Abstract: A relief valve device having a valve disc positioned above a nozzle, a disc holder surrounding an outer periphery of the valve disc, and a spring surrounding a valve stem. A bottom section of the nozzle is connected to a valve body and a top section of the nozzle is connected to the valve disc. An interior surface of the nozzle contains at least one groove having a circular cross-sectional profile. The relief valve device prevents flow through the nozzle when a pressure at an inlet of the nozzle is below a predetermined force of the spring. When the pressure exceeds the predetermined force of the spring the valve stem is moved linearly through the longitudinal axis of the spring to displace the valve disc from sitting atop the nozzle and permit flow through the nozzle.

Abstract: Provided are a piston valve core structure with a combination of a rigid ring surface and a flexible base surface, and a method thereof. The structure includes a piston valve core, a flexible base surface, a rigid ring surface and a connecting member; a bottom surface of the piston valve core is planar; a top surface of the flexible base surface fits to the piston valve core, and a bottom surface thereof is a ellipsoidal convex surface; the rigid ring surface is a ring body with a stepped cross-section, and is coaxially arranged under the flexible base surface; a protruding height of the flexible base surface is greater than that of the rigid ring surface; the connecting member is configured to connect respective structures. The piston valve core structure can overcome unbalanced moment on the valve core, has a simple structure, and can be widely promoted and applied.

Abstract: A regulator performing fluid control includes an annular protruding portion having a valve seat on its leading end and an annular diameter-decreasing surface formed by decreasing an inner diameter of the annular protruding portion toward a valve hole. The regulator includes a valve element provided with a contact surface to be in contact with the valve seat and a columnar step portion provided on an inner peripheral side of the valve seat protruding from the contact surface toward the valve hole, the step portion having a diameter larger than an inner diameter of the valve hole and being coaxially formed with the valve hole. An annular ridge is formed by an outer peripheral surface of the step portion intersecting an end face of the step portion on the valve-hole side with the annular diameter-decreasing surface to constitute a passage narrowing portion.

Abstract: A valve head assembly for a hydraulic fracturing pump. The valve head assembly includes a valve body attached to a valve leg assembly with backward swept or delta shaped legs. Each leg is attached to a main leg shaft which extends along a main axis. Each leg has a first leg segment and a second leg segment. The first leg segment has a first end that attaches to a distal end of the main leg shaft and extends along a first leg segment axis back towards the valve body. The second end of the first leg segment attaches to the second leg segment which extends along a second leg segment axis that is substantially parallel with but spaced apart from the main axis. The first leg segment may form an angle between the main axis and the first leg segment axis that is between approximately 10 and 60 degrees.

Abstract: A closed-loop control valve module for closed-loop controlling a fluid flow is described, which comprises an electrical valve actuator motor, wherein a valve spindle comprising a frustoconical sealing section is displaceable by means of the valve actuator motor along a valve spindle axis and the frustoconical sealing section, depending on the position of the valve spindle, releases or separates off a flow channel connecting a fluid inlet and a fluid outlet. A pressure compensation channel is provided which, at least in the closed state of the closed-loop control valve module, connects an end of the valve spindle opposite the valve actuator motor to a pressure compensation area or the fluid inlet in terms of flow.

Abstract: A fluid end having as fluid flow bores sealed without threading a retaining nut into the walls of each bore. The fluid ends may be assembled using a plurality of different kits, each kit comprising a fluid end body, a component, a retainer element, and a fastening system. The retainer element holds the component within each of the bores formed in the fluid end body and the fastening system secures the retainer element to the body. The fastening system comprises a plurality of externally threaded studs, washers and nuts in some embodiments. In other embodiments, the fastening system comprises a plurality of screws.

Abstract: A valve armature for a solenoid valve has a basic body consisting of a magnetically conductive metal. On one end of the basic body is arranged a depression which receives a tappet having a closing element. A tappet basic body consists of plastic and forms an interference fit with the basic body. A valve cartridge for a solenoid valve has such a valve armature, in which case, the basic body has an annular groove which is connected to the depression. The annular groove receives plastic deformations of the tappet basic body which form a form fit with the annular groove and fix the tappet basic body in the depression.

Abstract: A novel valve that may include a self-energizing seal member with a lobe extending toward a valve seat surface, a radially outwardly extending skirt, an axially extending nose, solenoid-operated three-position valve member, a pressure sense port, and/or a pressure pick-up opening. The features of the valve may allow the valve to operate at higher flow rates while requiring less energy to operate, may have a wider pressure and/or temperature operation range, may allow bidirectional fluid flow, may be less expensive to manufacture, and/or may enable a simple and compact assembly of the valve with a pressure sensor. The self-energizing seal member may include a base portion and the lobe extending may extend at an angle from the base portion relative to a longitudinal axis. The lobe may reduce energy requirements to operate the valve compared to larger sealing contact area seals. For example, the lobe may have a small sealing area to allow the valve to be better balanced.

Abstract: A valve seat assembly comprises a valve. The assembly further comprises a removable upper seat associated with the valve. The assembly further comprises a lower seat configured to be inserted into a fluid end of a pump and releasably couplable to the upper seat. The upper seat is decouplable from the lower seat while the lower seat remains inserted in the fluid end of the pump. The valve is configured to contact the upper seat to prevent a flow of fluid through the fluid end of the pump.

Abstract: A screw, in particular for housings, has an elongated section provided at least in parts with a thread, and a screw head. A cone-shape section may be arranged between the screw head and the elongated section, wherein the point of the conical section connects to one end of the elongated section, and the underside of the screw head may be arranged opposite the base surface of the conical section, and a groove for accommodating a seal may be provided between the underside of the screw head and the base surface of the conical section.

Abstract: The high pressure valve (1) has a high pressure region (2) and a low pressure region (3) and a shut-off element (4). The shut-off element (4) is designed for closing and opening a fluid connection between the high pressure region (2) and the low pressure region (3) and to this end it can be moved in an axial direction (Z) between a closed closure position and an opened opening position. A seat gasket (9) is provided to form a seal in the closure position. The seat gasket (9) is a compression sealing seat gasket (9) which is affixed to the shut-off element (4) and is arranged in a recess provided in the shut-off element (4).

Abstract: Disclosed herein is an air shut-off valve for a fuel cell system that can completely close an air passage (11) communicating with a cathode of a fuel cell stack, even though a butterfly-type valve is employed, upon the halt of operation of the fuel cell system, thereby greatly improving the durability of the fuel cell stack.

Abstract: A fuel supply apparatus includes a valve seat, a valve element, and a sealing member formed of a circular-disc or annular shape placed in the valve element to face the valve seat. The valve element includes an outside facing surface corresponding to a surface facing the valve seat and formed more outside than the sealing member in a radial direction thereof. The sealing member includes an annular protrusion protruding toward the valve seat more than the outside facing surface, and a flat portion formed between the outside facing surface and an distal end of the protrusion on a side toward the valve seat in a central axis direction of the sealing member so that the flat portion will contact with the valve seat during valve closing.

Abstract: A gate valve that can suppress the deterioration of a seal member due to radicals is provided, and the seal member in the gate valve can be prevented from coming off a dovetail groove. A seal groove for attaching a seal member is formed by a first groove portion that has a rectangular cross-section and a second groove portion that is provided in the bottom wall of the first groove portion and that has a dovetail groove-like cross-section. The seal member is held in the second groove portion with part thereof protruded into the first groove portion. A valve seat that is inserted into and pulled out of the seal groove to be brought into and out of contact with the seal member is protruded from the inner surface of a partition wall in which a gate opening is provided.

Abstract: A pressure reducer includes a housing with an axially displaceable biased control body in order to close a connection between an inlet and an expansion chamber, where the housing is equipped with an axially displaceable biased actuating piston in order to displace the control body against the spring load of the control body as a function of the pressure in the expansion chamber and to open the connection, the housing being made of plastic, and the pressure reducer includes a separately made insert, where the insert is fixed between the inlet and the expansion chamber in the plastic housing and said insert has a guide bore, which is connected to the inlet and supports the control body, and a connecting bore, which adjoins the guide bore and which opens into the expansion chamber, where the insert forms an annular shoulder surface between the connecting bore and the guide bore, said shoulder surface interacting as a seating surface with the seal on the control body.

Abstract: A fluid flow connector and a method of manufacturing the same wherein the fluid flow connector utilizes a valve having a plunger which is made by overmolding a soft exterior to a hard core. The soft exterior being overmolded to the hard core by either insert or multi-shot methods. The method also including attaching the soft exterior to the hard core mechanically and/or by molecular bonding.

Abstract: A valve plug comprising a cylindrical body having an annular flange with a top surface, a bottom surface, and a circumference is disclosed. The valve plug further comprises an annular recess disposed in the bottom surface of the flange, and a plurality of holes disposed in the top surface of the flange. Each hole extends into the recess to create a plurality of channels extending between the bottom and top surfaces of the flange. Each channel of the plurality of channels includes a stepped portion. A polyurethane sealing member is disposed within each channel and includes: a top portion forming a continuous bond on the top surface and along the circumference of the flange; a central portion forming a horizontal bond on each stepped portion; and a bottom portion forming a sealing surface adapted to sealingly engage a seating surface of the seat.

Abstract: A sealing disk mounting assembly for a regulator includes a mounting member adapted to be operatively attached to a tubular member of a control member assembly of a regulator, a disk holder operatively attached to the mounting member, and an annular sealing disk disposed in an annular channel that is formed between the mounting member and the disk holder. The annular sealing disk is mechanically retained between the mounting member and the disk holder by compressive forces.

Abstract: A diaphragm (20) for a diaphragm valve is described. The diaphragm (20) has a body (22) comprising a first elastomer and a resistant layer (24) comprising a second elastomer having a different composition or formulation. Diaphragms described in examples have good flexibility with a high level of chemical resistance and low surface adhesion. A fixing attachment for fixing the diaphragm in the valve is also described.

Abstract: Apparatus, methods and systems are provided for sealing the door of a slit valve. In one embodiment, the apparatus includes a seal, adapted to extend along a perimeter of a slit valve door; and a hard stop, disposed between the seal and an outer edge of the slit valve door, and adapted to extend along the length of the seal, wherein the hard stop and elastomer seal fill at least a portion of a gap between the slit valve door and an insert leading to a process chamber.

Abstract: A valve element has a packing material, whose one side surface touches and leaves a valve seat as a sealing surface, and a support member, which is driven in opening and closing directions of a valve section by actuating an actuator. The support member includes a supporting surface, which is in contact with a side surface of the packing material opposite to the sealing surface of the packing material, and an engagement part, which supports a peripheral edge part of the packing material in a manner such that the engagement part is engaged with the peripheral edge part. A ring-shaped fluid flow passage is formed between the supporting surface of the support member and the packing material, and this fluid flow passage communicates with an upstream passage.

Abstract: A closure component for solids-handling equipment includes a closure body configured to close a solids flow path by displacement of the closure body along a stroke axis and a removable metallic sealing element attached to the closure body. The metallic sealing element is configured sealingly to engage an endless metallic seat spaced radially outwardly from the stroke axis when the closure body closes the solids flow path. The closure body includes or defines at least one locating formation to engage and locate the metallic sealing element.

Abstract: In accordance with various embodiments, a plug head assembly is provided comprising a ceramic plug head having a frustroconical geometry, wherein the ceramic plug head has a proximal terminus and a distal terminus, wherein the ceramic plug head has a first coefficient of thermal expansion (CTE), a sleeve having a frustroconical geometry conforming to the ceramic plug head and a second CTE, wherein the second CTE is greater than the first CTE, a distal retainer having a frustroconical geometry conforming to the sleeve, the distal retainer having a first engagement portion for engaging the a proximal retainer, the proximal retainer having a second engagement portion for engaging the distal retainer, and a base that couples with the proximal retainer. In addition, thick banded plug heads are provided.

Abstract: The present invention relates to a control valve for a fuel injector. The control valve has a control valve body which defines a supply passage for high pressure fuel. A control chamber and a pressure compensating chamber are provided in the control valve. The control chamber and the pressure compensating chamber are both in fluid communication with the supply passage. A control valve member is provided for controlling fuel pressure in the control chamber. The pressure compensating chamber is spaced radially outwardly from the control chamber. The invention also relates to a control valve member having a pressure compensating cavity.

Abstract: The invention relates to the simple and safe construction of a high-pressure connection (1) for transferring gaseous and/or liquid media, in particular for the refuelling of vehicles with hydrogen. According to the invention, the high-pressure connection (1) comprises a housing (2) with a media passage (P) and a leaktight piston (3) of which the front end is disposed in a sealing manner with respect to an annular seal. The seal (4) has a seal support (4a) in which is inserted a sealing insert (4b), the sealing support (4a) consisting of a harder plastics and the sealing insert (4b) consisting of a softer plastics.

Abstract: Valve seat apparatus having positive retention for use with fluid control devices are described herein. An example valve seat apparatus includes a metallic ring and an elastomeric ring coupled to the metallic ring and having a sealing surface to sealingly engage a flow control member of the fluid control device. At least a portion of an outer surface of the elastomeric ring includes an annular lip to sealingly engage an annular recess of a body of the fluid control device.

Abstract: A multi-seal knife gate valve includes: a valve body coupled to a pipe; a disk inserted into the valve body to move vertically; and a valve seat pressed against the disk so as to maintain a tight seal, wherein the disk installed in the valve body moves vertically to open or close a passage through which fluid flows, and the valve seat is pressed against the disk and includes at least one metal seat and one rubber seat to maintain a seal.

Abstract: A sliding stem control valve includes a valve body, a seat ring located within the valve body and a valve plug slidably mounted within the valve body, the valve plug and the valve seat cooperating to control fluid flow through the control valve. A seal assembly is located between the valve plug and the valve seat, the seal assembly including a metal/graphite seal ring located between a first backup ring and a second backup ring. A biasing element is located adjacent the second backup ring and a retainer ring is located adjacent the biasing element to maintain the biasing element adjacent the second backup ring.

Abstract: A three-way poppet valve that can restrict or eliminate backflow without the use of an external check valve. Unlike conventional three-way poppet valves wherein both inlets can be open to the outlet at the same time during movement of the poppet, the valve according to the present invention can be configured to close both inlets prior to opening one of the inlets to the outlet. The valve features a poppet valve assembly that is operable to prevent both inlets from being open to the outlet at the same time. The valve assembly also reduces the force needed to close the valve against at least one of the inlets thereby allowing the use of a smaller actuator. A unique seal including a valve seat that is configured to conform to a valve member under sufficient pressure.

Abstract: A seat block capable of maintaining a well-fitted state of a seat portion in a simple and reliable manner regardless of use conditions. A seat portion base body (43) is provided in a housing (67) provided with a valve passage (66) and allows a piston (28) for opening and closing a valve passage (66) to be pressed on the seat portion base body (43). A spring member (23) applies an elastic force to the seat portion base body (43) such that the elastic mechanism (23) cooperates with the housing (67) to retain the seat portion base body (43).

Abstract: A multi-piece valve disk of a sliding and/or seat valve, a ring seal with an elastic sealing ring with an external sealing zone is placed in a ring groove of the valve disk onto a dimensionally stable backup ring, and where an elastic restoring region effectively positioned between the backup ring and the external sealing zone is arranged in the backup ring, the restoring region being embodied in one piece with the sealing ring of its material adjacent to the external sealing zone of the sealing ring.

Abstract: Tunable fluid end embodiments comprise a family, each family member comprising a pump housing with at least one installed tunable component chosen from: tunable valve assemblies, tunable valve seats, tunable radial arrays and/or tunable plunger seals. For example, a tunable valve assembly or tunable radial array selectively attenuates valve-generated vibration at its source, thus reducing the likelihood of fluid end failures associated with fatigue cracking and/or corrosion fatigue. Adding tunable valve seats and/or tunable plunger seals to a fluid end facilitates optimal damping and/or selective attenuation of vibration at one or more predetermined (and frequently localized) fluid end resonant frequencies. Thus, the likelihood of exciting destructive resonances in a pump's fluid end housing is further reduced.

Abstract: Tunable fluid end embodiments comprise a family, each family member comprising a pump housing with at least one installed tunable component chosen from: tunable valve assemblies, tunable valve seats, tunable radial arrays and/or tunable plunger seals. For example, a tunable valve assembly or tunable radial array selectively attenuates valve-generated vibration at its source, thus reducing the likelihood of fluid end failures associated with fatigue cracking and/or corrosion fatigue. Adding tunable valve seats and/or tunable plunger seals to a fluid end facilitates optimal damping and/or selective attenuation of vibration at one or more predetermined (and frequently localized) fluid end resonant frequencies. Thus, the likelihood of exciting destructive resonances in a pump's fluid end housing is further reduced.

Abstract: A closure component for solids-handling equipment includes a closure body configured to close a solids flow path by displacement of the closure body along a stroke axis and a removable metallic sealing element attached to the closure body. The metallic sealing element is configured sealingly to engage an endless metallic seat spaced radially outwardly from the stroke axis when the closure body closes the solids flow path. The closure body includes or defines at least one locating formation to engage and locate the metallic sealing element.

Abstract: A double seat valve having a seat for cooperation with two valve disks which are linearly adjustable relative to each other and together relative with respect to the seat, for a seat valve function and a sliding valve function, each of the valve disks containing a ring seal with an elastic sealing ring in a ring groove, both sealing rings being manufactured with the same shapes and dimensions, each sealing ring being positioned in the ring groove with a backup ring, and both sealing rings being arranged in rotational positions differing with respect to the respective sealing function relative to the direction of adjustment of the valve disks.

Abstract: A gas lift valve that has a longitudinally extending tubular body having an inlet and an outlet, a flow path extending between the inlet and the outlet, and a flow tube located inside the body. The flow tube is translatable in the axial direction between at least a first and a second position. A venturi orifice located inside the body along the flow path. A seal part is located proximate to the outlet of the body. A flapper is connected with the body by way of a hinge part and the flapper has at least a first open position and a second closed position. The closed position is where the flapper contacts the seal thereby closing the flowpath and the second closed position is where the flapper does not contact the seal and does not close the flowpath.

Abstract: Tunable fluid end embodiments comprise a family, each family member comprising a pump housing with at least one installed tunable component chosen from: tunable valve assemblies, tunable valve seats, tunable radial arrays and/or tunable plunger seals. For example, a tunable valve assembly or tunable radial array selectively attenuates valve-generated vibration at its source, thus reducing the likelihood of fluid end failures associated with fatigue cracking and/or corrosion fatigue. Adding tunable valve seats and/or tunable plunger seals to a fluid end facilitates optimal damping and/or selective attenuation of vibration at one or more predetermined (and frequently localized) fluid end resonant frequencies. Thus, the likelihood of exciting destructive resonances in a pump's fluid end housing is further reduced.

Abstract: The present invention concerns a sealing system particularly for industrial safety valves, even more particularly for industrial gate valves. Hence, the subject of the present invention is both a sealing system (1) suited to be used on a gate valve and a gate valve comprising such a sealing system (1). The system according to the present invention allows to combine the advantages in terms of simplicity and cost-effectiveness for manufacturing gate valves provided with a traditional sealing system, with further advantages in terms of performance both at high and at low operating pressures and reducing the torques required to handle the slab, also ensuring the operation of the valve itself with unaltered sealing performance over time, even under particular and demanding operating conditions.

Abstract: Tunable fluid end embodiments comprise a family, each family member comprising a pump housing with at least one installed tunable component chosen from: tunable valve assemblies, tunable valve seats, tunable radial arrays and/or tunable plunger seals. For example, a tunable valve assembly or tunable radial array selectively attenuates valve-generated vibration at its source, thus reducing the likelihood of fluid end failures associated with fatigue cracking and/or corrosion fatigue. Adding tunable valve seats and/or tunable plunger seals to a fluid end facilitates optimal damping and/or selective attenuation of vibration at one or more predetermined (and frequently localized) fluid end resonant frequencies. Thus, the likelihood of exciting destructive resonances in a pump's fluid end housing is further reduced.

Abstract: A universal control valve may use two different seat ring types including a threaded seat ring or a clamped seat ring. The valve includes a valve body, a cage mounting space enclosed by a bonnet and sized to receive two different valve cage types, and a seat ring mounting location including, an annular shoulder, a radiused projection, and a threaded portion. The threaded portion receives a threaded seat ring and the radiused projection forms a seal, while the shoulder supports a mounting flange of a clamped seat ring and forms a seal. Accordingly, the seat ring mounting location can receive a selected one of the two different seat ring types.

Abstract: A gate valve apparatus is disclosed. The gate valve apparatus is provided with a valve casing that includes a first valve seat and a second valve seat, and in which an opening portion is formed; and a closure element that includes a sealing member that contacts the first valve seat to seal the opening portion. In addition, the gate valve apparatus is provided with a shutoff member that contacts the second valve seat to thereby be deformed, so that a space between the opening portion and a sealing member is shut off by the shutoff member when the closure element closes the opening portion. The shutoff member is deformed and continues to contact the second valve seat under normal and high temperature environments when the closure element closes the opening portion.

Abstract: Apparatus for controlling a pressurized fluid. In accordance with some embodiments, a valve assembly includes a piston moved between closed and open positions. A sealing member is disposed within an annular recess of the piston and characterized as an endless annular ring extending about a central axis of the piston. The sealing member has an elongated circle cross-sectional shape when the sealing member is in an uncompressed state prior to installation in said recess. The cross-sectional shape is defined by parallel top and bottom surfaces having a length L in a direction perpendicular to and intersecting the central axis, and having opposing inner and outer surfaces of a radius R, the inner and outer surfaces respectively facing toward and facing away from the central axis, and wherein the dimensional value of L is at least five times greater than the dimensional value of R.

Abstract: A valve including an elastically deformable component is disclosed, wherein the elastically deformable component is disposed in one of a valve head and a valve body, and wherein the elastically deformable component is elastically deformed when the valve is in a closed position to facilitate a substantially fluid tight seal between the valve head and the valve body.

Abstract: Redundant metal-to-metal seals for use with internal valves are described. A plug having redundant sealing functionality for use with a poppet of an internal valve includes a tapered surface to sealingly engage a seat of the poppet. Additionally, the plug includes a seal adjacent the tapered surface and disposed in a groove defined by the plug to sealingly engage the seat.

Abstract: Provided are a diaphragm, a diaphragm valve, and a method of manufacturing a diaphragm capable of increasing a flow rate (Cv value) of gas without degrading long-term durability even when a displacement amount is increased. A diaphragm (1) has an outer diameter ? of 10 to 35 mm and includes a dome portion (1D) in a dome shape and a flange portion (1T) formed continuously at a peripheral edge of the dome portion (1D) via a boundary portion (1K), the boundary portion (1K) has a radius of curvature R of 0.6 mm or more on a convex side of the dome portion (1D), and the diaphragm is formed of a cobalt-based super-alloy.

Abstract: A tunable valve assembly attenuates valve-generated vibration at one or more predetermined assembly resonant frequencies. The assembly comprises a valve body having a peripheral groove spaced radially apart from a central reservoir. An adjustable preload flange is centrally coupled to the valve body for changing assembly compliance and for imposing a shear preload by partially constraining a viscoelastic element in the reservoir. Assembly resonant frequencies are thus predictably altered. Further, the vibration spectrum is narrowed and its amplitude reduced through hysteresis loss of closing impulse energy at each such altered resonant frequency. At least a first predetermined assembly resonant frequency is achieved through adjustment of shear preload, and at least a second predetermined assembly resonant frequency is achieved through choice of a viscoelastic or composite element in the peripheral groove.

Abstract: A valve seat assembly for a pressure relief valve in which a valve member is biased against a valve seat to a closed position and movable away from the valve seat to an open position when inlet fluid pressure reaches a predetermined threshold value, the valve seat assembly having a seat body with an internal bore and positioned to abut the valve member when moved by the spring to the closed position. An insert member is disposed in the seat body to extend between an upper end of the seat body and a resilient member supported by the seat body for resiliently pressing against the insert member, the upper end of the insert member supporting the valve seat to seal with the valve member.

Abstract: A slide valve for blocking a line conveying media includes a housing having a passage opening and a slider plate moveable within the housing at right angles to the passage opening. The slider plate can be displaced from an open position into a closed position blocking the passage opening tightly by a drive mechanism. A lateral seal is disposed in a respective groove in the housing above the passage opening on both sides of the slider plate at right angles to its direction of displacement. The inside and outside of the housing and the slider plate are provided with at least one layer forming a temperature barrier, and the lateral seal includes a high temperature-resistant layer or sealing compound. The risk of a leak into the atmosphere and/or in the passage during a fire or during extinguishing efforts is thus substantially reduced.

Abstract: A slide valve for blocking a line conveying media includes a multi-part housing having a passage opening and in which a slider plate operable by a drive component is moved longitudinally. To both sides of the slider plate, laterally to its direction of movement, a respective longitudinal seal is disposed above the passage opening in a longitudinal groove in the housing. Each longitudinal seal has an elastic sealing profile and bars adjacent to the latter. Each elastic sealing profile is preferably provided on the front side with two sealing lips spaced apart from one another, touching the slider plate, and in the central region with groove-shaped chambers on both sides.

Abstract: A valve for pressurized or liquefied gas comprises a valve body (12) with a gas flow channel (16) and in this channel a sealing seat (30) for an open/close element (32) having a free end (60) where a shoulder (62) is provided. An annular seal (64) is mounted on the free end (60) of the open/close element (32), the annular seal (64) having a front end face (66) facing the sealing seat (30) and a rear end face (68) resting on the shoulder (62) of the open/close body. A holding ring (70) surrounds the annular seal (64) circumferentially and comprises a radial lip (72) that bears on the outer edge of the front end face (66) of said annular seal (64). The annular seal (64) includes an outer annular shoulder (74) on the edge of its front end face and the radial lip (72) with the holding ring (70) has an annular bead (76) facing this outer annular shoulder (74) of the annular seal (64).