Abstract: A cylinder apparatus includes a flow path formed at a valve member through which a fluid flows when a rod is moved, a valve configured to open and close the flow path, and a restriction member disposed at a side in a direction in which the flow path of the valve is opened. The restriction member is an annular plate-shaped member in which an attachment hole is formed. The restriction member has a plurality of spring sections extending in the radial direction and configured to bias the valve toward the valve member and a stroke restriction section extending from between the neighboring spring sections in the radial direction and configured to restrict a stroke of the valve, which are installed at an outer circumferential side thereof. The stroke restriction section extends to form the same plane as the inner circumferential side of the restriction member.

Abstract: A pressure actuated valve for controlling the flow of fluid through a medical device, the valve comprises a housing including a lumen extending therethrough and a flow control membrane extending across the lumen to control the flow of fluid through the lumen. The membrane includes a plurality of slits extending therethrough so that, when the membrane is acted upon by a pressure of at least a threshold magnitude, the slits open to permit flow through the lumen and, when not acted upon by a pressure of at least the predetermined magnitude, the slits are maintained closed by a biasing force applied thereto by the membrane to prevent flow through the lumen. Each of the slits extends between end portions thereof along a curve wherein a distance between a first end portion of a first one of the slits and a first end portion of a second one of the slits is a minimum distance between the first and second slits.

Abstract: A hydraulic damper (2) comprises a tube (3) filled with working liquid, inside of which a slidable piston assembly (4) is attached to a piston rod (6) and provided with at least one valve assembly (43) to control the flow of working liquid passing through the piston assembly (4) during rebound and compression stroke of the damper. The valve assembly (4) contains a floating disc valve (431) and additionally comprises a unidirectional check valve disc (436) disposed serially with the floating disc valve (431) across the passage of the flow of working liquid during compression or rebound stroke of the damper (2). Preferably the piston assembly (4) forms a symmetrical cross-flow arrangement and preferably the at least one valve assembly includes compression (43a) and rebound (43b) valve assemblies of the piston assembly (4) which each have the same constructions.

Abstract: A valve-closing pressure chamber and a valve-opening pressure chamber are arranged on both sides of a main diaphragm inside an outlet shutoff valve. An upper supply/discharge tube and a lower supply/discharge tube are connected to a housing forming the outlet shutoff valve. The upper and lower supply/discharge tube supply and discharge air to and from the valve-closing pressure chamber and the valve-opening pressure chamber, respectively. An opening end, which is on the pressure chamber side, of each supply/discharge tube is obliquely cut relative to the direction of axis of the supply/discharge tube, which increases the opening area of the opening end. This prevents water present in the pressure chamber from adhering to the opening end of each supply/discharge tube and prevents the adhered water from freezing. As a result, operation performance of the outlet shutoff valve is enhanced.

Abstract: A device for ventilating and aerating a fuel tank includes a tank shut-off valve and two tank pressure control valves. One of the tank pressure control valves opens in response to an overpressure in the fuel tank and the other one of the tank pressure control valves closes in response to a negative pressure in the fuel tank. A valve unit which is formed from one or multiple of the valves is mountable vertically or horizontally and has a fuel connection which communicates with the fuel tank and a filter connection which communicates with an activated carbon filter. The two connections are generally oriented parallel and point downwards in vertical mounting position of the valve unit and in sideward direction(s) in horizontal mounting position of the valve unit and are arranged at or near the bottom side of the valve unit.

Abstract: A fuel vapor control valve comprising a housing. The housing comprising inlet and outlet ports in flow communication via first and second valve controlled passages. The first valve controlled passage being configured to admit fuel vapor flow in a direction from the inlet port to the outlet port only when pressure at the inlet port exceeds a predetermined threshold. The second valve controlled passage being configured to admit vapor flow in a direction from the outlet port to the inlet port only when pressure at the inlet port drops below pressure at the outlet port. The fuel vapor control valve further comprising a sealing arrangement disposed at an external portion of the housing between the inlet and outlet ports.

Abstract: A tank pressure control valve which provides for both controlled and passive vacuum relief functions with an additional component in a tank purge valve. The tank pressure control valve includes a second valve in addition to a purge valve to create a small sealing area on one side that opens easily against the tank pressure with the normal magnetic forces in a purge valve. The second valve is a sealing disk, which has an aperture to allow for the flow of purge vapor. One side of the disk has sealing on a larger area so the small vacuum forces open the valve against the spring force biasing the valve to a closed position. The design of the second valve uses a disk to provide precise flow control and passive vacuum relief.

Abstract: A driveline component breather system that utilizes a first and a second valve assembly to control the intake and exhaustion of fluid within the driveline component to regulate internal pressures is provided. When the pressure within the driveline component increases the first valve closes or remains closed and the second valve opens and fluid is exhausted to the atmosphere. When the pressure within the driveline component decreases, the first valve opens and the second valve closes and fluid flows into the driveline component from an interior portion of an associated vehicle.

Abstract: A valve for controlling the flow of fluid having first (16) and second (14) plates with offsetting apertures and a sidewall (12) disposed between the plates around the perimeter of the plates to form a cavity (15) in fluid communication with the apertures is disclosed. The valve further comprises a flap (17) disposed and moveable between the first and second plates and having apertures (22) substantially offset from the apertures (20) of one plate (16) and substantially aligned with the apertures (18) of the other plate (14). The flap is motivated between the two plates in response to a change in direction of the differential pressure of fluid across the valve.

Abstract: A slot valve (20) for use in the pneumatic switching circuit of a respirator, wherein said slot valve is designed to act bidirectionally and to pass over into the opened state to make possible the flow of a fluid at different pressure threshold values depending on the direction of flow of a fluid.

Abstract: A hydraulic power steering system which includes a tank and a power steering pump which takes in a pressure medium from an intake area which is decoupled from the prevailing atmospheric pressure on the side of the tank wall and delivers it under pressure to the power steering system. A valve device builds up a pre-pressure in the intake area and prevents a negative pressure and a positive pressure from building up on the interior of the oil tank.

Abstract: Disclosed is an explosion protection valve comprising a closing member (4) which is movable inside a housing (2), is guided along a guide bar (3), and can be displaced in a moving direction from a predefined open position into a sealing closed position in case of a shock wave or suction wave. The explosion protection valve further comprises a spring arrangement that is effectively connected to the closing member (4) in order to maintain the open position on the guide bar (3). Said spring arrangement is provided with a first spring element (5, 5?) and a second spring element (6, 6?) in relation to the respective moving direction. The spring elements are disposed such that the second spring element (6, 6?) can be impinged upon only following a predetermined spring travel (a) when the closing member (4) is displaced into the closed position.

Abstract: A cushion with a support pad comprising a plurality of compressible suspension elements with a cover top and bottom joined together to form an impervious barrier, and a valve in fluid communication with the plurality of compressible suspension elements that allows the controlled expulsion of air until a user positioned on the cushion is optimally immersed in the cushion. When the user is removed from the cushion, the valve allows ingress of air into the cushion. In one aspect, the valve comprises an expansion valve controls air flow out of and into the cushion. In one aspect, the valve comprises a labyrinth seal that dampens air flow and pressure spikes. The valve comprises a pressure responsive compression spring that controls the expulsion of air from the cushion and, consequently, adjusting the immersion depth of the seated user.

Abstract: The invention relates to an ink cartridge for an ink jet printer. The ink cartridge comprises a cartridge body and a detection mechanism for detecting the ink cartridge and residual quantity of ink, wherein the cartridge body comprises an ink tank for storing ink, an ink outlet for supplying ink to a printing head of the printer and an air inlet, the ink tank comprises a first ink chamber and a second ink chamber, a first negative pressure mechanism and a second negative pressure mechanism are arranged between the first ink chamber and the second cavity, the first negative pressure mechanism and the second negative pressure mechanism cooperatively control the ink inside the first ink chamber to be consumed preferentially than the ink inside the second ink chamber, and the second negative pressure mechanism generates negative pressure when a certain quantity of ink inside the ink tank is used for printing.

Abstract: A valve for limiting the tank pressure in a motor vehicle, comprising a first line (1) and a second line (2) which may establish a flow connection in which at least one body (3, 4) may be moved relative to another body (4, 3), whereby the movable body (3, 4) lifts up from a sealing seat (5), with regard to the object of adjusting the tank pressure using a compact design is characterized in that a first body (3), a second body (4), and the sealing seat (5) as a whole form a movable unit (6).

Abstract: A hydraulic manifold has features adapted to the needs of hybrid vehicle applications. In one embodiment, multifunction valves selectively regulate fluid flow among primary and auxiliary flow paths. A normally closed butterfly valve is biased by a relatively small secondary biasing force against rotation in first and second (opposite) directions, and by a relatively large principal biasing force against rotation in the first direction past a transitional angular position at which the principal biasing force takes effect. An actuator selectively controls the transitional angular position and the magnitude of the principal biasing force. In the first direction, flow must overcome only the secondary biasing force to pass the valve. In the second direction, any flow sufficient to overcome the secondary biasing force but not the principal biasing force will divide into a first flow passing the valve and a second flow induced to enter an auxiliary path upstream.

Abstract: A downhole tool pumping apparatus comprising a body and an active valve block. The body comprises a cavity housing a reciprocating piston defining first and second chambers within the cavity. The active valve block comprises a plurality of active valves, wherein the plurality of active valves includes a first active valve fluidly connected to the first chamber of the body, the plurality of active valves includes a second active valve fluidly connected to the second chamber of the body, and each of the plurality of active valves is configured to be actively actuated between open and closed positions.

Abstract: A mount structure for a two-way valve for a fuel tank of a small boat for improving mountability of the two-way valve while ensuring strength of the deck. The interior space of the boat, which is formed of a hull and a deck, is provided with an engine, a fuel tank, and a duct. One end of the duct is attached to the wall surface of the deck with a mount member. The two-way valve is connected to the breather hose of the fuel tank, and attached to the mount member at one end of the duct from the interior space of the boat. The mount member is integrally provided with a mount pipe for the tube which opens the two-way valve outside the deck.

Abstract: In accordance with the present invention, there is provided a bi-directional shut-off trim for a valve which possesses the functional attributes of a pilot operated trim and a balanced trim through the integration of a spring loaded check valve into a pilot trim. In forward flow isolation, the bi-directional shut-off trim of the present invention acts as a normal pilot operated trim. In reverse flow, the check valve of the shut-off trim opens to balance the pressure on either side of the plug thereof.

Abstract: Disclosed is a fuel conveying device including a valve housing in which a pressure release valve and a non-return valve are arranged parallel to one another, the pressure release valve having a first inlet, which downstream of a valve seat opens into a valve chamber in which a valve body is movably arranged and which is in fluid connection with a second inlet for the non-return valve via a first outlet. The device improves the control response of the pressure release valve by providing the first outlet at the periphery of the valve chamber and in the axial direction with respect to a valve axis such that when the pressure release valve is open the flow from the valve chamber into the second inlet is a substantially radial flow.

Abstract: The invention concerns a hydraulic valve arrangement (1) with at least two valve modules (2-6), each having a supply channel arrangement with a high-pressure channel (9) and a low-pressure channel (15), a working connection arrangement with at least one working connection (A, B), one directional valve arrangement (16) between the supply channel arrangement (9, 15) and the working connection arrangement (A, B) and a compensation arrangement (19), which is acted upon by a pressure in a load-sensing arrangement. It is endeavored to increase the number of control possibilities. For this purpose, the load-sensing arrangement of at least one valve module (2-6) has a pressure influencing arrangement (25-29) that differs from a pressure influencing arrangement (25-29) of a load sensing arrangement of another valve module (2-6).

Abstract: The invention relates to a system for performing parallel chemical experiments. The system comprises an array of parallel flow through reactors each comprising a reaction chamber, a reactor inlet and a reactor outlet connected to the reactor chamber. Downstream of each reactor a corresponding active pressure regulating arrangement is provided for actively regulating the reactor pressure. The pressure regulating arrangement comprises a passage for reactor effluent with an inlet connected to the reactor outlet and an outlet for discharging reactor effluent at a reduced pressure with respect to the reactor pressure.

Abstract: A vacuum relief valve includes: a housing with a central cavity, the housing having a system branch, a vacuum branch, a pilot branch, and an exhaust branch, each of the branches in fluid communication with the central cavity and having a respective port; a piston assembly comprising a first disk located in the pilot branch, a second disk located adjacent the exhaust branch, and a connecting member to which the first and second disks are mounted; and an actuator attached to a pilot seal, the actuator configured to move the pilot seal between a closed position, in which the pilot seal is positioned in and seals the pilot port, and an open position, in which the pilot seal is spaced from and does not seal the pilot port. When the pilot seal is in the closed position, the second disk is positioned on and seals the exhaust port, and when the pilot seal is in the open position, the second disk is spaced from and does not seal the exhaust port.

Abstract: A compressor apparatus (20) has a housing (22) having first (53) and second (58) ports along a flow path. One or more working elements (26; 28) cooperate with the housing (22) to define a compression path between suction (60) and discharge (62) locations along the flow path. An unloading valve (100) has a valve element (102) having a range between a first condition and a second condition, the second condition being unloaded relative to the first condition. Means (120, 160) bias the valve element toward a third condition intermediate the first and second conditions.

Abstract: A proportional pressure control valve includes a valve housing (38) with at least three fluid connections (1, 2, 3). The valve can be connected to a hydraulic drive system with a pre-determinable consumer pressure. The valve can perform reliable valve switching functions even for low-viscous fluid media, and can reduce its susceptibility to disturbance variables. A valve piston (56) actively connected to a pilot seat (5) by an energy accumulator (62) can be controlled by a control device (40). The consumer pressure on a fluid connection (1) acts on the valve piston (56) such that, according to the consumer pressure and the actuating force of the control device (40), a fluid can flow between the two other fluid connections (2 and 3) in both directions inside the valve housing (38).

Abstract: A vapor-compression air conditioning system comprising a blower positioned in a return air flow path from a conditioned space, a reheat heat exchanger positioned in the return air flow path and downstream from the blower, a system reversing valve fluidly coupled to the reheat heat exchanger, and a refrigerant flow sequencer interposed the system reversing valve and the reheat heat exchanger. A method of manufacturing an air conditioning system is also provided.

Abstract: There is disclosed a variable metering orifice arrangement for a current divider and current adding device, the metering orifice arrangement including one or more working terminals by each of which a consumer can be supplied with pressure fluid. The metering orifice arrangement includes a metering orifice piston to which control pressure tapped off between two throttles of a pressure divider can be applied, wherein at least one of the throttles is variable.

Abstract: A coupling assembly includes a female unit and a male unit which is removably connected with the female unit. A valve unit is located in the female unit and includes a core with two flexible disks on two ends thereof. A flange extends radially outward from a lower end of the core and is rested on a support frame in the female unit. The core extends through a through hole in a lower end of sleeve in the female unit. A plurality of paths are defined through the lower end of the sleeve so that by shifting the core to let either of two flexible disks to seal the paths in one direction, the direction of fluid flow can be controlled. The movement of the core is made by moving the sleeve.

Abstract: A sewer overflow relief device for mounting at a top end of a sewer overflow relief pipe includes a top cover having at least one outside air intake and an air flow control mechanism for controlling the flow of outside air into the sewer overflow relief pipe. In use, the device prevents outside water from entering the sewer and the device may be ejected from the sewer overflow relief pipe by sewage pressure pushing against the device, thereby allowing the sewer overflow relief pipe to overflow.

Abstract: A vascular access device having a spring-biased septum is provided for preventing the leakage of blood during the placement and use of vascular catheters and similar devices. The structure of the device includes a housing with an internal channel. A spring-biased septum is placed securely within the channel such that it substantially blocks blood flow through the channel. The spring-biased septum includes an elastic plug having a pre-slit or pre-molded hole and a biasing element disposed about the elastic plug. A needle or other object may be withdrawn through the slit or hole, after which the biasing element forces the hole closed, preventing blood leakage.

Abstract: A flow regulation vent for venting washout gas to atmosphere and for regulating flow from a pressurized gas supply includes a fixed portion adapted to engage a gas supply conduit; a spring force biased movable portion structured for flowing communication with the pressurized gas supply; and a hinge pivotally connecting the movable portion to the fixed portion. The fixed portion has a gas flow orifice and the movable portion is pivotally movable between 1) a relaxed position, wherein below a specified operating pressure, the movable portion is pivoted by the spring force to a position away from the fixed portion to establish a first gas washout flow area between the movable portion and the gas flow orifice, and 2) a fully pressurized position.

Abstract: A return fuel passage is configured to communicate an outlet of a low-pressure fuel pump with a back pressure side of a fuel injection device. The return fuel passage is configured to partially return fuel from the back pressure side to the fuel tank to control fuel pressure at the back pressure side in response to fuel injection. In a starting operation a backpressure control valve communicates the outlet of the low-pressure fuel pump with the back pressure side and blocks the fuel tank from both the outlet of the low-pressure fuel pump and the back pressure side. In a normal operation, the backpressure control valve communicates the back pressure side with the fuel tank and blocks the outlet of the low-pressure fuel pump from both the fuel tank and the back pressure side.

Abstract: A flow regulator (10) having a regulator housing (1) which is provided with a control device (8a) having a central body (3a) in a passage channel (2). An annular throttle body (4a) produced from an elastic material bounds the central body (3a) and defines a control gap (6a) between the throttle body (4a) and an adjacent peripheral surface (5a) that is provided with control recesses (7a) that are oriented in a flow direction (Pf1, Pf2). The passage cross-section of the control gap can be varied by the throttle body which is deformed by the pressure difference caused during throughflow. In the present flow regulator (10), there are two control devices (8a, 8b) arranged one behind the other the longitudinal direction of the passage channel (2), with the two control devices (8a, 8b) being configured for different throughputs and/or pressure ranges.

Abstract: A method for controlling fluid flow through a passageway includes slidably disposing a piston having a conduit that reduces the flow area through the passageway in the passageway and selectively closing the conduit of the piston by moving at least one of the piston and a plug.

Abstract: The present invention relates to an apparatus and method for improved check valve technology used in flow meters, particularly compound/combo meters. The improved check valve technology may comprise a single piece module that (1) can easily be removed from the check valve chamber without disturbing the metering module, (2) comprises a seal as part of the check valve assembly simplifying seal inspection, seal removal and seal replacement; (3) is secured in its housing only external fasteners; and (4) comprises fluid hammer suppression and monitoring features.

Abstract: A shock valve assembly for a hydraulic system includes a fluid path extending between a first port and a second port with a shock valve disposed in the fluid path to normally block fluid flow through the fluid path between the first and second ports. The shock valve temporarily opens to permit fluid flow between the first port and a second port through the fluid path when a fluid pressure differential between the ports exceeds a predetermined threshold. Fluid flow occurs in a first direction from the first port to the second port through the fluid path when the shock valve is temporarily opened and fluid pressure in the first port is greater than the second port. Fluid flow occurs in a second, reverse direction through the fluid path from the second port to the first port when the shock valve is temporarily opened and fluid pressure in the second port is greater than the first port.

Abstract: One advantageous embodiment of the invention is a filter device (10) for filtering a fluid and providing three or more substantially continuous directions of flow therethrough. The filter device (10) includes a housing (12) having an entry port (18) and an exit port (20). The housing (12) has a filter medium (22) disposed therein for filtering the fluid that flows along a filtration-flow direction (24a) from the entry port (18) to the exit port (20). The filter medium (22) has a bi-directional valve (28) coupled thereto for selectively directing the fluid along a bypass-flow direction (24b) and a reverse-flow direction (24c) that is generally opposite to said bypass-flow direction (24b). The bypass-flow direction (24b) extends from the entry port (18) to the exit port (20) in bypass of the filter medium (22). Also, the reverse-flow direction (24c) extends from the exit port (20) to the entry port (18).

Abstract: A valve for use in the control of pressurised air from a pressure tank, the pressure tank including a wall in which an outlet port is formed, the wall having an inner surface and an outer surface. The valve comprises a valve body of generally cylindrical configuration having an inner end which in use is located inside the pressure tank and an outer end which in use is located outside of the tank. A flow passage extends through the valve body, the flow passage having an inlet at or adjacent the inner end of the body and an outlet at or adjacent the outer end of the body. A valve seat surrounds the flow passage and a valve closure member is moveable towards and away from the valve seat to close and open the valve respectively. An operating means is provided for moving the valve closure member in order to operate the valve.

Abstract: An fuel volatilizing control system for a fuel tank, includes a fuel cover engaged to a fuel entrance of the fuel tank, a closure body arranged under the fuel cover and in the fuel entrance, a filter room containing filtering materials in the closure body and a double-lane valve comprising a first valve member and a second valve member. The first valve member and the second valve member can control whether the fuel gas flows to the environment or the outside air flows to the fuel tank.

Abstract: A fuel tank includes a canister and a fuel control valve arranged in an expanding room. The canister has two guiding pipes communicated respectively with an entrance of an engine and environment. The fuel control valve is communicated with the expanding room. A double-lane valve is arranged between the canister and the fuel control valve. The double-lane valve has an entrance communicated with the fuel control valve, an exit communicated with the canister, a first valve and a second valve arranged between the entrance and the exit. The second valve withstands a spring and is arranged on the first valve. The first valve can detect an expending press produced by volatilized fuel gas to control whether the fuel gas enter into the entrance of the engine. The second valve can detects a vacuum press of the fuel tank to control whether air enter into the fuel tank.

Abstract: The invention concerns a hydraulic valve arrangement (1) with at least two valve modules (2-6), each having a supply channel arrangement with a high-pressure channel (9) and a low-pressure channel (15), a working connection arrangement with at least one working connection (A, B), one directional valve arrangement (16) between the supply channel arrangement (9, 15) and the working connection arrangement (A, B) and a compensation arrangement (19), which is acted upon by a pressure in a load-sensing arrangement. It is endeavoured to increase the number of control possibilities. For this purpose, the load-sensing arrangement of at least one valve module (2-6) has a pressure influencing arrangement (25-29) that differs from a pressure influencing arrangement (25-29) of a load sensing arrangement of another valve module (2-6).

Abstract: A bi-directional valve having a housing with at least one internal gasket contact surface. A spring holds the plate, flapper and gasket against the internal gasket contact surface of the housing. When a predetermined pressure acts on the plate and flapper, the plate, flapper and gasket move away from the gasket contact surface to allow flow through the bi-directional valve in a first direction. To flow in the opposite direction the plate and gasket abut against the housing and the flapper opens to allow flow in an opposite direction. The same flow path is used for flow in either direction through the bi-directional valve.

Abstract: A hydraulic system includes a charge pump which supplies fluid to variable displacement main pump, a fluid reservoir and valve unit. The valve unit includes a hollow housing having a first end communicated with the reservoir and a second end communicated with the charge pump and the main pump. A housing valve land member is located between the first and second ends. A valve member is movably mounted in the housing. The valve member has a valve disk attached to first and second valve stems which project from opposite sides of the valve disk. The valve disk has a central position wherein the valve disk is received by the ring. The valve stems are slidably supported by stem support members at opposite ends of the housing. A hollow sleeve projects from an end of the valve unit. A spring is mounted in the sleeve and is engagable with an end of one of the valve stems and is biased to urge the valve member away from the sleeve.

Abstract: An apparatus for controlling flow in a flowline under pressure, said apparatus comprising a flow passage having a firs end and a second end, and hindering means for reducing the flow in the flow passage, the hindering means being arranged to move between a first and a second position under influence of a pressure difference between the first end and the second end of the flow passage. The reduction of the flow in the flow passage is larger when the hindering means is in the first and second position than when the hindering means is in an intermediate position between said first and second positions. Hereby an improved safety valve, which is adapted to shut off flow in a flow line in two directions, is provided.

Abstract: A safety shut-off device for sections of fluid circuits, which in case of damage or the like, have to shut off from each other on safety considerations. The safety shut-off device includes at least two valves connected to each other via a control chamber. A first pressure differential with the control chamber closes the valves and a second pressure differential, which is greater than the first, opens the valves.

Abstract: An aircraft comprises an overpressure valve, the overpressure valve comprising a sealing member which is moveable, in response to a first pressure differential across the valve, between a closed position and an open position. The overpressure valve further comprises a frangible portion, for example a carbon or sheet metal disc. The frangible portion is arranged to fail in response to a second pressure differential across the valve, the second pressure differential being more than the first pressure differential. Thus the valve is still able to relieve pressure when the sealing member is jammed (due to ice for example). It is therefore relatively safe. The valve may be in the surge tank of a fuel tank system.

Abstract: Disclosed is: (i) a fluid distributor and operational drive of a molding system, and/or (ii) of a molding system having a fluid distributor and operational drive, amongst other things.

Abstract: Disclosed is: (i) a fluid distributor and bidirectional drive apparatus of a molding system, and/or (ii) a molding system, amongst other things.

Abstract: A variable flow valve includes a housing, a valve element, an urging member, a first valve, a second valve, and a guide flow passage. The housing has an inlet opening, and an outlet opening. The first valve and second valve are formed between the valve element and the housing. The valve element has a separator wall. The separator wall separates the inlet opening and the outlet opening, and makes the second valve together with the housing. The guide flow passage is disposed on an inlet-opening side of the separator wall, and connects the inlet opening with the outlet opening when the separator wall moves to open the communication between the inlet opening and the outlet opening. The variable flow valve can make fluids flow without generating any turbulent flow, and can cope with the increment/decrement of required breather-gas flow volume more accurately.

Abstract: A flow control valve includes a body having a fluid passageway therethrough and first and second openings each adapted for receiving or discharging fluid from the passageway. A piston is slidably disposed in the passageway between the first and second openings of the body. The piston has a conduit portion that defines a bore therethrough for conducting fluid through a portion of the passageway. The bore has a reduced flow area. A plug is carried within the body and is equipped with one or more annular seals for sealably engaging the reduced flow area of piston bore so as to close the bore upon translatory movement of the piston, the plug, or a combination thereof. The flow control valve has particular application in downhole tools for communicating fluid into, out of, or through the downhole tool when disposed in a subsurface borehole.