Abstract: A bonnet for a gate valve is provided or retrofitted for minimizing sand-packing and minimizing interruption of operations. An annular recess is formed about the stem, the resulting profile and dimensional modification effective to minimize packing effects when stroking the gate to the retracted position. In an embodiment, the annular recess is one or more of a cylindrical or conical recess. In another embodiment, wherein a retracted gate stops against the bonnet, one or both of the bonnet and gate interface is fit with beveled surfaces for receiving sand that accumulated on the stop.

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 valve includes a stem seal assembly that prevent fluid flow in a first direction and vents in a second direction opposite the first direction. The assembly includes a packing assembly positioned within a valve stem opening of a valve body of the valve to seal a valve stem to the valve body. The packing assembly includes a first seal and a second seal preventing passage of fluid from a body cavity of the valve body to an exterior of the valve body along the valve stem while venting fluid from an exterior of the valve body to the body cavity along the valve stem. The packing assembly isolates the first seal and the second seal so that a load applied to the first seal ring is not transferred to the second seal ring.

Abstract: A pressure protection valve (10) is provided featuring a swivelable output port fitting (40) and a valve element (60) having a portion (64) configured to redirect a portion of the fluid flow toward the fixed seat (30) upon initial opening of the valve (10). The valve element (60) is in a portion of the fitting that is inserted into a pressure container so as to be protected from external forces. The valve (10) may also include a vent cover (110) sealing the vent port (80), the vent cover (110) movable to vent pressure through the vent port (80) when the valve (10) opens and to relieve pressure through the vent port (80) when the valve (10) closes.

Abstract: A ventilatory valve controls a pressure level in a patient breathing circuit of an anesthetic breathing apparatus. The ventilatory valve has a valve unit having a controllable restriction to control the pressure level in an expiratory branch of the breathing circuit of the anesthetic breathing apparatus, an electrical operating unit for the valve unit, configured to electrically control the restriction during electrical operation of the anesthetic breathing apparatus, and a non-electrical operating unit (100) for the valve unit, configured to non-electrically control the restriction upon electrical defective or powerless operation of the anesthetic breathing apparatus.

Abstract: A bellows seal assembly and bellows valve equipped therewith. The bellows seal assembly includes an internal bellows, an external bellows, a hollow upper bellows seat, a first hollow lower bellows seat, and a second hollow lower bellows seat. One end of the internal bellows is fixed to the upper bellows seat and the other end is fixed to the second lower bellows seat. One end of the external bellows is fixed to the upper bellows seat and the other end is fixed to the first lower bellows seat. The external bellows is sheathed around the internal bellows. The first lower bellows seat is sheathed around the second lower bellows seat. The bellows valve includes the bellows seal assembly.

Abstract: A gate valve assembly having a body, a gate, a stem, and a backseat for sealing between the stem and the body. The backseat is an annular member with a complementary surface on its inside that fits over a spherically shaped section of the stem; thus allowing the backseat to rotate and pivot with respect to the stem. An outer surface of the backseat is beveled for sealingly engaging a stem passage formed through the body. A flex member is provided that is for sealing a surface adjacent the backseat. The flex member can form a seal between the backseat member and the stem or between an annular retainer and the backseat.

Abstract: A valve assembly for use in regulating a fracturing fluid that includes an actuating stem for actuating a gate, a balancing stem, and a backseat on the stem that defines a backseat seal when urged against a profile in the valve assembly. The backseat seal is energized by applying a force to an end of the balancing stem. An end of the balancing stem is enclosed within a plenum, so that the force on an end of the balancing stem can be applied by pressurizing the plenum. The assembly can be on an opposite side of the valve body/bonnet to create a backseat seal on a balancing stem/bonnet to allow changing the stem packing on the balance stem side while maintaining pressure integrity.

Abstract: A valve for a pressure vessel system includes a housing having a cavity defined by an inner surface of the housing. The housing further includes a rod aperture and a pair of fluid flow ports. An actuator is disposed adjacent the housing. The valve also includes a piston having a rod coupled to a piston head. The piston head is disposed in the cavity of the housing, and the rod disposed through the rod aperture. The rod is also coupled to the actuator. A ring seal is disposed between the piston head and an inner surface of the housing. The ring seal biases the piston head toward one of the fluid flow ports and seals the one of the fluid flow ports to close the valve when the actuator is deactivated. The ring seal is elastically deformed and the fluid flow ports are opened when the actuator is activated.

Abstract: The invention relates to a drainage assembly of the type having an upward opening for the draining opening of a new or existing chemical reactor, particularly of the enameled type, characterized in that the outer outlet opening (6) for the drainage is provided in the lower portion thereof with a removable seat part in the form of a planar annual seal (11) having an upper portion with at least one recess (21) used as a seat for the under-face of the head (10) of the valve and as a full flow ramp. The invention is particularly intended for the manufacturers and users of chemical reactors, in particular of the enameled type.

Abstract: A biasing apparatus includes a first spring seat that has a first seating surface and a first protruding member extending a predetermined distance from the first seating surface and a second spring seat that has a second seating surface and a second protruding member extending a predetermined distance from the second seating surface. The first and second protruding members engage to slidably couple the first and the second spring seats.

Abstract: A water controlling valve includes an outer sheet, an end cap and a control valve group. The control valve group is disposed between a flowing bore in the outer sheet and a water bore in the end cap. The water controlling valve is connected with the outlet of a water tube. When the control valve group is pushed upwards, the water bore in the end cap and the flowing bore in the outer sheet are closed in a predetermined sequence, then the water in the tube will not flow out. When the control valve group is pushed downwards, the flowing bore in the outer sheet and the water bore in the end cap are opened, then the water will flow out. When the water is stopped, the occurring positive or negative pressure wave is lowered, and then the vibration and the raspy noise will be avoided.

Abstract: A non-interchangeable two-component connecting valve capable of connecting a fuel supply to a fuel cell or other device is disclosed. One component of the connecting valve comprises at least one center post and one internal elastomeric seal, which opens when moved or compressed by a correctly sized and dimensioned mating tube from the other component. In one embodiment, only one valve component has one or more internal seals. In alternate embodiments, both valve components have one or more internal seals, which can open simultaneously or sequentially.

Abstract: A cistern outlet valve assembly (10). The assembly includes an outlet orifice (14) and a buoyant member (20). The buoyant member (20) has an outlet seal (22) on one side and a housing seal (26) on the other. The assembly (10) also includes a valve housing (18) is adapted to cover the buoyant member (20). The housing (18) has large clearance guide means (30) adapted to guide movement of the buoyant member (20) from a closed position in which the outlet seal (22) seals against the outlet orifice (14) and an open position in which the housing seal (20) seals against the housing (18). When the buoyant member (20) is in the open position any fluid incident on the guide means (30) is prevented from flowing onto the buoyant member (20) by the housing seal (20) sealing against the housing (18).

Abstract: A gas separation device for separating oxygen gas from air includes a compressor; a concentrator; a measurement mechanism; and a flow control mechanism that includes a valve assembly for providing fluid flow control, the valve assembly having a motor; a valve body; and a plunger within the valve body and reciprocally driven by the motor, wherein the valve body including a fluid inlet, a fluid outlet, and a flow chamber therebetween, the flow chamber including a flow chamber wall and a flow chamber outlet, the plunger including a flexible member reciprocating within the flow chamber outlet to provide variable flow control therethrough, the flexible member including a lip seal engageable with the flow chamber wall during reciprocation of the plunger and flexible member to provide a seal therebetween.

Abstract: A two-port valve includes a valve part configured to open and close a valve seat in a liquid flow path connecting a first port and a second port by a valve member and a pilot-type valve driving mechanism to open and close the valve member through a rod. The rod passes through an insertion hole of a plate facing on the liquid flow path in a sealed state. The valve member is provided to the tip part of the rod and also a cap which abuts against the periphery of the insertion hole of the plate when the valve member opens the valve seat and prevents intrusion of foreign material in the liquid into the insertion hole is provided to the rod.

Abstract: A gate valve has a body having a cavity and a stem passage extending from the cavity. A stem extends through the stem passage into the cavity for moving a gate in response to rotation of the stem. A conical backseat seal surface is formed at a junction of the stem passage with the cavity. A backseat seal has a leg extending outward from the stem and away from the stem passage. The leg has an outer surface with a sealing band that is spaced from the backseat seal surface during normal operation of the valve. The leg is flexible, causing the sealing band to deflect into sealing engagement with the backseat seal surface when the stem is moved axially to a backseat sealing position.

Abstract: A valve assembly for insertion in a pipe containing fluid under pressure includes a valve body adapted to be assembled over the pipe and a valve-stopping mechanism that mounts on the valve body. The hollow valve body interior and an access opening in the valve body are sufficiently large to receive a hole saw element no smaller than the outside diameter of the pipe as installers advance the hole saw element radially through the access opening to form a gap in the pipe. The valve-stopping mechanism includes a gate with a cross sectional area greater than the pipe that mates with the valve body interior so that the gate can be advanced radially through the gap in the pipe into direct fluid-tight contact of the valve body in order to thereby stop the flow of fluid through the pipe.

Abstract: Valve having a valve housing, a valve member slidable in the valve housing between open and closed positions, and a friction reducer to reduce friction between the valve member and the valve housing. The friction reducer comprises at least one guide shoe made of low friction material, to provide a low friction sliding surface, the guide shoe being removably insertable into a slot in the valve member. The guide shoe is arranged to cooperate with the slot such that the ends of the slot prevent the guide shoe from being extracted from the valve member in the direction of movement of the valve member, when the valve member is in position with the valve housing.

Abstract: A valve having a valve packing removal device attached thereto is disclosed. The valve may include a valve plug reciprocally disposed within the valve housing and connected to a sliding stem. The packing may be provided about the valve stem to ensure or minimize leakage of regulated fluid from the valve. A sleeve may have a diameter less than a bore in which the packing is disposed and may be connected to the valve stem such that when the valve stem is sufficiently pulled from the valve, the sleeve engages the packing and pulls the packing from the valve.

Abstract: A slit valve for a semiconductor processing apparatus, for fluidly sealing a passage connecting two chambers of the apparatus, such as a substrate reaction chamber and a region outside the reaction chamber. The slit valve comprises an actuator plate movable within a slot in one wall of the passage, the actuator plate and the slot oriented generally transverse to the passage. The actuator plate has a first position in which the valve is open, permitting the transfer of a substrate through the passage. The actuator plate also has a second position in which the valve is closed, and in which the actuator plate fluidly seals the passage such that fluid cannot flow through the passage across the actuator plate. A protective cover is configured to prevent debris within the passage (e.g., broken wafers, shards, particulate contaminants, etc.) from flowing into the slot when the actuator plate occupies its second position.

Abstract: An exhaust gas recirculation valve assembly including a bushing and pintle shaft sub-assembly having a pintle shaft supported by a sleeve bushing, the contact area between the shaft and bushing being reduced such that coking deposits that form on the remaining contact area can be broken by the force of the valve actuator, thereby preventing sticking of the valve from coking accumulations. Either the shaft surface or the bushing surface is relieved in a pattern of incuse areas and residual bearing areas. A currently preferred pattern is a helix.

Abstract: A needle valve assembly for providing fluid flow control includes a motor; an internally threaded valve body; and an externally threaded plunger threadably engaged with the internally threaded valve body and rotatably and reciprocally driven by the motor, wherein the valve body including a fluid inlet, a fluid outlet, and a flow chamber therebetween, the flow chamber including a flow chamber wall and a flow chamber outlet, the plunger including a flexible needle member reciprocating within the flow chamber outlet to provide variable flow control therethrough, the flexible needle member including a lip seal engageable with the flow chamber wall during reciprocation of the plunger and flexible needle member to provide a seal therebetween.

Abstract: A balanced plug valve having substantially reduced shut-off force requirements due to an integral dual seating arrangement of the valve plug within a valve housing having slanted inlet and outlet ports and wherein the inlet port forms an elliptical opening for fluid control which is selectively exposed by a cylindrical portion of a sliding valve plug.

Abstract: A slit valve for a semiconductor processing apparatus, for fluidly sealing a passage connecting two chambers of the apparatus, such as a substrate reaction chamber and a region outside the reaction chamber. The slit valve comprises an actuator plate movable within a slot in one wall of the passage, the actuator plate and the slot oriented generally transverse to the passage. The actuator plate has a first position in which the valve is open, permitting the transfer of a substrate through the passage. The actuator plate also has a second position in which the valve is closed, and in which the actuator plate fluidly seals the passage such that fluid cannot flow through the passage across the actuator plate. A protective cover is configured to prevent debris within the passage (e.g., broken wafers, shards, particulate contaminants, etc.) from flowing into the slot when the actuator plate occupies its second position.

Abstract: A back seating valve includes a valve body enclosing a valve plug with a threaded through-bore; and a valve element with a threaded valve stem and valve head. The valve plug and valve stem are initially preassembled, and then inserted into the valve body. The valve body is mechanically formed to retain the valve plug in the valve body without the use of welding or brazing. The valve plug has an external, non-cylindrical geometry which prevents the valve plug from rotating within the valve body. The valve plug is axially held between a shoulder and a narrowed-down end in the valve body. An external portion of the valve stem can be rotated to move the valve head into open, intermediate and closed positions between a front valve seat in the valve body, and a back valve seat in the valve plug.

Abstract: A valve stem seal assembly includes an elastomeric sealing member for sealing between a reciprocally moveable valve stem and an associated valve guide in an internal combustion engine. The assembly includes a cylindrical retainer that incorporates an end wall at a first end thereof for securing the elastomeric sealing member to the retainer. The valve assembly is installed over the valve guide, and the retainer is adapted for frictional securement to the guide, whereas the retainer extends down to and engages the surface or deck of the associated engine cylinder head. The retainer includes a radially extending bottom flange at a second end opposite the end wall, wherein the flange bears directly against the cylinder head deck. The upper surface of the flange provides a bearing surface for valve return springs, while the bottom surface of the flange includes an elastomeric sealing media bonded thereto.

Abstract: The valve 10 includes a valve main body 11 having an opening 11A and forming a space which creates a part of a gas flow path, a first valve member 12, provided in the valve main body, for opening/closing the opening 11A, and a drive mechanism 40 for moving the first valve member 12 between a close position where the opening 11A is closed and an open position where the opening 11A is opened, wherein the drive mechanism 40 has a rod 14 to be reciprocated, an end of the rod 14 extends into the valve main body 11 through a through hole 11B formed in the valve main body 11 to be connected to the first valve member 12, the first valve member 12 is moved between the close position and the open position as the rod 14 is driven reciprocated, and the valve further comprising a sealing mechanism 15, which communicates into the valve main body 11 via the through hole 11B, for isolating the drive mechanism 40 side air-tightly from the valve main body, and a second valve member 17, provided on the rod 14 to move together w

Abstract: A control valve for a variable displacement compressor is provided. A retainer cylinder in the control valve includes a first cylindrical member made of non-magnetic material and a second cylindrical member having a bottom portion made of magnetic material. A shim is intervened a bottom surface of a plunger and inner bottom surface of the second cylindrical member. The retainer cylinder has good magnetic permeability between a coil and the plunger, even though the wall of the cylinder thickens to improve the withstanding pressure to internal refrigerant pressure.

Abstract: A valve stem seal assembly includes an elastomeric sealing member for sealing between a reciprocally moveable valve stem and an associated valve guide in an internal combustion engine. The assembly includes a cylindrical retainer that incorporates an end wall at a first end thereof for securing the elastomeric sealing member to the retainer. The valve assembly is installed over the valve guide, and the retainer is adapted for frictional securement to the guide, whereas the retainer extends down to and engages the surface or deck of the associated engine cylinder head. The retainer includes a radially extending bottom flange at a second end opposite the end wall, wherein the flange bears directly against the cylinder head deck. The upper surface of the flange provides a bearing surface for valve return springs, while the bottom surface of the flange includes an elastomeric sealing media bonded thereto.

Abstract: A valve for sampling a process from a tank or conduit includes an internal cavity in communication with at least one inlet and an outlet. A valve actuating rod includes a sealing tip attached to one end thereof. The valve actuating rod is movable to open and close the inlet to the internal cavity. Furthermore, a seal is provided to isolate the valve actuating rod and the outside environment from the process. The seal is formed on the process side of the bottom wall of the internal cavity in order to ensure that the process material, cleaning material, steam, etc. drains completely out of the internal cavity of the valve.

Abstract: A back seating valve includes a valve body enclosing a valve plug with a threaded through-bore; and a valve element with a threaded valve stem and valve head. The valve plug and valve stem are initially preassembled , and then inserted into the valve body. The valve body is mechanically formed to retain the valve plug in the valve body without the use of welding or brazing. The valve plug has an external, non-cylindrical geometry which prevents the valve plug from rotating within the valve body. The valve plug is axially held between a shoulder and a narrowed-down end in the valve body. An external portion of the valve stem can be rotated to move the valve head into open, intermediate and closed positions between a front valve seat in the valve body, and a back valve seat in the valve plug.

Abstract: A deodorizer device for deodorizing shoes, includes a container containing deodorizer material, and a dispenser assembly at one end of the container for dispensing deodorizer material. The dispenser assembly includes a feed tube having one end located within the container and the opposite end communicating with one or more discharge openings for discharging deodorizer material laterally of the container. The dispenser assembly further includes an actuator attached at one end to the feed tube and configured to enable the actuator to be inserted into a shoe, when the container is inverted, to stably support the container in the inverted position, and to be pressed against the inner surface of the shoe bottom for discharging a quantity of deodorizer material from the discharge opening laterally into the shoe.

Abstract: Provided is a gate valve for opening and closing an aperture formed in a body of a chamber and designed so that an object is loaded into or unloaded from the chamber, comprising a lift mechanism provided on a side portion of the chamber body, a supporting portion supported by a lift mechanism for up-and-down motion, a valve plate supported by the supporting portion and movable between a closed position such as to close the aperture of the chamber body and an open position such that the valve plate is separated from the aperture to leave the aperture open as the supporting portion is moved up and down by the lift mechanism, and a separating mechanism for allowing the valve plate to move to a position ahead of the aperture so that the valve plate is separated from the aperture.

Abstract: A sealing assembly is provided for securing an opening in a seat having a seating surface. Typically, the sealing assembly of the present invention adapted for use with, for example, a dual-chamber orifice fitting. The sealing assembly comprises a drive, a carrier, a strip, a stop and a guide. The drive is actuateable for movement. The carrier is associated with the drive and moveably actuated by the drive. The strip is engaged with the drive for moving with the drive or at a right angle to the drive. The stop is engageable with the strip such that when the strip and the stop are engaged, the strip moves at a right angle to the drive, and when the strip and the stop are not engaged, the strip moves with the drive. The guide secures the strip, the carrier and the drive for operation in any orientation. When the stop is sufficiently displaced from the drive and the strip, the opening in the seat is unobstructed.

Abstract: An electromagnetic valve particularly suited for use in an internal combustion engine includes a housing, a coil, a magnet armature guided within the coil, and a spring-actuated valve body interacting via a tappet with the magnet armature. The valve body includes a bead disposed on the side of the valve body facing the coil, wherein when the valve is in the completely open state, the bead contacts the coil.

Abstract: A back seat rising stem gate valve has a valve body with a flow passageway through it and an open top, a gate that is vertically positioned to open and close the passageway, a stem extending upwardly from the valve body, the lower end of the stem being attached to the gate, a bonnet secured to the valve body by which the valve body open top is closed, the stem extending through an opening in the bonnet, a packing box slidably positioned in an opening in the bonnet and receiving the stem, the packing box having a back seat circumferential sealing surface surrounding the valve stem, and the valve stem having an integral enlarged diameter shoulder so that when the stem is in the full upward position the packing box can be displaced downwardly forcing the back seat sealing surface to seal against the stem shoulder to seal against fluid leakage along the valve stem. In one embodiment the packing box is downwardly displaced by hydraulic pressure, such as hydraulic pressure supplied from within the valve body.

Abstract: A shut-off valve (1, 101) including a valve housing (2, 102) having a flow passageway (3, 103); a shut-off member (22, 122) displaceably arranged in the housing between an open position and a closed position of the valve flow passageway through an actuator device (15, 115). The actuator device includes a nut member (20, 120) provided with an internal thread (21, 121) having a first thread pitch, and an outer stem member (17, 117) provided with an external thread (19, 119) engaging the internal thread (21, 121) of the nut member, and with an internal thread (18, 118) (21, 121) with a second pitch differing from the first pitch and engaging a corresponding external thread (12, 112) on an inner stem member (6, 106). The threads coacting during the major part of the closing movement of the shut-off member (22, 122) are provided with larger pitch than those coacting during the final part of the closing movement.

Abstract: A valve, having provision for replacing stem packing while the valve is under pressure, has a valve body with a flow passageway through it, a gate that is vertically positioned to open and close the passageway, a stem extending upwardly from the valve body, the lower end being attached to the gate, a bonnet secured to the valve body by which the valve body open top is closed, the stem extending through an opening in the bonnet, a packing box slidably positioned in an opening in the top of the bonnet and receiving the stem, a back seat ring is positioned within the opening of the bonnet below the packing box and having a circumferential sealing surface surrounding the valve stem, the valve stem having an integral enlarged diameter shoulder so that when the stem is in the full upward position the packing box can be moved downwardly in the direction towards valve body forcing the back seat ring sealing surface to seal against the stem shoulder formed on the valve stem to permit packing retained within the packin

Abstract: In combination with a gate valve comprising a valve body having an internal cavity extending between an inlet port and an outlet port, a bonnet mounted to the valve body and having an internal passageway in communication with the cavity, a valve stem rotationally supported in the passageway, a handle connected to one end of the valve stem and a gate threadedly connected to the other end of the valve stem, the improvement comprising a first packing for sealing between the bonnet and the valve stem to prevent pressure within the cavity from escaping through the passageway, a second packing for sealing between the bonnet and the valve stem to prevent pressure within the cavity from escaping through the passageway, the second packing being located between the first packing and the cavity, a bypass port extending between a first portion of the passageway below the second packing and a second portion of the passageway above the second packing, and a bypass valve for selectively closing the bypass port such that the

Abstract: The present invention is directed to a dual backseat valve assembly comprising a valve body having an interior valve chamber and a generally horizontal flow passage; a valve gate adapted to reciprocate vertically within said valve chamber; a valve stem adapted to be received in threaded engagement with a gate lift nut mounted in said gate such that rotation of said stem causes vertical movement of said gate and a valve bonnet fixed to said valve body receiving said stem therethrough; wherein the valve stem comprises a radially extending portion defining a downward facing surface, a first enlarged diameter portion proximate the radially extending portion and a reduced diameter portion adjacent the first enlarged diameter portion; a first backseat seal comprising a radially energized seal ring fixed relative to said bonnet and having a first sealing portion for sealing against said bonnet and a second sealing portion which is adapted to be spaced apart from said reduced diameter portion when said valve is in no

Abstract: An automatic lubricator which includes a cylindrical oil container, a piston reciprocated in the oil container, a container holder covered on the bottom open end of the oil container and having an oil inlet and an oil outlet, two reversed coil springs concentrically mounted in the oil container to force the piston downwards in closing the oil inlet and oil outlet of the container holder, a control switch fixed to the container holder and having an adjustment screw turned to control the flow rate of the oil outlet, and a valve assembly installed in a hole on the control switch to control the passage of the oil inlet of the container holder.

Abstract: The present invention provides a sleeved seal, as well as the method of installing and machining said sleeved seal. The seal comprises a unitary configuration of a backseat and a sleeve for a stuffing box area, comprising a valve stem bore in communication with a stuffing box area internal to the sleeve seal and a machined backseat and sleeve along the outer diameter of the sleeved seal.

Abstract: A backseat assembly for an expanding gate valve includes a sealing member slidingly disposed about the stem and a biasing member biasing the sealing member away from the gate. Upon the gate and segment traveling to the open position of the valve, the segment engages the valve housing and stops its further movement. The stem and gate continue their travel with the sealing member engaging an annular seat on the housing for sealing between the stem and housing. The sealing member includes an annular resilient sealing member which initially engages the annular seat of the housing. The biasing member places a preload on the sealing member such that upon engagement of the annular seat by the sealing member, there is initial sealing force placed on the sealing engagement. The fluid pressures within the valve chamber add an additional sealing force to the sealing member.

Abstract: A gate valve adapted for stem back seating has a stem and bonnet assembly with a rotatable bearing ring to which the stem is releasably fixed during normal gate opening and closing operations. During back seating, the stem is released from the bearing ring and the bearing ring is fixed to the bonnet cap, enabling low torque back seating by rotation of the stem relative to the bearing ring and bonnet cap.

Abstract: A stream selector for a process analyzer. The stream selector includes a valve module having two block valves and a bleed valve. In a first mode, the block valves are closed and the bleed valve is open. In a second mode, the block valves are open and the bleed valve is closed. In a third mode, all of the valves are open, thus ensuring that the module is completely purged. A stream-selection valve manifold is made by joining two or more valve modules side by side to form a common outlet and a common passageway, thus ensuring that the manifold is completely purged. The stream selector also provides a single block-and-bleed valve module having a disposal passageway which establishes fluid communication between a vent compartment and an external area suitable for the safe disposal of sample fluids and compressed gas contained in the valve module.

Abstract: A stop valve assembly comprises two closure members one for stopping substantive gas or liquid flow and the other to prevent leakage along a spindle section 33. Each member possesses a closure element in the form of a rigid disc-like member (9 or 34) of accurately predetermined thickness lying in a recess (1 or 3) formed round the end opening of a duct or around the spindle section and having exactly the same depth as the thickness of the disc. Over the disc outer surface 11, and the end face around the recess is located a flat annular deformable seal member (14, 64); this can be secured at in relation to the disc member, so as to travel with the disc member 9 as a stop valve, or can be secured against the said face around the recess so as to define an antileakage spindle seal. Since no deformed seal is used and since no packing is used in the screw spindle mechanism, high actuating force is unnecessary.

Abstract: A shut-off fitting with a sealing device consisting of a packing casing and a packing gland for the actuation element of the valve has the packing casing including bores that hold the sealing elements. The packing has at least one grooved metal ring with an elastic ring seal on the side facing the actuation element and the bore. As a seat for an elastic ring seal the packing gland features an oblique shoulder which descends toward the center, whereby the ring seal bears the pressure conveyed by a ring element and produced by a spring in the longitudinal direction of the axis of the actuation element.

Abstract: The invention is directed to a valve stem double backseat seal wherein the rising stem first engages a non-metallic radial seal and then axially engages the metal backseat shoulder of the valve bonnet.

Abstract: A metal-to-metal backseating system for fluid flow control valves, comprising a flexible annular backseat element extending radially from a valve stem or closure element to sealingly engage a valve bonnet surface, and an annular backup for the backseat element.