Abstract: A valve seal for a butterfly valve comprises a U-shaped annular seating member disposed in an annular slot in the valve body and a retaining ring for holding the seating member in place. The seating member cross-section comprises two legs and a bight portion connecting them. A first one of the legs is captured between the retaining ring and valve body to hold the seating member in the slot and enable limited rotational movement of the seating member. A radially inwardly projecting extension on the bight terminates in an annular sealing surface that cooperates with the valve disc. The seating member divides the slot into first and second axial sides in fluid pressure communication with the valve chamber. The seal also comprises an annular open-helical back-up member disposed in an annular cavity formed in the slot by the legs and bight portion of the seating member. The annular cavity is in fluid pressure communication with the second axial side of the slot.

Abstract: A valve has an externally threaded valve seat sleeve being axially slidably received in a cavity of the valve housing. The sleeve has an end face forming a seat for a valve head and is surrounded by a seal assembly which has a sealing ring being in circumferential engagement with the valve seat sleeve and a part of the housing walls; an abutment mounted on the valve seat sleeve for abutting the sealing ring to prevent an axial displacement thereof in one direction relative to the valve seat sleeve; and an internally threaded sleeve surrounding and threadedly engaging the valve seat sleeve. The internally threaded sleeve has an annular part cooperating with the sealing ring. There is further provided a force transmitting arrangement for applying a torque to the internally threaded sleeve in response to a force applied externally of the valve for rotating the internally threaded sleeve with respect to the valve seat sleeve to axially press the internally threaded sleeve against the sealing ring.

Abstract: A ball valve is provided to transmit high density substances such as fluids which are free flowing at elevated temperatures but which are viscous, semi-solid or solid at ambient temperatures. Such substances tend to clog standard ball valves over relatively short periods of operation whereas the subject ball valve provides means to deter clogging comprising a flow diverter sleeve which prevents substances from penetrating and congealing about internal valve parts.

Abstract: The present invention relates to a cock having a spherical plug which is supported between two annular sealing elements intended to seal the inlet channel and outlet channel thereof, of which two sealing members at least one consists of a resilient sealing member engaging said plug of said cock in an axially prestressed condition and of a coaxially located support member which limits the axial movement of said plug due to an operating pressure, which axial movement causes a deformation of the sealing member. In order to have an excellent sealing of the cock at unlimited temperature and simultaneously small operating moments the annular sealing element is shaped as a thin-walled sheet metal body which at one end is rigidly mounted to the casing of the cock and which sheet metal body comprises two coaxially arranged ring shaped sections, of which the one is shaped and arranged as deformable sealing member and the other is shaped and arranged as rigid support member mounted to said casing.

Abstract: A sliding blade damper is provided with an improved seal arrangement around the blade withdrawal aperture. Two pairs of flexible sealing strips are used, mounted on either side of the aperture and pressing against the opposite sides of the blade. The unattached edges of the sealing strips are curled and bent away from the blade. The curled edges of one pair of strips hook the curled edges of the other pair, so that when the blade is inserted into the damper, the spreading apart of the first pair of strips serves to partially spread apart the second pair as well. In this manner the leading edge of the blade penetrates between the second pair of strips rather easily, lessening the chances that those strips will be bent or torn.

Abstract: A valve assembly of a trunnion type valve such as a ball valve in which a valve seat retainer having a valve seat at its one end is slidably received in a valve casing and a biasing means is provided between the other end of the valve seat retainer and an annular shoulder of the valve casing opposing the former. The biasing means is comprised of a ring and a plurality of spring elements which are kept in a circular arrangement by the connecting ring and each have a substantially U-shaped profile for biasing the two end surfaces of the valve casing and the valve seat retainer. Since the biasing means is simple and can be readily adapted to valves of different sizes, it offers a great advantage in use. Furthermore, the manufacture of the biasing means is simple and causes almost no material loss in the manufacturing process.

Abstract: A water flow control valve has a ceramic shutter plate which is slidable relative to a pressure member having a flat face against which the shutter plate slides. The pressure member is urged against the shutter plate by a tubular resilient sealing element which is subjected to axial compression to produce barrel deformation.

Abstract: A ball valve designed for high pressure shut-off at fluid pressures approaching the ultimate compressive stress of plastic annular seat rings which are employed. The ball member is trunnion mounted in order to carry the total force of the shut-off pressure and the seat rings are disposed in seat ring carriers. Each seat ring includes a spherical ball engaging surface having a radius slightly smaller than the radius of the ball. Each carrier is continuously urged toward the ball by a plurality of disc springs in order that the seat ring engaging surfaces will be in continuous sealing engagement with the ball surface. The seat ring engaging surfaces are configured so that at least the areas thereof located adjacent the outer diameters will be first to sealingly engage the ball.

Abstract: A ball valve structure (10) having a valve seat assembly (46) positioned in annular seat pockets located in a flow passage (14) on opposed sides of a ball valve member (18). Each valve seat assembly is mounted for limited longitudinal movement toward and away from the adjacent ball valve member (18) and spring means (54) are placed within the seat pockets behind the valve seat assemblies to urge the assemblies toward and into intimate contact with the ball valve member. The valve seat assembly includes inner and outer annular concentric seat rings (48, 50) with a resilient sealing ring (52) secured therebetween. The inner annular seat ring has a flared end (64) which fits inside the outer seat ring and energizes or deforms the sealing ring (52) held therebetween, thereby, securely retaining the sealing ring between the seat rings and preventing the introduction of line pressure behind the sealing ring to possibly extrude the sealing ring from its position within the seat rings.

Abstract: An elastomeric sleeve is inserted in the hole in the cock body which has multiple passages for the fluid. A plug, which may be positioned to connect selected passages, is placed within the sleeve in the hole. Either the contacting surfaces between the hole and sleeve or the rubbing surfaces between the sleeve and plug are tapered. A spring, seated on the base of the body or a plug flange, exerts upward pressure on the sleeve to assure tight contact between adjacent surfaces to eliminate fluid leaks.

Abstract: A valve seat for use in a fluid control valve employing a pivotable valve closure element to open and close the valve, the seat comprising an annular polymeric member provided with a seating surface which sealingly engages the valve element when the valve is in the closed position, the seat further including a multiplicity of circumferential windings of strands of material wrapped around said annular member.

Abstract: A gate valve including a valve body having a first bore therethrough for accommodating a reciprocating gate, and further having a second cylindrical bore extending normal to the first bore for fluid flow through the valve. A pair of opposed counterbores are formed in the body adjacent, and on opposite sides of, the first bore and in concentric, axial alignment with the second bore. Annular upstream and downstream seats are seated in the counterbores. A wave spring resting on a shoulder in the body at the bottom of one of the counterbores biases the upstream seat against the gate and maintains sealing when the valve is open.A bonnet is slidably extended through an opening in the valve body, and is forced by fluid pressure into sealing engagement with the body.

Abstract: A ball valve operable between a fully-open position and a closed position for regulating fluid flow includes a valve body machined and arranged with a flow passageway extending completely therethrough and receiving at each end a fluid fitting for coupling to flow lines. Disposed within the interior of the valve body is a ball plug member which is supported below by a stem and needle bearing arrangement and is operable to be turned 90 degrees by a handle, stem and bonnet arrangement. The internal position of the ball plug member is maintained by a pair of ball seats which are centrally disposed within the flow passageway and are held in position by means of adapter cylinders which are in turn held in position by retainer plates. In order to maintain spring-loaded pressure and to provide a sealed interface between the ball seat and the adapter cylinder, spring seal assemblies are disposed within the adapter cylinder and between the ball seat and corresponding retainer plate.

Abstract: A railroad vehicle brake system in which a four-way valve is used to control air flow in brake pipe sections and to the control valve which controls the air supplied to a brake cylinder. The four-way valve includes a housing and a rotatable operating member in the form of a truncated bolt with air channels therein which member can be rotated so as to selectively interconnect or cut-off the brake pipe sections and the control valve. The member has operating shafts integral with the bolt which extend from opposite sides of the housing. Multi-part seals are disposed in openings in the housing to which the brake pipe sections and the control valve are connected and have portions urged into contact with the bolt.

Abstract: A vehicle temperature control system includes a control assembly for directing a fluid actuating medium to selected ones of a plurality of door actuators to position a plurality of doors in selected modes of operation. The control assembly includes a valve housing defining a chamber, a fluid inlet passage and a plurality of opposed inlet cavities and outlet passages. A lever positioned slide valve is shiftable within the chamber. An array of control passages defined by the slide valve selectively place the inlet cavities in communication with the outlet passages. Seal members are disposed in each of the inlet cavities and outlet passages to insure that the fluid medium passes through the control passages. A mode selection lever engages the slide valve and also defines a cam surface for selectively actuating an air conditioner compressor switch.

Abstract: Method and means for solidifying nuclear waste for permanent disposal are disclosed. A storage container, in the preferred form of a drum or barrel, is charged with a predetermined amount of liquid polymer resin in an uncatalyzed state. Catalyst-containing frangible ampoules are also positioned in the drum with a rotatable mixer mechanism. At a waste filling station, the mixer is rotated to break the ampoules so as to mix the catalyst and the resin. The catalyzed resin is then mixed with added waste material to completely encapsulate the waste prior to solidification of the resin. Monitoring of the filling and mixing process is provided by continually sensing the torque force being applied to the rotating mixer mechanism. Where the waste is a dust-like, dry particulate material, dust control means and method are also provided.

Abstract: A novel seat especially adapted for a butterfly valve is provided which is formed both of metal and "soft" material so as to furnish a "bubble tight" seal in normal operating conditions and a metal-to-metal seal in fire situations. The seat is uniquely constructed and is permanently deformed by the disc or closure member of the valve to form a precise size and configuration corresponding to the size and configuration of the disc.

Abstract: A ball valve having an improved relationship between the ball and associated seat rings and an improved seat ring design. The ball is mounted for selective rotation and limited axial movement in a valve body passageway. Seat rings disposed on diametrically opposite sides of the ball about valve inlet and outlet openings each include a ball engaging surface having an arcuate contour. At a relaxed preassembly reference position, the radius of curvature of the ball engaging surface is greater than the radius of curvature of the ball. Frusto-conical disc springs interposed between each seat ring and an associated valve body shoulder additionally urge the seat rings into engagement with the ball. A reinforcing ring disposed at the forward end of each seat ring acts as a rigid bearing surface.

Abstract: A sealing structure for use in valves, including butterfly valves, having a body with a flow passage and a movable valve disc in the flow passage. Two sealing surfaces are mounted in the body to engage the disc when it is in a closed position to provide a bubble-tight seal. The sealing structure includes an annular seal retaining cavity with a slot opening to the flow passage. A metal seal ring having a lip portion (which has a first seat) projecting through the slot into the passage is contained within the cavity adjacent to a primary heat-destructible seal ring, which has a second seat. The first seat and the second seat are engageable with the sealing surface of the disc to provide two axial seals. When the valve is closed, a radially-directed force is developed at the second seat (on the heat-destructible seal) and at the first seat (on the lip portion of the metal seal) in response to contact with the disc to effect a heat-destructible seal and a second, metal-to-metal seal, respectively.

Abstract: A sealing arrangement specifically for shut off devices is disclosed. A shut off device has two annular metallic sealing members of which one is a rigid body and the other is a thin-walled elastically deformable body. One of the sealing members features a considerable large hardness. The other sealing member comprises a coating of a soft metal, filling all irregularities of the surface thereof. Upon closing of the shut off device the surfaces of the two sealing members rub against each other, whereby the coating of soft metal is rubbed off until portions thereof remain in the recesses of the metal forming the substrate of this sealing member. This assures an excellent sealing of the shut off device.

Abstract: A device for enabling the assembly and disassembly of a top entry ball valve takes the form of a pin formed from rod-like material with a conical end. When the pins are inserted into the top surface of the valve housing the spring loaded valve seats are forced backwardly by the advance of the sloped face of the pins. In a second embodiment, the ends of the pins are teardrop shaped. After the pins are inserted, they are rotated 90.degree. causing the seat to be pushed back by the larger diameter of the pin.

Abstract: A device for enabling the assembly and disassembly of a top entry ball valve takes the form of a pin formed from rod-like material with a conical end. When the pins are inserted into the top entry of the valve housing the spring loaded valve seats are forced backwardly by the advance of the sloped face of the pins. In a second embodiment, the ends of the pins are teardrop shaped. After the pins are inserted, they are rotated 90.degree. causing the seat to be pushed back by the larger diameter of the pin.

Abstract: The invention is an improved self-centering, floating metal seal to be used in combination with a ball valve which controls the flow of fluid in a conduit. The ball valve includes a valve body which has a bore extending therethrough and which also has an inlet and an outlet which are axially aligned and adapted to be mechanically coupled to the conduit. The valve body also has an aperture therein. The ball valve also includes a spherical valve member having a port the axis of which is alignable with the axis of the bore of the valve body and a stem having an inner end mechanically coupled to the spherical valve member and an axially outer end which extends through the aperture of the valve body. The ball valve further includes a device for forming a seal between the aperture of the valve body and the stem.

Abstract: The present invention comprises an improved ceramic gate valve having within the valve housing a ceramic valve gate, which is surrounded by a peripherally disposed compression band for providing strength thereto, and which is engaged by a pair of ceramic valve seats, which are in turn urged inwardly for such engagement by ceramic springs. The ceramic springs comprise a plurality of plates of ceramic material separated by spacers which are disposed in a staggered array to form the ceramic spring.

Abstract: Valve seat rings are provided having sediment guard recesses formed in the back face portions thereof, which recesses are in the form of annular grooves having restricted annular openings and defining an internal stop shoulder. A sediment guard is movably positioned within the receptacle and includes an annular sediment blocking portion that protrudes through the restricted groove for sediment blocking engagement with a radial surface defining a portion of the seat recess. The sediment guard also defines a stop portion that is engageable with the stop shoulder to prevent separation of the sediment guard from its receptacle. The sediment guard is urged toward the radial surface of the seat recess by compression springs located within the receptacle.

Abstract: A rotary valve has a fluid seal ring which is loosely captured within a valve body and provides a fluid seal at a peripheral edge of a movable member selectively positionable in a fluid conduit. The seal ring has an annular coaxial recess located on an inner side face thereof. A fixed valve seat member retained in the valve body coaxially with the seal ring has an outwardly projecting cantilever beam in the form of an integral annular ring located on a side face thereof. The end of the cantilever beam is provided with a tapered face arranged to cooperate with a tapered wall surface defining a side of the recess within the seal ring. The contact between the tapered side face of the cantilever beam and the tapered recess surface provides a fluid seal which is selectively positionable along the tapered recess surface to permit a self-aligning action of the seal ring to accommodate varying mechanical eccentricities of the seal ring in its fluid sealing position.

Abstract: The invention concerns a sealing gasket comprising a housing defining a central concavity bordered by two lateral wings, an elastic support housed in the said concavity, a covering presenting a good resistance to wear and a coefficient of low friction which covers over the said concavity and comes back on the lateral wings upon which it comes to be fastened. The invention is applied especially to obturators such as fluid-tight regulator valves.

Abstract: A fluid flow control valve system to be used to control a hydraulic lifting mechanism used on elevators and the like. The valve system includes an inlet conduit from the pump and an inlet-outlet to and from a jack connected together by a conduit with a one-way valve operable in the direction from the pump to the jack, a first by-pass chamber connected to the pump side of the one-way valve and a second by-pass chamber connected to the jack side of said one-way valve, outlets to the pump sump from each by-pass chamber, and a movable gate control mechanism for controlling the exit of pressurized fluid from the first by-pass chamber or the second by-pass chamber through the outlets to the pump sump. Hydraulic fluid from the pump when the first chamber is sealed, passes through the one-way check valve. When the second chamber is also sealed, the fluid will provide pressure to a jack to lift a load. With the first chamber gate opened at least a portion or all of the fluid passes back to the sump.

Abstract: An improved ball-type valve apparatus adapted for use in flowlines which provide a straight through flow path which minimizes flow turbulance and flow resistance in either direction through the valve housing. The ball is rotated by a crank between the open and closed positions for controlling flow through the valve. Oppositely facing seat rings engage the ball on opposite sides to provide a dual redundant sealing system with the primary seals located at the upstream seat with the secondary seal formed at the downstream seat. An access plug retains the ball in the valve housing and is secured with the valve housing by a segmented locking ring. When the plug is removed from the housing maintenance or assembly access to the ball, seat rings and their retaining means without disturbing the connections of the valve housing in the flowlines is provided.

Abstract: The invention relates to guillotine dampers, particularly to those which are used to isolate a section of ductwork without the entire system requiring to be made inoperative. Known dampers of this kind suffer from the disadvantage that a satisfactory seal is difficult to establish around the periphery of the damper blade with the result that it can be hazardous in the isolated section if the remainder of the ductwork system is carrying toxic or otherwise dangerous fluids. According to the present invention, an auxiliary seal is provided in the form of first and second sealing surfaces extending around the periphery of the plane of movement of the blade, which are urged towards each other and into sealing engagement with the blade when in its closed position by means of a frame. The frame is continuously urged to the sealing position by means of devices. Cams act on the frame and are rotatable to selectively overcome the bias of the devices and withdraw the frame to release the damper blade for opening.

Abstract: A shut-off valve for interrupting a flow of a fluid through a pipeline, particularly a flow of high temperature air in a gas main associated with a blast furnace, includes a valve body adapted to be connected to the pipes of the pipeline. The valve body has a pair of spaced walls having openings aligned with each other and with the pipes when the valve body is connected to the pipes. The valve body has therein a chamber. A valve plate is movably mounted within the valve body for movement between a closed position, whereat the valve plate extends between and interrupts communication between the openings, and an opened position, whereat the valve plate is positioned within the chamber and opens communication between said openings. A gaseous cooling fluid is introduced into the chamber. The valve plate has therein channels through which the gaseous cooling fluid passes when the valve plate is in the closed position, to thereby cool the valve plate.

Abstract: A gate valve apparatus suitable for controlling the flow of fluids in a conduit, especially gases in high temperature applications, is disclosed. The apparatus includes a gate member adapted for sliding movement through an aperture in the gate valve assembly. Each opposing side of the aperture has fixedly mounted cooperating flat sealing strips to seal the aperture in both the conduit-open and conduit-closed positions. In certain embodiments a plurality of substantially parallel gate members, each having aperture sealing means, may be used to provide increased sealing effectiveness for highly toxic gaseous mediums.

Abstract: An improved mounting and sealing assembly is provided for a rotating ball valve required to open under increased differential pressures and close against high flow rates. The valve assembly includes a trunnion-mounted ball and two pressure biased sealing assemblies. The primary seal constitutes an elastomeric seal element which is axially shiftable into engagement with the ball, and the secondary seal comprises a metallic element which is also axially shiftable relative to the ball. To open the valve, the seals are moved in sequence axially away from the ball and the hydraulic seal is fully broken before the ball is rotated. In closing, the ball is rotated to its closed position and the seals then moved axially in sequence into contact with the ball.

Abstract: A guillotine damper for a duct is provided with a thrust frame upstream of the path of a blade that is movable into and out of an operative position in sealing engagement with a seat downstream of the blade path when the flow path is not obstructed by the blade and in sealing engagement with and seating the blade against the seat when the blade is positioned to block the duct. Devices are provided with each utilizing resilient components to thrust the frame into its sealing positions and a hydraulic component to retract the frame when the blade is to be moved into or out of its duct blocking position. Each device exerts the force of either component to the frame through a series of mechanical elements spaced a substantial distance apart along the sides of the frames and connected thereto.

Abstract: Valves or cocks with rotary plug in which the plug is provided with flexible gaskets of annular shape located symmetrically with respect to the plane passing through the axis of rotation of the plug and the axis of the cylindrical conduit of the plug, sealing seats borne by the valve body, the seats being arranged in such a manner that they come into contact with the gaskets borne by the plug when the latter is in closed position.

Abstract: A seal for a gas isolator which comprises a cantilever leaf spring to be attached to a fixed frame or a movable member of the isolator and a bias spring acting on the leaf spring, wherein the leaf spring is bent or curved when unstressed whereby in the sealing position of the seal the stress induced in the bias spring will be the same as that induced in the leaf spring where the bias spring and the leaf spring seal have the same section modulus per unit length of seal.

Abstract: A ball valve having a cylinder slidable in a port. The cylinder has a lip which is pressed, by a spring, against a spherical surface surrounding a passage through the ball. A sleeve is slidable to a position over the cylinder, the sleeve having an annular groove adjacent the lip and a first seal therein. The sleeve has a portion contiguous to the cylinder at the end thereof opposite the lip, a second seal being provided between the housing and the sleeve portion. If C is the inside diameter of the lip, if B is the outside diameter of the length of the cylinder having the groove, if A is the outside diameter of the sleeve portion, if A>C, and if C>B, the valve will seal for flow in either direction or for zero flow all at, say, 3000 psi.

Abstract: A ball valve is provided especially for use between adjacent sections of a pipe line conducting an inflammable fluid and comprises a valve housing, a valve ball (2) in the housing and having a through passage, a trunnion in the housing projecting into a first socket in the ball, and a control shaft projecting into and drivingly engaging a second socket in the ball diametrally opposed to the first socket. A pair of annular valve seat members (4) spaced axially of the pipe line carry sealing rings (8), spring means (9) urging the seat members towards the ball. Each seat member at its end adjacent the spring means has a frusto-conical portion (11) which tapers from a shoulder (12) on the seat member towards the end face (4A) of the latter. A graphite ring (13) is fitted between the frusto-conical portion and the adjacent peripheral wall of the housing and a first spacer ring (14) is located between the graphite ring and the shoulder.

Abstract: A bi-directional valve sealing means for location in a chamber formed by diverging juxtaposed surfaces on the valve body and the retaining means removably affixed to the valve body. The sealing means extends into the passage through the valve body for rotation about a point in the chamber, the sealing means becoming wedged into fluid-tight contact with the valve closure means when the valve closure means is rotated to block the flow of fluid through the valve passage.

Abstract: A rotary shut-off valve featuring an eccentric shaft mounted disk having a spherical periphery co-operating with a flexible metal seal, the latter forming a circle whose center is offset from and rotatingly mounted around the central valve axis to enable alignment with the central axis of said spherical disk periphery to effect tight shut-off.

Abstract: An improved mounting and sealing assembly is provided for a rotating ball valve required to open under increased differential pressures and close against high flow rates. The valve assembly includes a trunnion-mounted ball and two pressure biased sealing assemblies. The primary seal constitutes an elastomeric seal element which is axially shiftable into engagement with the ball, and the secondary seal comprises a metallic element which is also axially shiftable relative to the ball. To open the valve, the seals are moved in sequence axially away from the ball and the hydraulic seal is fully broken before the ball is rotated. In closing, the ball is rotated to its closed position and the seals then moved axially in sequence into contact with the ball.

Abstract: A Fire Safe Seal for a valve having a metallic seat ring slidable in a cylindrical internal surface with an elastomer ring sealing between the seat ring and the internal surface. An elastomer seal ring or even a highly finished surface on the leading face effects a seal with the valve closure member. An emergency seal ring having a forwardly extending, sharp annular lip with an internal chamfer is engageable, when forced, over a complementary chamfer around the trailing end of the seat ring and into the clearance around the seat ring to seal it off. A spacer ring of a heat destructible material is interposed between the emergency seal ring and the seat ring to render the emergency ring inactive normally.

Abstract: A valve seat assembly adapted to fit within an annular groove in a butterfly valve body. The seat assembly includes a pair of opposed metal seat rings generally L-shaped in cross section with overlapping outer legs seated and anchored in the bottom of the groove. The seat rings have flexible free inner end portions extending radially inwardly of the groove terminating at outwardly curled arcuate ends which contact the sealing surface of the valve disc and extend laterally of the groove in spaced relation to and over the adjacent valve body. A resilient soft seal is mounted between the metal seat rings and the sides of the metal seal rings are corrugated to grip and retain the soft seal in place.

Abstract: A ball valve having a seat assembly (46) in the form of a flexible metal holder (52) which carries a resin impregnated graphite face seal (54) contacting the ball (28). Flexibility of the holder is provided by a leg (58) thereof which terminates in a free end having an annular lip (62) in sealing contact with the valve body. In a modified arrangement, the upstream seat has an annular space exposed to the upstream flow passage in order to increase the sealing force, while a corresponding annular space of the downstream seat is exposed to the valve chamber to increase its sealing force when the body pressure exceeds the downstream pressure.

Abstract: A valve seat especially adapted for a high performance butterfly valve is characterized by flexing axially rather than stretching radially when the seat interfaces with a closure member. In the preferred form, a seat has a support member embedded therein to provide restorative forces which tend to urge the valve seat to a predetermined position in response to axial flexing.

Abstract: A valve seat contains a seat ring (12) with flat, parallel side faces (19, 20). The seat ring consists of steel or possibly of PTFE. When the valve is being shut by a throttle (1), a sealing surface of the throttle is pressed against the seat ring which adopt itself as to form and position to the mean line of the throttle, and the seat ring is displaced in a groove (18) in the plane of the seat. A couple of spring washers (10, 11) sealingly engage the parallel side faces of the seat ring. When the throttle is reopened the spring washers secure the seat ring in its position.

Abstract: A ball valve includes a metal valve seat (36) carrying a relatively soft insert (40) which seals against a ported ball member (22). A packing ring (72) surrounding the seat is compressed between a spring loaded metal wedge (84) and a metal backup ring (66) to provide a seal between the seat and valve body. If the soft seals are destroyed by fire, the metal seat is pressed against the ball member to provide a metal-to-metal seal. Additional metal-to-metal seals are provided between the seat and valve body by the metal wedge and backup ring.

Abstract: A packless magnetically actuated stopper valve. A driven magnet assembly is rotatably mounted inside a nonmagnetic bonnet. A drive magnetic holder surrounds the bonnet and rotates thereon. The driven magnet assembly turns a stopper positioned in the main valve body between inlet and outlet passages. Floating valve seats associated with each passage sealably engage the stopper.

Abstract: A ball valve is disclosed having two seat rings on each side of the closure member. Each seat ring is operative independently of the other and each ring is sealed with respect to both the ball and with respect to the body independently of the other seat ring. One of the seat rings employes metallic fire resistant seals to seal with respect to both the body and the ball.

Abstract: A valve housing is adapted to be built into a pipeline, and a valve plate is movable into a valve-closing position in the housing. A displaceable sealing member provides a seal between the valve plate and the housing. At least one spring tends to displace the member into sealing position, and at least one pressure-medium actuated bellows is arranged, upon receiving the pressure medium, to displace the member away from sealing position.