Abstract: The invention relates to a pressure regulating valve comprising a valve body having one or more inlet openings and one or more outlet openings for a pressurized medium, an internal cavity connecting said inlet and outlet openings and a piston which is in contact with a valve seat between inlet and outlet and is axially slidable in the cavity in the valve body against a spring, which biases the piston to a closed position, whereby the valve opens when a predetermined pressure acts on the piston. The valve body is provided with an opening at its outlet side, where the cross-section of the opening is smaller that the cross-section of the cavity and which opening is in connection with a volume limited by the piston and the lower section of the internal cavity, whereby the pressure drop across the valve dampens variations in the volume.

Abstract: A variable capacity type compressor has a swash plate, pistons reciprocating in the cylinder bores, a suction chamber, and a discharge chamber. A check valve arranged in the compressor. The check valve has a valve seat member having a flow passage and a valve seat, a case attached to the valve seat member, and a valve element arranged in the case for cooperation with the valve seat. The case has a communication hole formed therethrough to allow the gas to flow from the flow passage through the communication hole to the outside circuit. The case has a damper chamber formed therein on the back side of the valve element to damp vibration of the valve element.

Abstract: A variable capacity type compressor has a swash plate, pistons reciprocating in the cylinder bores, a suction chamber, and a discharge chamber. A check valve arranged in the compressor. The check valve has a valve seat member having a flow passage and a valve seat, a case attached to the valve seat member, and a valve element arranged in the case for cooperation with the valve seat. The case has a communication hole formed therethrough to allow the gas to flow from the flow passage through the communication hole to the outside circuit. An annular groove is formed in the outer peripheral surface of the valve element to allow a leaking gas to flow from the clearance space between the valve element and the valve housing to the exterior of the valve housing.

Abstract: A pressure relief valve for an oil pump of an automotive internal combustion engine. The pressure relief valve comprises a wall defining thereinside a valve accommodating bore. The wall is formed with a plurality of pressure relief holes including first and second pressure relief holes through which oil in the valve accommodating bore is releasable to an outside of the valve accommodating bore. A valve body is provided to be slidably movable in the valve accommodating bore and along the wall under balance between oil pressure acting on the valve body in a first direction and biasing force of a spring acting on the valve body in a second direction opposite to the first direction. In this arrangement, the second pressure relief hole is opened after the first pressure relief hole is opened to have a maximum cross-sectional opening area in a process of movement of the valve body in the first direction along the axis of the valve accommodating bore.

Abstract: A relief valve assembly, comprising: a relief valve; a valve housing including a valve path along which the relief valve can slide; a relief inflow portion formed on one end of the valve housing; and relief discharge portions formed at a substantially intermediate location of the valve path of said valve housing and provided with small aperture portions and large aperture portions formed in communication with one another; wherein a side where the relief discharge portions are provided with said small aperture portions is the side near the relief inflow portion.

Abstract: A relief valve for regulating discharged oil pressure of an oil pump at a predetermined level comprises a cylinder including a bore therein and relief grooves formed symmetrically relatively to an axial center of the bore, while each of the relief grooves has a respective opening to an inner peripheral portion of the bore; a valve body disposed in the cylinder so as to be slidably moved in the bore in response to the discharged oil pressure supplied into the bore at one side of the valve body; a spring provided in the other side of the valve body constantly urging the valve body toward the one side of the valve body so as to close the openings of the relief grooves by the valve body; and an adjusting means for adjusting a change rate of an opening area of the relief grooves relatively to one slide movement of the valve body against the force of the spring so that the change rate of the opening area at the beginning of slide movement of the valve body is smaller than that at the end of the slide movement of th

Abstract: A microvalve device for controlling fluid flow in a fluid circuit. The microvalve device includes a body defining a chamber, an inlet port and an outlet port. The inlet port is connected in fluid communication with the chamber and is adapted for connection with a first fluid source. The outlet port is connected in fluid communication with the chamber and is adapted for connection with a second fluid source. A check valve is movably disposed in the chamber for movement between a closed position and a fully opened position by differential pressure across the check valve. When the check valve is placed in the fully opened position, fluid is allowed to flow from the inlet port to the outlet port through the chamber. When placed in the closed position, the check valve restricts fluid from flowing between the inlet and outlet ports.

Abstract: Differential valve for a sub-sea flexible pipe having a valve body comprising an upper part communicating with the outside via at least one upper communication passage and a lower part communicating with at least one annulus of the flexible pipe via at least one communication duct, an internal chamber formed in the valve body and at a chamber pressure (Pc), a main clacker element mounted in the internal chamber and movable between a closed position and an open position, and urged toward the closed position by a first spring, a secondary clacker element mounted in the upper communication passage also movable between a closed position and an open position, the secondary clacker element being urged towards the closed position by a smaller preloaded spring, so that the pressure in the internal chamber is not below the exterior pressure (Pe) when the secondary clacker element is in the closed position.

Abstract: An air flow sensor and method for filling a filter press which detects slowing and/or intermittent stoppage of the feed pump and signals a controller associated with a pressure regulator to increase the pressure of the air supplied to the feed pump. The air flow sensor includes a spring-biased piston slidably movable within a housing, which piston defines a flow passage therein and carries a magnet thereon. A switching device is mounted on the housing and detects the position of the piston magnet, and when the piston approaches the closed position, the switching device transmits a signal to step-up the air pressure to the feed pump.

Abstract: The present invention provides an oil pressure relief valve having grooves along the wall of the piston. These grooves channel pressurized oil through areas of the vents which are most susceptible to debris buildup. This channeling of pressurized oil acts to flush the vents and wipe away debris. As a result, the valves are able to operate freely.

Abstract: A jet pump includes a jet pump nozzle and a pressure relief valve. The pressure relief valve includes an inlet, a valve seat around the inlet, and an unregulated outlet downstream of the valve seat. A valve member is mounted in the valve body to move between a closed position and an open position, and a spring reacts against the valve body to bias the valve member to the closed position. The valve seat defines a first area A1, the valve member defines a second area A2, and the ratio A2/A1 is selected to provide a hysteresis between opening and closing pressures as measured at the inlet of at least 6 psi. This hysteresis improves efficiency of operation of the jet pump nozzle.

Abstract: An air pump is provided with a head, a cylinder, a valve chamber, a branch duct, an air discharging hole, and an elastic member. The cylinder comprises a first air chamber, and a second air chamber smaller in the cross-sectional area than the first air chamber. When air pressure in an inflatable object being inflated by the air pump has reached a certain pressure level, a displacement member of the valve member is caused to displace so as to allow the air in the first air chamber to be released into the atmosphere via the branch duct and the air discharging hole. In the meantime, the pumping action is automatically switched to the second air chamber through which air is continuously pumped into the inflatable object.

Abstract: A snubber valve is described which comprises a valve member slidable within a bore provided in a valve body. The valve member includes a region arranged to engage a seating, a spring biasing the valve member towards the seating. The spring engages a spring abutment region of the valve member. The valve member is provided with a passage which provides a flow path between a second end of the valve member and a part of the valve member between the first region and the spring abutment region.

Abstract: A low profile valve for discharging pressurized air to a system for utilizing such pressurized air. The valve includes a housing for mounting in or to an associated structure, and has at least one opening through which pressurized air is directed to and from the valve. A piston is located in the housing for axial movement therein, and the piston has a face portion containing a seal for sealing the piston against a fixed surface of the associated structure. In addition, a spring can be located about the piston for biasing the piston in the direction of the fixed surface.

Abstract: A valve releases fluid from a high pressure source to a low pressure receiver and includes a housing (301) having a first cavity (312), a second cavity (313), an annular interior sealing surface (318), an elastomeric ring (303), a poppet (302) and an actuator (304) for controlling the poppet's axial movement disposed coaxially within the housing (301). The poppet has a substantially cylindrical side wall, forming an external sealing surface (317). The poppet has fluid channels (310) for channeling fluid from the first cavity (312) radially outward through at least one orifice (311) in the side wall. When closed, the elastomeric ring (303) contacts the exterior sealing surface (317) and the interior sealing surface (318) sealing the first cavity (312) from the second cavity (313). When open, the orifice (311) is disposed relative to the elastomeric ring (303) such that fluid exiting the orifice deforms the elastomeric ring (303) outwardly forming a gap (314).

Abstract: A check valve includes an outer valve body and an inner poppet valve moveable relative to the valve body and spring-biased into a closed position. The inner poppet valve has first and second stage openings. The first stage preferably has a single, relatively small through-hole into the chamber of the poppet valve, while the second stage preferably has multiple openings of a larger diameter. The first and second stage openings are spaced axially along the poppet valve, with the first stage opening being located closer to the valve head of the poppet valve than the second stage openings. In the closed position, fluid flow is blocked through both the first and second stage openings. When the cracking force of the valve is exceeded and the valve head moves away from the valve seat, fill flow occurs through the first stage opening and is restricted through the second stage openings.

Abstract: The invention relates to a starting valve for progressive build-up of pressure in an installation through which pressure medium flows, comprising a housing with a first opening for coupling to a first component of the installation and a second opening for coupling to a second component of the installation, a channel connecting the two openings, a piston which is movable to and fro in the housing between a closed and an open position and has at least one first and one second pressure surface, wherein on the first pressure surface the pressure prevailing in the region of the first opening applies and on the second pressure surface the pressure prevailing in the region of the second opening applies, means for maintaining a low flow of pressure medium--while the piston is in the closed position--from one opening to the other, and a spring element which pushes the piston into the closed position. According to the invention all pressure surfaces have an action which pushes the piston into the open position.

Abstract: A valved nozzle for spraying fuel oil and method therefor includes an inlet, a discharge chamber downstream of the inlet, and a flow restricting orifice downstream of the discharge chamber. The pressure in both the inlet and the discharge chamber urges the valved spray nozzle to open. The valved spray nozzle abruptly opens by the inlet pressure rising above a predetermined upper pressure limit and abruptly closes upon falling to a lower limit. The span between the upper and lower limits defines a very definite deadband across which leakage is avoided at intermediate pressures.

Abstract: The invention concerns a fuel check valve to prevent unintentional siphoning of fuel from a cell should a fuel delivery line by severed. The check valve includes a valve housing having a fluid conduit coupling a first and second orifice. An internal seat is formed in the fluid conduit to receive a needle body having a seat mating portion that is complementary to the internal seat, thereby creating a fluid barrier when brought into compressive contact therewith. Compressive contact is created by a compression spring located intermediate between the valve housing and the needle body. When the check valve is included in a fuel delivery system, a partial vacuum created by a fuel pump downstream from the valve overcomes the spring bias to cause the needle body to unseat, thereby permitting fuel flow.

Abstract: An undersea hydraulic coupling member is disclosed having angled flow ports to prevent ingress of debris into the hydraulic lines, and having a bleed passage to allow trapped hydraulic fluid to bleed off when the coupling members are disconnected. The poppet valve in combination with the angled flow ports helps keep the hydraulic system clear of debris when the members are disconnected.

Abstract: The invention provides a self-cleaning inlet head for a fluid, operable in a first, draining, mode and in a second, backflushing, mode, including a body having a front end and a rear end; a piston slidably mounted in the body and having having a front face and a rear face; a first space extending between the rear end of the body and the rear face of the piston and a second space extending between the front face of the piston and the front end of the body; a bore connecting the first space and the second space; a valve mounted in the first space for closing off the bore during the second mode of operation; an aperture for access of the fluid from outside the head into the second space in the first mode of operation, and for exit from the second space in the second mode of operation, wherein, at the onset of the second mode of operation, the valve closes off the bore and subsequently moves the piston, thereby initiating a mechanical shearing action loosening any occluding matter in the aperture.

Abstract: A valve is disclosed having a valve piston slidably movable within a valve casing. The valve also includes a spring biasing the valve piston against a valve seat such that the valve is normally closed, but may be opened when the pressure acting on the valve piston exceeds the biasing force of the spring. In order to assure perfect sealing between the valve piston and the valve seat, the valve seat is formed on a member which is movably mounted in the valve casing by a generally annular elastic element. The elastic element connects the valve seat to the valve casing, as well as a shoulder extending from the valve casing into the valve chamber,d such that an axial clearance exist between the valve seat member and the shoulder, and a radial clearance exists between the valve seat member and the valve casing under all operating conditions of the valve. Such clearances enable the valve seat member to move axially and radially so as to assure perfect sealing between the valve seat and the valve piston.

Abstract: Pressure limiting valves intended for use in underground mining and tunnel construction are able to release the pressure medium discharged if an overload occurs without problems into the return line, since the occurring back pressure is directly neutralized in the pressure limiting valve. For this purpose a discharge of the pressure medium is provided even before the spring chamber, for which purpose the crossbores arranged there are constructed in such a way that they expand, forming a water chamber with increased volume. This water chamber is located in ring form around the valve piston that is exposed in this area and is connected via return bores to the return line. The water chamber with accordingly large volume makes it possible that the back pressure acts simultaneously on the spring and the valve piston, so that the described neutralization takes place.

Abstract: A valve device for restricting fluid flow has a hollowed piston member having a closed piston end wall and an open piston seat end. The piston end wall is integral with a second piston wall which extends to the piston seat open end which, in turn, opens into a chamber defined by the piston end wall and second wall. The piston second wall is positioned in slidable contact with a housing interior wall surface and has at least one aperture positioned therethrough for a fluid to flow in or out of the piston from the chamber so that upon the piston being reciprocated in the housing, when the piston seat end is seated in a seat integral with the housing, the at least one second wall aperture is confined by the housing interior wall surface to close the valve to fluid flow and so that when the piston is at a position displaced away from the seat, the at least one aperture is unconfined by the housing so that the valve is open to flow of fluid.

Abstract: A plunge valve for closing and for opening a connection in a hydraulic conduit comprises a plunge (37) which is slidably movable in the hydraulic conduit (5, 5A) under the influence of the pressure in a section (5A) of the conduit on the inlet side of said conduit adjacent to the plunge between a first, open position, when the pressure in said section (5A) is high, in which position the plunge is withdrawn and communication is established, and a second, closed position, in which the pressure in said section is low, in which position the plunge shuts off said connection.

Abstract: A flow distribution and control device for connection to a fluid supply includes an inlet assembly and an outlet assembly. A valve member is positioned in a flow path between the inlet and outlet assemblies and moves to an open position in response to increased differential pressure between the inlet and outlet assemblies. Discharge holes selectively permit communication between the inlet and outlet assemblies when the valve member is in the open position. A cylindrical flow distribution ring seated in the outlet assembly defines a radial collector gap that has a larger diameter than that of adjacent radial interior surfaces of the ring and inlet assembly. The flow path is open when the valve member is in an open position and at least one of the discharge holes is exposed to the collector gap.

Abstract: A pressure limiting valve has a piston sliding inside a piston bore in a piston guide. A valve spring and a spring plate move in a spring sleeve which has an adjusting screw at an end opposite the spring plate. The spring plate has flow-through openings. The piston extends into a blind bore in the spring plate. The piston guide, which forms the bottom of the spring chamber, has a funnel-shaped recess which extends to the inside wall of the spring sleeve. The spring plate support surface for the valve spring is below the top of the piston.

Abstract: A shaft-mounted piston is reciprocally disposed on the axis of a valve inlet opening such that increased pressure from within the motor casing of a centrifugal compressor causes the piston to move in the direction of the refrigerant flow, against a biasing means, to increase the flow of refrigerant through the opening, and to thereby regulate the pressure drop across said valve to a predetermined level. The shaft has an extended portion projecting through the piston toward the motor casing such that when the compressor is shut down and the pressure is thus greater in the valve than in the motor casing, the piston can move out of the inlet opening to the extended portion of the shaft to thereby allow the unrestricted flow of refrigerant into the motor casing.

Abstract: A pressure relief valve in a cap, and more particularly a pressure relief valve in a cap for use with pressure vessels in chromatography systems. In one exemplary application the valve is contained within the cap of a pressure chromatography column. In a second exemplary application the valve is contained within the cap of a mobile phase reservoir of a high performance liquid chromatography system. The valve generally comprises a body, a sealing element, and a force applying means. The body of the valve is formed into the cap and defines an inlet in communication with the interior of the column, an outlet in communication with ambient air, a first bore, and a seat. The sealing element slides within the body and is urged into sealing contact with the seat by the force applying means. The sealing element has a raised lip at its sealing face to provide a substantial sealing force per unit of sealing surface area.

Abstract: A check valve having a valve housing with an outlet fluid passage and a housing valve cavity in communication with each other. A valve body has an inlet fluid passage and a body cavity in communication with each other. The valve body is sealably secured to the valve housing. A valve poppet is slidably mounted within the body cavity. The valve poppet has a central cavity. A side wall of the valve poppet has a poppet through hole which is in communication with the central cavity. The valve poppet has a poppet shoulder portion and an extension portion. A seal disk has a seal disk through hole into which the extension portion of the valve poppet is positioned. The seal disk is positioned within the housing valve cavity. A closure spring is used to normally urge the valve poppet into a closed position in which the valve poppet preferably abuts a sealing surface of the valve body.

Abstract: A low pressure gas flow check valve is formed by a relatively thin disc having an central aperture and valve seat is adapted to be interposed between adjacent flanges in a pipeline. The check valve includes a valve body axially connected with one face of the disc. The valve body has inlet and outlet bores and a valve for seating on the valve seat and is surrounded by the bore of the pipeline. A spring normally urges the valve to its sealed position to prevent downstream fluid tending to flow in an upstream direction.

Abstract: A pressure limiting valve having high flow rates, especially for use as a safety valve with mine props and the like, uses a tubular main valve member whose interior communicates with the valve inlet and has lateral bores opening into the valve outlet when the bores are shifted past a sealing ring in the valve housing. A pilot valve body is received in the tubular valve and the valve spring bears upon the tubular valve. The main valve is shifted by differential pressure.

Abstract: A pressure-limiting valve having high flow rates, especially for uses as a safety valve with mine props and the like, uses a tubular main-valve member whose interior communiciates with the valve inlet and has lateral bores opening into the valve outlet when the bores are shifted past a sealing ring in the valve housing. A pilot-valve body is received in the tubular valve and the valve spring bears upon the tubular valve. The main valve is shifted by differential pressure.

Abstract: A safety valve including a brass valve body having a through bore provided with a circular sharp-edged valve seat and another sharp edge. A valve stem carrying a ball valve and a biasing spring disposed in the through bore. A cap member screwed through onto the brass valve body and causing the ball valve to be seated on the sharp-edged valve seat and causing the ball valve to be positioned in close proximity to the other sharp edge. A plurality of radially vent holes formed in the brass valve body for venting fluid pressure to atmosphere when the ball valve becomes unseated from the sharp-edged valve seat. A lock nut for locking the cap member in position and a spring pin carried by the valve stem to permit the ball valve to be manually opened.

Abstract: A pressure-relief valve for the protection of hydraulic units in underground mining, functionable against a sudden overload in pressure, is provided including a valve housing having an upper part and a connection piece, a valve spring lodged against the upper part, a valve piston longitudinally slidable within the connection piece and engageable forceably at one end against the valve spring and having a blind bore and radial bores communicating perpendicular thereto through which a pressure medium is flowable, and at least one sealing ring against which the piston travels which is arranged in the connection piece. The sealing ring is positioned to adjoin the radial bores, consists of a very hard plastic material producing very low friction and has a rectangular cross section.

Abstract: A hydraulic pressure-control device, specially for powershift transmissions of motor vehicles, comprises a fluid pump (1) and a main valve for regulating the pressure in at least one high-pressure consumer device (6), which is attached to a pressure pipe (3) between the fluid pump (1) and the main pressure valve. The main pressure valve is designed as pressure-relief valve. In the main pressure valve is integrated the operation of a second pressure-relief valve. Two different pressure limits can be adjusted in the pressure pipe (3) by a valve piston (21) through two compression springs (17, 18) connected in parallel of which one compression spring (18) is bound.

Abstract: A pneumatic check valve includes valve connections having a common axis of symmetry and a valve body at least partially guided in a droplet-shaped member disposed between the two connections to substantially eliminate flow and restriction losses occurring during operation.

Abstract: The present valve, employable by persons affected by hydrocephalus, permits discharge into suitable offtake branches of the excess cephalorhachidian fluid existing in the ventricles of the brain. The valve basically consists of a hollow cylindrical body (1) having inside a seat (5) with an enlarging triangular shape designed to interact with an aptly-shaped capsule or small piston (6) and placed against an antagonist spring (7). This pattern permits to offset the varying amounts of ventricular fluid pressures, discharging outside any fluid, whether large or small, through suitable offtake branches and at the same time it accomplishes a self-cleaning function which ensures a constant flow efficiency.

Abstract: A pressure actuated valve is normally closed by the action of an externally manually adjustable spring that acts against the back side of the valve element. The valve element surface opposite that of the adjustment spring is exposed to a first port in the valve body, which first port is connected to a primary fluid flow line. At a location on the valve body there may be one or more side ports that communicate with the interior of the valve body in which pressure at side port/s will not affect the valve element. When flowing fluid back pressure is exposed to the valve element at the first port, said pressure overcomes the spring force and opens the valve element. Wherein it exposes a pressurized fluid/s to the valve interior through one or more side ports that will then establish a communication to the first port. Metered high pressure fluid/s then flow into the side port/s, forced through the valve and into the primary flowing fluid that created the initial back pressure to open the valve.

Abstract: This invention is an improved brake bleeder screw for use in the removal of entrapped gases from a vehicle's hydraulic wheel brake system. It is comprised of a discharge section containing external threads and an internal passageway, an extending device such as a compression spring, which is partially contained within an internal passageway of the discharge section and a sealing mechanism with an internal passageway, a head and an opening from the outside of the sealing mechanism to the internal passageway of the sealing mechanism. This improved brake bleeder screw can be substituted for existing hydraulic brake bleeder valves and permits the one-person bleeding of a hydraulic brake system.

Abstract: A filter head assembly includes a relief valve assembly therein, and is adapted for use in a spin-on filter or the like. When the relief valve assembly is in a closed mode of operation, fluid flow through the filter head, and an associated filter, results in conventional filtration. When the relief valve assembly is in open mode of operation, the filter is substantially bypassed permitting fluid to flow directly through the filter head, with filtration. The relief valve assembly includes a movable piston member therein, which opens and closes for the respective flow passage outwardly from a lateral takeoff port. Any substantial, undesirable, lateral forces acting upon a piston member may be substantially reduced by means of a lateral pressure release system provided according to the present invention. Generally, the lateral pressure-relief system comprises an annular recess formed in the piston member.

Abstract: A shut off and pressure regulator valve (10) for use with a metering valve (12) in a fuel system for a turbine engine. A pressure responsive piston (70) freely moves in a sleeve (48) to initiate fluid communication between an inlet port (16) and an outlet port (24). In response to a predetermined pressure differential a seal (90) carried by the piston (70) engages a ramp (56) to prevent fluid communication through the operational clearance (x) between the piston (70) and sleeve (48) to prevent fluid communication of a control fuel from a control chamber (76) to the outlet port (24) connected to the turbine engine.

Abstract: A shock absorber including a piston with two relatively movable elements defining a variable-sized, fluid-filled space. The size of the space is decreased when subjected to external fluid pressure and fluid flow through the piston is modified in response to such decrease.

Abstract: In an engine lubrication an external bypass mechanism for venting pressurized liquid around the lubricated areas, whereby the high side pressure is maintained within a desired range. The bypass mechanism includes a pressure regulator that has variable pressure setting.

Abstract: An improved apparatus for selectively deflating and inflating a tire mounted on a wheel comprises a valve assembly rigidly and coaxially mounted on a vehicular wheel incorporating a reciprocally movable valve body received in a cavity of a valve housing, the valve body having a plurality of channels for directing gas to gas outlet ports for pressurizing the tire, the valve body moving to a first position to close off a gas exhaust port in the valve housing and a second position to open the exhaust port when pressurized gas to the valve from a pressurized gas source is terminated. The valve assembly includes a valve member movably secured on the valve body alternately opening and closing the gas directing channels as the valve body is moved between the first and second positions. In a driver education system additional power steering and power brake failure assemblies are incorporated.

Abstract: A flow-metering valve assembly is provided for vehicle fuel tanks. The assembly includes a valve housing having an interior wall configured to define a chamber having an inlet and an exhaust outlet. The interior wall provides a first flow-metering surface situated in close proximity to the outlet. A spring-biased pressure-relief element is situated in the chamber and includes a valve member having an inner surface confronting the inlet and an upstanding skirt attached to the valve member. The skirt has a distal portion extending in an outward direction toward the outlet means to provide a second flow-metering surface. The first and second surfaces cooperate to define a variable flow-metering orifice therebetween.

Abstract: A pressure-control valve is connected to a working cylinder of an hydraulic, walking, mine roof support on one side of the piston in the cylinder. In its function as a pressure-limiting valve, it regulates the pressure in the working cylinder in dependence upon a predetermined pressure in a control conduit which is connected to the pressure chamber of a prop of the mine roof support. Through it a spring-loaded control piston of the pressure-control valve is hydraulically loaded so as to act on a spring-loaded valve closure member in the pressure-control valve. The control piston holds the valve-closure member in the closure position if the pressure in the control conduit exceeds the predetermined pressure. If the pressure in the control conduit drops off, the valve-closure member then regulates the pressure in the working cylinder to a comparatively low value.

Abstract: A flow-metering valve assembly is provided for vehicle fuel tanks. The assembly includes a valve housing having an interior wall configured to define a chamber having an inlet and an exhaust outlet. The interior wall provides a first flow-metering surface situated in close proximity to the outlet. A spring-biased pressure-relief element is situated in the chamber and includes a valve member having an inner surface confronting the inlet and an upstanding skirt attached to the valve member. The skirt has a distal portion extending in an outward direction toward the outlet means to provide a second flow-metering surface. The first and second surfaces cooperate to define a variable flow-metering orifice therebetween.

Abstract: For use in a system comprising a source of pressurized fluid and a plurality of lines extending to a plurality of gas springs, a gas spring comprising a cylindrical body with a bore, a piston rod positioned in the body and having an end projecting beyond one end of the body, a base closing the other end of the body, the cylindrical body and piston rod interengaging one another to limit relative outward movement of the piston rod with respect to the body. The gas spring includes a radial inlet through the wall of the cylindrical body into the base. A one-way valve is positioned in the base within the inlet and an axial inlet pressure passage extends from the outlet end of the valve to the interior of the cylinder. A radial bore is provided in the base and communicates at one end through an axial pressure relief passage to the interior of the cylinder.

Abstract: A checkvalve is provided for dispersing a fluid into a flowing stream. All operating parts of the checkvalve are located in the flowing stream to provide uniform and rapid dispersion of the fluid.