumulator housing (1), separates a gas chamber (17) from an oil chamber (13) and which is fastened with one end thereof to the accumulator housing (1) so that the oil chamber (13) is delimited by the inside of the bellow (19). Said bellow is sealed on the other free end by means of a closing body (21) that moves according to changes in volume of the gas chamber (17) and of the oil chamber (13). The hydropneumatic accumulator also comprises a valve (31), which enables a hydraulic fluid to flow out of and into the oil chamber (13) or which blocks the flow of said hydraulic fluid. The valve can be transferred into its blocking position by the closing body (21) when the closing body (21) undergoes a movement corresponding to an increase in the volume of the gas chamber (17) that exceeds a predetermined maximum value.

Abstract: A surge suppression apparatus includes a housing, and a flexible diaphragm. The housing is divided into first and second sub-chambers by the diaphragm. The first sub-chamber is connected to a supply of liquid under pressure. The second sub-chamber contains a gas under pressure. The apparatus further comprises a gas reservoir in communication with the second sub-chamber so as, in use, to provide an effective volume which is substantially larger than that of the second sub-chamber.

Abstract: A hydraulic accumulator, especially a hydraulic damper, includes a connecting piece for producing fluid communication between the interior of the hydraulic accumulator and at least two fluid connecting lines in a fitting. The connecting piece is connected to the fitting. The connecting piece is provided with at least one annular channel in its outer periphery in such a way that the connecting section of the connecting piece leading to the interior of the hydraulic accumulator is in fluid communication with the connecting line in the fitting through the annular channel. A compact construction is obtained that avoids the disadvantages of long lines.

Abstract: The present invention discloses a pressure fluid accumulator with a housing having its interior subdivided into two chambers by a media-separating element, the first chamber being filled with a gas and the second chamber being filled with a liquid, and wherein in a hydraulic port a bottom valve is provided whose closure member is operable by the media-separating element and which permits filling the second chamber with liquid and prevents complete evacuation of the second chamber. In order to prevent a damage of the bottom valve and an inadvertent escape of fluid and, thus, ensure a considerable increase in the reliability in operation, according to the present invention, the closure member can be moved by the media-separating element to adopt a position in which it fulfils the function of a hydraulic piston.

Abstract: An accumulator for a fluid system includes a canister and an end cap at one or both ends of the canister. The end cap has a cylindrical peripheral surface, with a groove or channel having gradually rounded or curved sidewalls, formed circumferentially around the cap, and spaced from the axial ends of the cap. An annular, radially-outward projecting flange is provided at the axially outer end of the cap, and serves as a locating feature for the cap when it is inserted into the canister. A forming tool such as a crimping machine is used to mechanically deform the canister into the groove. The rounded shape of the groove creates a permanent, fluid-tight attachment with the canister. The accumulator can include either a piston or bladder.

Abstract: An accumulator for a fluid system includes a canister and an end cap at one or both ends of the canister. The end cap has a cylindrical peripheral surface, with a groove or channel having gradually rounded or curved sidewalls, formed circumferentially around the cap, and spaced from the axial ends of the cap. An annular, radially-outward projecting flange is provided at the axially outer end of the cap, and serves as a locating feature for the cap when it is inserted into the canister. A forming tool such as a crimping machine is used to mechanically deform the canister into the groove. The rounded shape of the groove creates a permanent, fluid-tight attachment with the canister. The accumulator can include either a piston or bladder.

Abstract: A system for damping pressure pulses is provided, including a channel for permitting fluid flow between a first chamber and a second chamber, a piston for varying a fluid flowing space such that pressure pulses in fluid are damped, and a flexible wall for absorbing pressure pulses in fluid, wherein the flexible wall is connected to the piston by a transmitting rod such that a movement of the piston results in a deformation of the flexible wall and vice versa.

Abstract: A pressure accumulator has a housing having at least one pressure medium opening, a diaphragm chamber arranged inside the housing and having a side wall which is at least partially deformable, and a pressure medium chamber arranged outside of the diaphragm chamber, the pressure medium chamber at least partially being limited by a partially permeable material which allows an exit of gas from the pressure medium chamber but prevents an exit of a pressure medium from the pressure medium chamber.

Abstract: A pressure accumulator apparatus is disclosed for use in offshore drilling and production which comprises a pressure vessel (30) having a first compartment (34) and a second compartment (38), a partition (32) between the first compartment and the second compartment, a means for admitting fluid at ambient pressure into a portion (44) of the first compartment, a means for controlling an amount of hydraulic fluid ejected from a portion (46) of the second compartment, a first piston member (48) circumscribed by an interior wall of the first compartment, said first piston member being capable of sliding within the first compartment, a second piston member (50) circumscribed by an interior wall of the second compartment, said second piston member being capable of sliding within the second compartment, and a means (52) for connecting the first piston member and the second piston member.

Abstract: A fuel system 10 which selectively receives, stores and delivers volatile fuel 16. Fuel system 10 includes a variable volume fuel tank 12 having a movable piston 22 which is attached to a pair of bellows diaphragm members 26, 28. Members 26, 28 selectively contract and expand to move piston 22 within tank 12, effective to alter the volume of the fuel containing portion 14 of tank 12, thereby maintaining fuel 16 in a pressurized state and substantially preventing the accumulation of vapors within tank 12.

Abstract: An accumulator including a housing with a gas chamber and a liquid chamber therein. A primary piston is moveable in the housing and connected to the housing by a primary bellows sealing the gas chamber with respect to the liquid chamber. A secondary piston is moveable with respect to the primary piston and connected to the primary piston by a secondary bellows sealing the secondary piston with respect to the primary piston.

Abstract: A hydraulic accumulator assembly for a hydraulic brake system. The accumulator assembly includes a pump housing having therein at least one accumulator bore. The accumulator bore has an axis and an inner wall. A piston is movable within the accumulator bore and divides the accumulator bore into an accumulator chamber, which is communicable with the hydraulic brake system, and a spring chamber. There is a spring in the spring chamber for biasing the piston in the direction of the accumulator chamber. A passageway in the pump housing is closely spaced from the inner wall so as to form a relatively thin wall thickness between the passageway and the inner wall. A vent bore is punched in the inner wall and communicates between the spring chamber and the passageway. The vent bore is punched in a direction away from the axis.

Abstract: A hydraulic control unit for a motor-vehicle braking system includes a pump (32) delivering hydraulic fluid under pressure, the pump being capable of being controlled by an electronic control unit (ECU) and supplying the hydraulic fluid for at least one braking device (22) which is coupled to a wheel of the vehicle, and also a first reservoir (34) for pressureless hydraulic fluid, which is assigned to the pump (32) on the input side, and a second reservoir (36) for hydraulic fluid under pressure, which is assigned to the pump (32) on the output side. In order to design the control unit for good packaging and installation space considerations, the pump (32), the first reservoir (34), and the second reservoir (36) are arranged in a common casing (60), and integrated as an electrohydraulic modular unit.

Abstract: A system, device and method of sealing a fluid accumulator assembly to a modulator body in a hydraulic fluid brake system provides a fluid modulator having a body with at least one fluid passageway formed therein. At least one socket is formed in a surface of the body in communication with the at least one fluid passageway. An accumulator assembly includes a housing with an open end. The open end includes a tapered lead-in, the tapered lead-in being positioned in the socket. The socket includes a seizing taper configuration, the angle of the seizing taper being complementary to an angled portion of the tapered lead-in. The housing of the accumulator includes a stake groove. Material from the body is staked into the stake groove, retaining the accumulator to the body thereby.

Abstract: This invention relates to a method and apparatus for installing underwater synthetic pipelines whereas the pipeline has single or multiple ballast tubes, attached to the pipeline through the use of a band or fabric strap to contain the pipeline components in a fixed bundle, around specifically shaped primary ballast weights designed to impart the minimal amount of ballast weight necessary for sinking the pipeline to the sea bed. The pipeline and all of its parts are corrosion-resistant, and has the ballast weight reduced to the minimum required during launching and sinking phases. The final ballast weight is achieved after the pipeline has been positioned on the sea bed by filling the ballast tubes, attached to the pipeline, by injection or other means, with a mixture consisting of a substance which possesses a relative density that is greater than water.

Abstract: An apparatus connectable to a brake master cylinder for regulating pressure in a hydraulic brake system. The apparatus includes an outer casing housing a cylinder portion and a piston slidable therewithin. A pressure chamber forms between the cylinder wall and the piston. The piston includes a seal within an outer groove to prevent fluid leakage. The cylinder portion includes an inlet hole for hydraulic fluid flow into the cylinder and an air discharge valve. A fixing member having an extension with a concave portion is threadably attached to the lower end of the case, and a rod portion of the piston slidably fits into the concave portion. A spring providing a constant pre-pressure is located between a shoulder of the piston and a pressure controlling member abutting the fixing member, such that the end of the rod remains a fixed distance from the bottom of the concave portion.

Abstract: A piston accumulator can be used for hydraulically actuating the discharge unit in non-automotive bulk commodity vehicles. The accumulator cylinder has a tappet which can be axially displaced within the cylinder. When a defined load pressure is reached in the oil chamber of the cylinder, the tappet can be displaced by a piston to actuate a control valve. The valve serves as shut-off device for the loading fluid stream flowing to the oil chamber and is positioned as a detachable module on the exterior face of cylinder cover in such a way that it can be actuated by the outer end of the tappet. The tappet is guided towards the outside by passing in a sealed manner through the cylinder cover.

Abstract: A surge suppression apparatus including a chamber divided into first and second sub-chambers by a diaphragm, a diaphragm follower maintained in contact with the diaphragm and, in use, following the movement of the diaphragm in response to a pressure differential between the first and second sub-chambers, the position of the diaphragm follower relative to the chamber wall determining the existence or otherwise of a communication pathway between the second sub-chamber and a gas inlet and the second sub-chamber and a gas outlet.

Abstract: Disclosed is an accumulator comprising: a pressure vessel; an elastic bellows in which a compressed gas is sealed, an end of the bellows being fixed to an interior of the pressure vessel; a flow path having an opening communicating with the interior and an exterior of the pressure vessel; a valve connected to a movable end of the bellows to operatively close the opening according to elastic motion of the bellows; and a hydraulic chamber partitioned from a gas chamber formed in an interior of the bellows containing the compressed gas. The valve comprises an upper surface which can cover the opening, and plural circular protrusions which surround the entire circumference of the opening and can closely contact the circumference of the opening.

Abstract: A compressor includes a discharge chamber into which pressurized refrigerant gas is intermittently discharged. The pressurized refrigerant gas in the discharge chamber is sent to an external refrigerant circuit. A chamber for accommodating a resonance suppressing adapter is located between a discharge muffler and the external refrigerant circuit. The adapter includes a float valve and a spring. The float valve can move between a position connecting the accommodation chamber to the muffler and a position disconnecting the accommodation chamber from the muffler. The spring urges the float valve to its closed position. The force of the spring is determined such that the discharge pulse frequency of the refrigerant gas does not coincide with the natural resonance frequency of the external refrigerant circuit or at least such that the amplitude of pressure variations of the refrigerant gas is reduced.

Abstract: A tubular element (100) which is inserted into a liquid-conducting conduit (10) includes an annular chamber (25) that is delimited radially towards the inside by a tubing section (30) made of a material with an elastically flexible surface. The tubular element (100) serves as a flexible damping conduit section, or, if the annular chamber (25) is connected with a partial vacuum chamber at a connector (21), and the tubing section (30) is inflated into the annular chamber (25), as a means for temporarily holding an amount of liquid, for example in order to withdraw a dye bath from the exit slit of an application device for dyeing textile webs.

Abstract: Disclosed is an accumulator comprising: a pressure vessel; an elastic bellows in which a compressed gas is sealed, an end of the bellows being fixed to an interior of the pressure vessel; a flow path having an opening communicating with the interior and an exterior of the pressure vessel; a valve connected to a movable end of the bellows to operatively close the opening according to elastic motion of the bellows; and a hydraulic chamber partitioned from a gas chamber formed in an interior of the bellows containing the compressed gas. The valve comprises an upper surface which can cover the opening, and plural circular protrusions which surround the entire circumference of the opening and can closely contact the circumference of the opening.

Abstract: A combined oil tank and oil accumulator vessel having an internal chamber, and a moveable spring-loaded barrier within the internal chamber defining a low pressure oil tank portion and a high pressure accumulator portion separated by the moveable barrier. The combined oil tank accumulator provides the advantages of more consistent oil flow supply as a result of the integral accumulator, but with reduced weight, reduced oil volume requirements, and constant oil levels when compared with conventional external accumulators.

Abstract: The dispensing assembly for transferring at least two liquid components from a remote source to a metering device and for replenishing component accumulators independently of whether the unit is metering or not, comprises a metering device for at least two components with a metering pump and a remote bulk container for each component, whereby for each component the bulk container is connected via a low pressure transfer pump and low pressure transfer hose to a pump inlet adaptor of the metering pump as well as to an accumulator assembly situated immediately before the inlet of the metering pump. This allows the use of low pressure transfer and low pressure metering systems instead of high pressure metering and high pressure transfer systems and hence lower cost dispensing assemblies.

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 hydraulic control unit of an electronically-controlled vehicular brake system includes a housing having a bore. The bore is in fluid communication with a first fluid passage leading to an outlet of a pump. The bore is also in fluid communication with a second fluid passage leading to a master cylinder. A retainer cap is mounted in the bore. A piston is slidably received in the retainer cap. The piston includes a fluid channel providing fluid communication between the first and second fluid passages. A spring is positioned between the retainer cap and the piston to urge the piston from the retainer cap. A check valve assembly is mounted in the fluid channel of the piston that permits only one-way fluid flow from the first fluid passage to the second fluid passage. The compensator assembly provides a controlled amount of additional displacement of a master cylinder piston when the brake system is operating in an electronically activated mode only.

Abstract: The present invention relates to a pressure fluid accumulator which includes a housing with a pressure fluid port and a body which is movably arranged in the housing and isolates at least two chambers in the pressure fluid accumulator from one another. The body is configured as a metal pleated bellows which is movable in the housing and encloses the one chamber.

Abstract: A hydraulic circuit for an automatic transmission operable to reduce time delay in shifting includes a source supplying pressurized fluid through a feed orifice and a charging circuit including an accumulator. The accumulator is downstream of the feed orifice, and operates to reserve pressurized fluid supplied by the source. The hydraulic circuit also includes a clutch circuit, downstream of the charging circuit, which has a clutch hydraulically actuated and operable to generate torque to shift the automatic transmission. A valve is interposed between the charging circuit and the clutch circuit to open a flow path therebetween to start a shift cycle of the clutch. When the valve is actuated, the pressurized fluid is released from the accumulator and flows to the clutch circuit to minimize delay in the shift.

Abstract: An accumulator comprising: (a) a vessel body having an inner space; (b) a deformable partition member fixedly disposed in the inner space so as to fluid-tightly divide the inner space into a gas chamber charged with a suitable pressurized gas, and a fluid chamber connectable through a communicating passage with a piping system for permitting flows of a working fluid through the communicating passage between the piping system and the fluid chamber in response to variations of the pressure of the working fluid, so as to minimize the variations; and (c) an opening and closing device disposed in the communicating passage, the opening and closing device opening the communicating passage thereby to permit the flows of the working fluid except when a rate of increase of the pressure of the working fluid is higher than a predetermined upper limit, the opening and closing device closing the communicating passage thereby to inhibit the flows of the working fluid when the rate is higher than the predetermined upper limi

Abstract: A fluid flow control device for use in heat pump systems is provided. The device includes an elongated body shaped to define a plurality of lines of contact along the elongated body which reduces operational noise and which improves fluid flow characteristics. In a preferred embodiment, the device includes four or six lines of contact. The device may also include a highly angled nose region to improve seating and stability.

Abstract: A water hammer arrester constructed with a cylindrical housing having a closed upper end and an internal pressure chamber. A piston slidably installed within the housing to receive a reaction force medium such as gaseous nitrogen, provides a space that communicates with an integral pressure chamber within the closed upper end of the housing. A threaded connector bearing a nipple circumscribed with a plurality of circumferential grooves is crimped into the neck of the lower end of the housing.

Abstract: The present invention relates to a pulsation suppression device which is interposingly used in a liquid transporting pipe through which a chemical liquid such as a surface washing liquid for washing an IC is transported by a reciprocal pump. The pulsation suppression device of the present invention has: a bellows which partitions the interior of the device body having a sealed container-like shape, into a liquid chamber and an gas chamber; an operating rod which is reciprocated in interlock relationship with the bellows; and an extension and contraction restricting mechanism which, when the bellows extends to a predetermined value, is contacted in parallel with a closed end face of the bellows, thereby restricting further extension of the bellows. Furthermore, the pulsation suppression device of the present invention has a guide for making the reciprocal operation of the operating rod coincident with the extension and contraction directions of the bellows. The guide is made of a low-friction resin material.

Abstract: An improved brake equalizer apparatus for equalizing fluid pressure and damping shock waves or pressure surges in fluid lines of a fluid pressure-actuated system, such as a hydraulic brake system. The apparatus has a shorter reaction time than a conventional brake equalizer, and can be manufactured with smaller overall length and weight. An important feature of the apparatus which results in reduced brake equalizer reaction time is an improved brake equalizer piston. The piston of the invention is shorter than a conventional brake equalizer piston (the ratio of the inventive piston's length to the length of the shock absorber which it abuts is substantially less than 0.5, and is preferably equal to about 0.23). The piston of the invention is also lighter than a conventional brake equalizer piston, and is preferably made of a hard, non-compressible, self-lubricating material.