Abstract: A valve device includes: a valve housing defining a cylindrical space connected to a high-pressure source, and having a first communication hole open at a valve seat located at a bottom portion of the valve housing and providing fluid communication between the cylindrical space and a low-pressure source; a seal member arranged in the cylindrical space and providing or shutting off fluid communication between the high-pressure and low-pressure sources so that the seal member moves away from or contacts the valve seat; and a stem having an accommodating recess at one end of the stem and moved axially. The seal member is fitted and held in the accommodating recess. The seal member has a second communication hole that provides fluid communication between a bottom face of the accommodating recess and the low-pressure source when the seal member is in contact with the valve seat.

Abstract: A puck retaining recess in a plunger of a solenoid valve is formed with a puck retaining lip that is fixed or unified with the plunger. The puck is then radially compressed to fit through a central opening of the retainer lip, and once the puck is pushed past the retainer lip, it is allowed to radially expand within the recess where the puck is retained between a bottom of the recess and the retainer lip. This eliminates many problems that previously occurred with separable retainer lips pressed into position to hold a puck after its insertion into a plunger recess.

Abstract: An air admittance vent diaphragm assembly is disclosed. The assembly comprises a base, an annular retainer ring, and an annular malleable washer. The base has an annular portion and a stem extending orthogonally from the center of the annular portion. The annular retainer ring includes a circumferential skirt engaged with an outer perimeter of the annular portion of the base, with the stem extending beyond the annular retainer ring. The annular malleable washer is disposed between the annular retainer ring and the annular portion of the base.

Abstract: A valve insert including a ring made of a resilient material. The ring has a shape that is defined by the rotation of an irregular polygon around a central axis. Superposing a quadrilateral and a circle forms the irregular polygon.

Abstract: A safety valve for a compressed gas reservoir has an exhaust duct that is connected to the compressed gas reservoir, and a sealing element, which is arranged to move within the exhaust duct, and selectively opens the exhaust duct to the outside depending on an operating phase. The exhaust duct has a greater cross-sectional area on the side facing away from the compressed gas reservoir than on the side facing the compressed reservoir, and a constriction on the side of the sealing element facing away from the compressed reservoir.

Abstract: A control device includes a valve body, a seat ring, and an actuator. The valve body defines a flow-path for a fluid. The seat ring is disposed within the flow-path. The actuator is coupled to the valve body and includes a control member. The control member is adapted for displacement relative to the seat ring for regulating a flow of the fluid through the flow-path. The control member includes a scaling disk adapted to sealingly engage the seat ring and close the flow-path. The seat ring includes an orifice disposed within the flow-path such that the seat ring prevents at least a portion of the flow of the fluid from substantially perpendicularly impacting the sealing disk.

Abstract: A seal arrangement for a fluid device includes a seal member that is disposed in a first groove formed in a body and one or more backup members disposed in a second groove formed in the body, with a shoulder between the first and second grooves against which the seal member is supported. The fluid device may be any device that contains a fluid, such as, for example, a valve, a regulator or a fluid connector. The body may be, for example, a stem-like member or other device that is disposed in a bore and for which a fluid-tight seal is needed to prevent fluid flow along the annulus between the stem and the bore wall. The shoulder may be used, for example, to provide a rigid support for the seal member under pressure, in one embodiment supporting about half of the bulk material of the seal member under pressure.

Abstract: A ball valve or any other type of valve in which sealing surface of the seat ring and surface of closure member keep relative sliding contact during opening and closing movement of the valves. One or more annular grooves cut into sealing surface of the seat ring around it's bore are filled with lubricant or grease used for lubricating the surfaces so as to avoid or mitigate their abrasive wear or galling caused by frictional heat.

Abstract: Disclosed is a valve sealant fitting of high quality, which not only ensures rapid and easy injection of a sealant but also maximizes an effect of preventing a leakage. That is, the present invention provides a valve sealant fitting, which comprises, sequentially assembles and couples: a sealant body 10 having an insert coupling groove 12 with a sealing O-ring 12a mounted on an inner wall of the body, a sealant exit port 13 with a small diameter and a sloped injection port at a lower end of the body, and an exit port side ball 14 mounted at a bottom of the exit port 13; an insert 20 having an intermediate sealant movement path 21 for guiding the sealant to be injected toward an inner center of the insert and having a sealed port 22 and a coil spring 23 interposed at a lower end of the insert; and an upper end cap 30 having a sealant injection port 31 with a small diameter mounted on an upper end of the insert 20 and having an injection port side ball 32 mounted below the injection port 31.

Abstract: A solenoid valve may include a housing, a solenoid coil, and a plunger. The solenoid coil may be disposed about an external portion of the housing and the plunger may be slidably disposed within the housing. The plunger may include a recess in a first end thereof having a seal assembly located therein and including a pin member inserted into the recess and an elastomeric sealing element molded around the pin member while inserted into the recess of the plunger.

Abstract: A shear valve assembly that includes a stator element having a body, a stator face and at least a first stator passage and a second stator passage extending through the stator body. The first passage and the second passage terminate at the stator face at a respective first stator port and a respective second stator port. The valve further includes a rotor element that defines a rotor face configured for fluid-tight contact against the stator face at a rotor/stator interface. The rotor face defines a first rotor port and a spaced second rotor port, and a rotor body thereof defines a first subterranean passage extending fully beneath the plane of the rotor face. One end of the subterranean passage terminates at the first rotor port at the rotor face surface, while an opposite end thereof terminates at the second rotor port at the rotor face. The rotor face and the stator face is rotatable about a rotation axis relative one another between a first position and a second position.

Abstract: A valve comprises a valve cartridge, a valve stem and a valve seal. The valve cartridge comprises a generally cylindrical cartridge body, a bore extending longitudinally through the cartridge body, and an outlet passage and intermittent inlet passages extending through a side wall of the cartridge body to intersect the bore. The valve stem comprises an elongate body configured to slide within the bore, and a neck and a seal channel circumscribing the elongate body. The valve seal is seated within the seal channel. The valve stem slides within the bore to move the seal channel past the inlet passages. Portions of the cartridge body between the inlet passages retain the valve seal within the valve channel until the inlet passages are open to the neck. In one embodiment, the inlet passages form a crenelated edge. In another embodiment, the inlet passages form a ported end.

Abstract: A valve assembly is disclosed. The valve assembly has a housing having a first recess disposed on an interior surface of the housing and at least one valve-supporting element disposed within the housing. The valve assembly also has a washer disposed within the housing, the washer having a first washer surface and a projection for transferring torque. The first washer surface abuts against a first valve-supporting element surface of the at least one valve-supporting element and the projection is received in the first recess. The valve assembly also has a first fastener disposed within the housing and having a first fastener surface abutting against a second washer surface of the washer.

Abstract: A gasket fits between a deck plate and a solenoid valve in a lifter oil manifold assembly. The valve has a planar end surface with valve ports. The gasket has gasket ports for alignment with the valve ports. The gasket further has a planar sealing surface. The planar sealing surface on the gasket surrounds the gasket ports, and abuts the end surface of the solenoid valve fully around the valve ports. The gasket preferably includes a rib structure that extends lengthwise to surround the array of gasket ports. The rib structure is deflectable to the plane of the sealing surface under a clamping force applied to the gasket by the deck plate and the end surface of the valve.

Abstract: A valve assembly has a valve housing, an inlet, an outlet and a flow passage extending between the inlet and the outlet. A shut-off valve is mounted on the housing adjacent the inlet and a flow control valve is mounted on the housing adjacent the outlet. By mounting both valves on the same housing, the dimensions of the assembly are reduced.

Abstract: An air admittance vent diaphragm assembly is disclosed. The assembly comprises a base, an annular retainer ring, and an annular malleable washer. The base has an annular portion and a stem extending orthogonally from the center of the annular portion. The annular retainer ring includes a circumferential skirt engaged with an outer perimeter of the annular portion of the base, with the stem extending beyond the annular retainer ring. The annular malleable washer is disposed between the annular retainer ring and the annular portion of the base.

Abstract: Apparatus to connect a stem to a valve member and, more particularly, apparatus to connect a threaded stem to a valve member of a control valve are disclosed. An example apparatus includes the threaded stem received in a threaded opening of the valve member and a plug received in an opening of the stem to expand diametrically the end of the stem to secure the threaded stem to the valve member.

Abstract: A thin disk portion, which extends radially, and a rib provided in an outer circumference part of the disk portion are formed in a valve body. A ring-like seal projection to be pressure-contacted with the disk portion to seal a valve is formed in a case. Because the disk portion is thin, deformation occurs along an end surface of a seal projection when the valve is sealed. Even when the seal projection is deformed due to fuel swelling or the like, sealing is enabled along the entire circumference thereof. High sealability is achieved even when the resin components are pressure-contacted with each other.

Abstract: The present invention is a method where a one-piece throttle valve is fastened to a throttle valve shaft in a first step. In another step, at least one elastic compensating element is placed onto the throttle valve. In another step, the elastic compensating element is pressed against the inner wall of the throttle valve housing by an expanding tool. In another step, the elastic compensating element pressed against the inner wall of the throttle valve housing is joined to the throttle valve.

Abstract: A combined valve-regulator apparatus, for safely regulating the flow of combustible gases such as oxygen. A compressible o-ring is used to provide controllable sealed seating of the valve and regulator during operation. A system is provided in the valve-regulator apparatus for venting the o-ring seat elements, to minimize undesirable ballooning or extrusion otherwise resulting from dynamic pressures and changing forces due to rapid gas flows through the regulator.

Abstract: A process control valve includes a valve stem, a valve plug. The valve stem and the valve plug are attached to one another by an arrangement that includes a locking pin that passes through substantially aligned bores in the valve stem and the valve plug. The locking pin is positively retained mechanically and prevented from extending outside of the bores in the valve stem and the valve plug.

Abstract: A backflow prevention valve includes a cylindrical case member with an inflow opening at one end and an outlet at the other end or a peripheral surface or both, and a valve member contacting a peripheral edge of the inflow opening for closing the inflow opening. An urging device urges the valve member toward the inflow opening, and a liquid inflow pipe is connected to the inflow opening from outside the case member. The liquid inflow pipe has a smooth inner surface without unevenness, and is attached to a fuel supply pipe inside the fuel tank. When the fuel is supplied, the valve member moves against an urging force of the urging device due to a fuel pressure, so that the inflow opening opens.

Abstract: The valve element is composed of a valve stem, at one of whose ends a valve head is arranged, said valve head being of concave design in the direction of the valve stem, having on the outside a continuous annular region and having at least two cutouts between the annular region and the central connection point for connecting to the valve stem which are closed off by at least one closure part.

Abstract: A probe activated valve system is disclosed that permits easier and safer testing of fluids in a pressurized system. The system has a shell having a valve passage. The valve passage has an end through which the valve passage is fluidly connected to a probe passage. A valve seat is provided at the end of the valve passage. A valve sealing member forms a face seal against the valve seat by compressing a retained sealing member, such as an O-ring. The valve sealing member is moveable from a closed position to an open position, upon insertion of a probe to engage and displace the valve sealing member along the valve passage, such that the valve sealing member is spaced from the valve seat and allows fluid in the valve passage to flow to the probe passage for collection by the probe.

Abstract: A sealing device for a modulating valve of the type having a valve body defining a flow passage, an inlet and outlets, a valve displaceable in the flow passage, and an actuator having an actuator rod rotatably coupled to the valve for displacing the valve in the flow passage. The sealing device comprises a body surrounding the actuator rod. A connector is adapted to secure the body of the sealing device to the valve body. Seals are provided between the body of the sealing device and the actuator rod arid between the body of the sealing device and the valve body, to prevent fluid flow therebetween. The body of the sealing device and the seals are adapted to conceal and contain fluid leaks, whereby no fluid is lost due to a leaking modulating valve.

Abstract: A flow quantity control valve includes second spring holder that is fixed within housing and holds one end of valve spring which is located on a side of valve disk. The second spring holder is a roughly cylindrical member made of a material with a lower thermal conductivity than that of the housing 1 made of cast iron; and is composed of roughly circular internal bottom, stay portion that is a body portion extending from the outer periphery of the internal bottom and surrounding the valve spring, a through hole formed in a center of the internal bottom and having a larger internal diameter than the external diameter of surrounding wall constituting another through hole of the housing and flange portion radially and outwardly extending from a upper part of the stay portion and having a roughly rectangular periphery portion.

Abstract: The invention relates to an air blast device comprising an air flow control device disposed between an inlet conduit and an outlet conduit. The control device comprises an evacuation valve (16) that controls the flow of the air contained in a rear chamber to the outlet conduit (5). The air contained in the rear chamber serves to hold a main valve (2A) in its seat (2B). This blast device is characterized in that a seat (17) of an evacuation valve is located at the level of a front face (2C) of the main valve (2). In order to evacuate air contained in the rear chamber, evacuation valve moves toward the front in the direction opposite that of the main valve (2A) as it leaves its seat (2B).

Abstract: A shut-off valve assembly for refrigerant liquid and/or gases including a valve body (1) having an inlet port, an outlet port and a flat annular valve seat, and a bonnet (2) fitted on the valve body (1). The bonnet (2) is provided with an axially shiftable externally threaded valve stem (3). A mechanism (20) to move the valve stem (3) is rigidly fixed on the valve stem (3). A valve disk (4) is provided with a circular collar. An annular groove is provided adjacent to the circular collar to house a resiliently compressible deformable circular ring (5). The circular ring (5) is placed in the annular groove on the valve disc between the valve disc and seat ring. The circular ring operates to effect a seal in the fluid flow path without requiring maximum compression of the sealing ring between the sealing ring and the valve disc.

Abstract: A valve plug design is disclosed that uses a plug head band and a retaining ring to restrain a valve plug head to a valve plug stem. This invention is specifically directed to providing valve plugs where the plug head material is different and distinct from the plug stem material and where each material is selected to optimize its performance. Moreover, this invention is provided with a means for fixing and removing the plug head to and from the plug stem that can easily be worked in the field without special purpose manufacturing equipment, thereby making the maintenance, repair and replacement of plug head easier for users. This valve plug design subjects the plug head to reduced stresses thereby enhances the operating life of the valve and valve plug. This valve plug design provides a shock absorbing, compliance barrier around and/or under the plug head.

Abstract: An improved seat ring, valve body, and seat ring valve assembly have self-aligning characteristics that reduce leakage without the need for an unacceptably high level of assembly torque. The seat ring includes at least one annular thrust bearing surface rim for receiving a valve plug to open and close the valve. The seat ring further includes threads positioned on its exterior surface for mating with threads in the valve body to provide a secondary seal of the seat ring. In order to prevent unacceptable leakage, a point of contact is provided to seat on an angled body contact surface of the valve to form a superior primary contact seal. The seat ring valve assembly reduces torque requirements, properly aligns the seat ring within the cavity, and reduces leakage.

Abstract: A retractable plug assembly for engaging a seat ring seating surface comprises a plug housing, a plug body, a retainer ring, a wear ring, a spring retainer and a valve spring. The plug housing has the plug body slidably disposed therewithin and defines a plug body seating surface. The wear ring is mounted to the retainer ring and extends downwardly therefrom to define a wear ring bottom face positioned downwardly relative to the plug body seating surface. The valve spring, captured between the spring retainer and the plug housing, biases the plug body away from the seat ring during engagement of the wear ring to the seat ring such that inwardly flowing fluid is prevented from directly impinging the plug body seating surface. The valve spring deforms during downward movement of the plug body such that the plug body seating surface engages the seat ring seating creating a fluid-tight seal.

Abstract: A stop valve which is fitted with a cylindrical supporting portion is comprised of a ring-shaped rigid axial portion, a ring-shaped platy bendable valve portion extending outward, and a sealing lip portion extending inward. The sealing lip portion has a first sealing lip which extends obliquely upward from the rigid axial portion and has a semi-circular seal effecting face provided at an edge thereof, and a second sealing lip which extends obliquely downward from the rigid axial portion and has a semi-circular seal effecting face provided at an edge thereof. The first and second sealing lips have an extending portion which connects the edge seal effecting face with the rigid axial portion and has substantially a same thickness as a diameter of the semi-circular shape.

Abstract: An improved rod connector assembly and method for mechanically fastening two rods together. Generally planar mating surfaces of a first rod assembly and a second rod assembly are compressively coupled by a rod union. The compressive load by the rod union is derived from a tapered surface that provides an interference fit to a corresponding tapered surface on the first rod assembly. Clearance diameters provided within the rod union accommodate axial misalignment of the first rod assembly and the second rod assembly. The second rod assembly includes an adjustable rod adapter to provide coupling to rods of various lengths. The first rod assembly includes an internal cavity to receive a portion of the second rod that may protrude from the adjustable rod adapter. Shaped mating surfaces of the rod adapters are received in a corresponding shaped cavity of the union to prevent rotation of the adapters.

Abstract: A ram packer for a hydraulic blowout preventer is provided that includes a steel reinforced hard elastomeric body which has a recess in the packer face for receiving a replaceable wear insert having shoulders on the insert surfaces that are relieved. By relieving the shoulders of the configuration where they come into contact with the ram packer, a projection is created to make contact with the ram packer while leaving an elastomer flow pathway for the reservoir elastomer of the ram packer. The wear insert has a multi-sided insertion surface which corresponds to the recess in the packer surface. This projection does not inhibit rotation of the wear insert, but is a spacer to hold a portion of the insert, particularly the shoulders, away from the back of the ram packer, where the shoulders can engage the back of the ram packer and inhibit the elastomer flow. The wear insert may be made of various materials according to the service in which used.

Abstract: A process control valve includes a valve stem, a valve plug. The valve stem and the valve plug are attached to one another by an arrangement that includes a locking pin that passes through substantially aligned bores in the valve stem and the valve plug. The locking pin is positively retained mechanically and prevented from extending outside of the bores in the valve stem and the valve plug.

Abstract: An annular sealing device having a positive stop to prevent over pressurization on the sealing device. The annular sealing device includes a substantially rigid support member having at least one substantially flat outer surface portion. There is a generally round cavity formed in the substantially rigid support member adjacent the at least one substantially flat outer surface. This generally round cavity has a first predetermined diameter and a predetermined depth. A generally round elastomeric sealing member having a predetermined thickness and a second predetermined diameter is disposed in the generally round cavity. Elastomeric sealing member has a substantially flat face engageable with a predetermined surface to be sealed. A stop means is engageable with at least a portion of the substantially flat outer surface portion of the substantially rigid support member for preventing undue penetration of the surface to be sealed into the generally round elastomeric sealing member.

Abstract: A valve body of an on-off valve that minimizes the deviation of opening and closing characteristics of a valve member made of an elastic polymer material and provided in a valve body of the on-off valve due to expansion caused by the fluid handled thereby and that maintains the specified opening and closing operation. A base portion of the valve member made with an elastic polymer material is inserted in an attachment hole of a valve element of a valve body with space constituted by a small-diameter-hole portion left at the hole bottom. A constricted-diameter portion formed in a tip opening of the attachment hole is embedded in the valve member to secure the base portion of the valve member. Axial elongation due to swelling of the valve member is distributed as forward elongation and rearward elongation sandwiching the site of securing by the constricted-diameter portion, which minimizes the axial elongation of a tip portion with a valve face and curtails deviation from the settings for on-off timing.

Abstract: In a valve member adapted to co-operate with an annular seat and comprising a plate with an annular channel for receiving a gasket which is crimped by folding in an outer wall of the channel, any risk of the gasket being ruptured is minimized by the outer surface of the gasket presenting, in the absence of any stress being exerted thereon, a first region extending frustoconically towards the central axis of the valve member, which first region is extended by a second region extending frustoconically away from the central axis, and by the outer wall of the channel being folded progressively towards the first region so as to fit snugly against the shape thereof without penetrating into the material of the gasket, without exerting any stress thereon, and without compressing it. The valve member is suitable for use in particular in thermostat valves.

Abstract: A valve stem and gasket apparatus and method includes a gasket that may be made of PEEK. A tool block set can be used to install the gasket over a flange on the stem.

Abstract: A valve fastening structure of a reciprocating compressor is provided. The valve fastening structure of the reciprocating compressor includes a piston, which is combined with a moving magnet of a driving motor and is in a linear reciprocating motion inside a cylinder and in which a refrigerant channel is formed in the direction of the reciprocating motion, a suction valve arranged in the leading end of the piston, the suction valve for opening and shutting the refrigerant channel of the piston, and magnets inserted into and fixed to the leading end of the piston, the magnets for fixing the suction valve by magnetic force. It is possible to minimize dead volume in the cylinder and to easily control the stroke of the piston by establishing the suction valve as the cardinal point during the controlling of the stroke of the piston. Accordingly, the efficiency of the compressor is improved.

Abstract: An adaptor is for a rising disc valve which has a handle for rotating a stem in a housing bore having a shoulder and which displaces a disc valve member which seals against a frusto-conical housing seat spaced from the shoulder. A stack of Belleville -steel springs is between the disc member and the ring seal. An interface ring is between the springs and the ring seal. As the disc member is seated in its valve seat, a ring at the attachment member abuts the shoulder. The attachment member can no longer axially displace and compressively loads the springs as the disc member is further axially displaced to the valve closed state. The compressive load on the ring seal expands the seal radially outwardly against the housing bore and radially inwardly against the piston shank.

Abstract: There is provided a two-port valve in which a deviation of a degree of parallelization of a valve member and a valve seat can be corrected automatically, which has excellent airtightness, and in which assembly and replacement of the valve member are easy.

Abstract: A control member for a piezo-valve having an elongated flexible element, which at one of its two axial ends has a respective sealing face on oppositely placed longitudinal side faces. The two sealing elements are a common component of a sealing body, which possesses a connecting section extending between the two sealing elements and formed integrally with same, such connecting section having an opening of the flexible element extending through it. The two sealing elements overlap the marginal section, delimiting the opening, of the flexible element and in the peripheral part of the opening engage the respectively associated longitudinal side face of the flexible element.

Abstract: A control member for a piezo-valve having an elongated flexible element, which at one of its two axial ends has a respective sealing face on oppositely placed longitudinal side faces. The two sealing elements are a common component of a sealing body, which possesses a connecting section extending between the two sealing elements and formed integrally with same, such connecting section having an opening of the flexible element extending through it. The two sealing elements overlap the marginal section, delimiting the opening, of the flexible element and in the peripheral part of the opening engage the respectively associated longitudinal side face of the flexible element.

Abstract: A valve comprises a valve body including a valve cavity with an inlet and an outlet. The valve body has a valve seat in the valve cavity. The valve seat has a flow passage disposed between the inlet and the outlet. A valve stem is movable in the valve cavity between an open position and a closed position. The valve stem includes a substantially rigid shaft and a resilient shell. The resilient shell is generally tubular, and is injection molded around a portion of the shaft. The resilient shell includes a sealing surface which is spaced from the valve seat with the valve stem in the open position and which is pressed against the valve seat to block the flow passage between the inlet and the outlet with the valve stem in the closed position. The resilient shell includes a spring cavity. A resilient spring hat has a spring seat. The resilient spring hat is disposed in the valve cavity with a press fit against an inner surface of the valve cavity to seal the valve cavity against leakage.

Abstract: A valve plug design is disclosed that uses a plug head band and a retaining ring to restrain a valve plug head to a valve plug stem. This invention is specifically directed to providing valve plugs where the plug head material is different and distinct from the plug stem material and where each material is selected to optimize its performance. Moreover, this invention is provided with a means for fixing and removing the plug head to and from the plug stem that can easily be worked in the field without special purpose manufacturing equipment, thereby making the maintenance, repair and replacement of plug head easier for users. This valve plug design subjects the plug head to reduced stresses thereby enhances the operating life of the valve and valve plug. This valve plug design provides a shock absorbing, compliance barrier around and/or under the plug head.

Abstract: A pressure regulator for a drinking system for birds or other animals that includes a housing and first and second engaging members for engaging the elongated supports for the fluid supply conduit of the drinking system. The first engaging member includes a pair of ends, each end including a plurality of flexible fingers extending generally parallel to the fluid supply conduit. The second engaging members are adapted to engage the flanges of the elongated supports. The pressure regulator includes a valve element and the housing desirably defines a valve bore for receiving the valve element. The valve element desirably includes a circular seal having a peripheral edge that extends radially inwardly and that includes a lip for sealing the valve bore when the valve element is in the closed position.

Abstract: A vacuum processing system may have a two-piece slit valve door, including a seal plate mounted on a mounting member, for closing the slit valve in a vacuum chamber. The seal plate, the piece that actually contacts the slit valve, may have a molded-in-place seal for making the contact and preventing metal-to-metal contact between the door and the valve. The seal may have a parabolic profile and be adhesively bonded within a groove in order to enhance its compressive and sealing capabilities. The seal plate may be removable for ease of service or replacement. Any particles generated by metal-to-metal contact between the seal plate and its mounting member may be captured by an O-ring statically sealed around the periphery between the two pieces.

Abstract: A valve gasket includes a main body portion formed of an elastomeric material having a high hardness durometer. The main body portion has recesses located on its opposite sides and at least one opening through the body connecting the recesses. The opposed recesses and the opening are filled with an elastomeric material having a hardness of a lesser durometer, softer than that of the main body portion. At least one of the filled recesses forms a sealing surface of the gasket. In a preferred embodiment both filled recesses form sealing surfaces, one to the seat and one to the stem. In one embodiment the gasket is generally ring-shaped in configuration and the opposed recesses are on opposite sides of the ring and each circumscribe the circumference of the ring.

Abstract: A bimorph piezoelectric flapper element is mounted at one end in a valve casing so that it extends into a valve chamber as a cantilever. The flapper element tapers to the unsupported end on which a fluorosilicone blocking plate is mounted. An outlet port is formed by a tubular boss which projects into the valve chamber and which tapers to a fine annular rim formed around a mouth of a bore at the tip of the boss. The blocking plate is normally held by the flapper element seated on the tip of the tubular boss to close the outlet port, the tip making an indentation in the fluorosilicone whereby to form a `bite` seal. The blocking plate is unseated by the application of a low voltage to the bimorph piezoelectric element. The valve is suitable for hydraulic fluids and may be operated by optical power.