Abstract: A metal sealing system for a triple eccentricity butterfly valve includes a dynamic metal seal, having a metal core surrounded by an external coating; a metal case with an external surface that has an inclined conical shape, including a first housing inside which the dynamic metal seal is mounted; a metal cover fixed to the metal case to allow it to close by flush fitting of the upper or lower faces of the metal cover and the metal case, the metal case having a second housing into which the metal cover fits, the dynamic metal seal being located between the metal cover and the surface of the metal case defining the first housing.

Abstract: Example aspects of a valve are disclosed. The valve can comprise a valve body defining a first end, a second end opposite the first end, an inner surface, and an outer surface, the inner surface defining a body bore extending from the first end to the second end and a channel extending radially outward from the body bore, the channel defining a seat retention groove; a metal barrier applied to the inner surface and covering the seat retention groove, the metal barrier defining a first edge and a second edge, the first edge oriented between the seat retention groove and the first end, and the second edge oriented between the seat retention groove and the second end; and a valve seat positioned within the channel.

Abstract: A guide vane bearing for a hydraulic machine is provided, which may be serviced from the side of the water flow path, and a method for installing and removing a bearing of this type. The guide vane bearing includes a bearing support and a layer of bearing material and at least three segments, which are separately connectable to the bottom ring of the hydraulic machine, each segment including one part of the bearing support and one part of the layer of bearing material, and a joint between the segments being obliquely formed with respect to the bearing axis, so that one segment has a wedge shape, and the bearing furthermore including a bearing seal, and the bearing seal being rotatably fixedly connected to the trunnion of the guide vane, and the bearing support including a surface, which is designed as a running surface for the lip of the bearing seal.

Abstract: A process including: an assembly step of assembling a sealed case onto an existing pipe; a cutting step of forming a first opening of a groove shape elongated in a pipe axis direction of the existing pipe; a second boring step of forming a circular second opening at a position of the existing pipe that opposes the first opening; and an insertion step of inserting, in a valve-open state, a butterfly-shaped valve element that is integral with a valve rod, which runs through the first and second openings, into the existing pipe 1 through the first opening until a tip portion of the valve rod protrudes from the second opening.

Abstract: An air valve includes a valve body having an inner surface and an outer surface, the inner surface and the outer surface defining an inlet and an outlet; a sealing device mounted within the valve body, the sealing device including a first contacting portion and a second contacting portion; and a float moveable within the valve body, the float having a first sealing position and a second sealing position.

Abstract: A butterfly valve seal arrangement in a butterfly valve having a cylindrical flow channel with a wall includes a seal flange, an elastomeric seal, a seal channel, and an annular seal retaining ring. The seal flange extends into the cylindrical flow channel from the wall of the cylindrical flow channel. The seal channel is recessed into the wall of the cylindrical flow channel adjacent to the seal flange. And the annular seal retaining ring includes tabs extending into the seal channel which hold the annular seal retaining ring in the cylindrical flow channel. An elastomeric seal is held in compression in the seal channel and against the seal flange by the annular seal retaining ring, and extends into the cylindrical flow channel forming a seal surface held in compression against a vane seat of a vane in a position perpendicular to a direction of flow.

Abstract: A rotation axis O2 of a shaft 3 is attached thereto with double-offset in the X and Y directions with respect to a center line O1 of a valve seat 2. A bevel process is implemented on the outer peripheral surface of a valve 1 such that the valve 1 and the valve seat 2 is line-sealed, and the sign of the angles of inclination is switched between plus and minus at two places of the outer peripheral surface of the valve 1 deviated from the center of the axis. Further, a section where the angle of inclination is constant is prepared in each of the sections connecting the two places, while the other sections are smoothly connected to each other.

Abstract: Disclosed is a butterfly valve capable of controlling a flow of a fluid according to a rotation of a disk. The butterfly valve includes a body provided with an inner space having two open ends; a disk unit having a disk rotatably installed at the inner space, and configured to selectively open and close the inner space according to a rotation of the disk; a first seat portion protruding from an outer circumferential surface of the disk; a second seat portion protruding from an inner circumferential surface of the body, and arranged to face the first seat portion; and a sealing unit mounted to the body, and formed to contact the first and second seat portions such that a gap between the outer circumferential surface of the disk and the inner circumferential surface of the body is sealed. Under this configuration, the butterfly valve may have an enhanced reliability under low and high temperatures and a high pressure.

Abstract: A lightweight butterfly valve having a disk maintained in a fixed position on a compound shaft through an interlocking relation ship between each of the individual shafts of the compound shaft and the disk as the disk is moveable between an open or closed position with the butterfly valve may having other features such as an electric drive to quickly rotate the compound shaft to provide for rapid opening and closing the butterfly valve, a disk position indicator and a shaft stop to prevent the disk from being driven past a full open condition.

Abstract: Fluid valves having adjustable sealing characteristics are described. An example fluid valve includes a valve body having a flow aperture to enable the flow of fluid therethrough. Additionally, the fluid valve includes a seal surrounding the flow aperture and a sealing member having a shaft extending therefrom. The sealing member is movable relative to the seal and the flow aperture to control the flow of fluid through the flow aperture. Further, the fluid valve includes a support body movably coupled to the valve body and having a passage to receive the shaft. The support body holds the shaft and the sealing member to enable rotation of the shaft and the sealing member relative to the valve body and the seal, and at least one of the support body or the valve body includes at least one elongated opening to enable movement of the support body relative to the valve body to change an amount of engagement between the sealing member and the seal when the fluid valve is in a closed position.

Abstract: A butterfly valve with an undulating sealing surface, which has an inflatable annular seal mounted in a housing. A disk is pivotally mounted in the housing and has an edge with an undulating sealing surface and a peripheral sealing edge. The undulating sealing surface of the disk and a sealing face of the annular seal have non-mating profiles when the valve is in an unsealed condition. Pressure in a chamber proximate the annular seal causes the face of the annular seal to expand and deform and the face forms a high-pressure seal between the sealing ridge and the annular seal. Also includes a method for stopping delivery, of a conduit transportable material through a butterfly valve.

Abstract: A butterfly valve for handling materials where the temperature of the materials flowing through the butterfly valve can exceed the breakdown temperature of the sealing member with the butterfly valve inhibiting contact of hot transportable materials with the sealing member to isolate the hot transportable materials from the sealing member. Cooling conduits maintain at least portions of the valve that contacts the sealing member at a temperature below the breakdown temperature of the sealing member to prevent seal failure.

Abstract: A butterfly valve for forming an enhanced seal between the disk and the annular seal through use of unmated surfaces on the sealing face of the disk and the sealing face of the annular seal.

Abstract: A butterfly valve for handling materials where the temperature of the materials flowing through the butterfly valve can exceed the breakdown temperature of the sealing member with the butterfly valve inhibiting contact of hot transportable materials with the sealing member to isolate the hot transportable materials from the sealing member. Cooling conduits maintain at least portions of the valve that contacts the sealing member at a temperature below the breakdown temperature of the sealing member to prevent seal failure.

Abstract: A butterfly valve with an undulating sealing surface, which has an inflatable annular seal mounted in a housing. A disk is pivotally mounted in the housing and has an edge with an undulating sealing surface and a peripheral sealing edge. The undulating sealing surface of the disk and a sealing face of the annular seal have non-mating profiles when the valve is in an unsealed condition. Pressure in a chamber proximate the annular seal causes the face of the annular seal to expand and deform and the face forms a high-pressure seal between the sealing ridge and the annular seal. Also includes a method for stopping delivery of a conduit transportable material through a butterfly valve.

Abstract: An air intake control apparatus includes a body forming an intake passage for an internal combustion engine, a bore member retained within the body to be movable relative to the body and having a bore being in communication with the body and having an internal peripheral surface forming a portion of the intake passage, at least one shaft body penetrating through the bore member and rotatably provided at the body, at least one valve body fixed to the shaft body so as to adjust an opening degree of the intake passage in the bore member, and a reference portion defining a relative position of the bore member to the shaft body in an axial direction of the shaft body.

Abstract: A reduced component wear valve is comprised of a valve body having a passage therethrough and a disc attached to a rotatable shaft. The disc is utilized with a seal forming a gap between the disc and the seal proximate to the rotational axis of the disc. When the disc is in the open position, the seal major axis is greater then the disc diameter and they do not touch. As the disc rotates to near closure, the disc perimeter engages the minor axis of the seal (which is smaller than the disc diameter), and the disc stretches the seal in the minor axis direction thus decreasing the major axis such that the gap is closed. The seal can be pre-formed in an elliptical shape or it can be formed into an elliptical shape by a retaining mechanism. The seal may be a single-piece or a multi-piece assembly press-fit into the valve body. Zero or light disc to seal contact during the majority of the valve disc rotation minimizes valve seal wear and rotational friction.

Abstract: A valve having a housing with a valve seat for a two-piece flap which is rotatably mounted on a drive shaft. An annular piston seal and an adjacent cover disk are disposed between the first part and the second part of the two-piece flap so as to revolve there-around. The diameter of the cover disk is smaller than the diameter of the annular piston seal which is embodied as a metal ring that is provided with a gap. The invention also relates to the use of said valve as a gas recirculation valve.

Abstract: A reduced component wear valve is comprised of a valve body having a passage therethrough and a disc attached to a rotatable shaft. The disc is utilized with a seal forming a gap between the disc and the seal proximate to the rotational axis of the disc. When the disc is in the open position, the seal major axis is greater then the disc diameter and they do not touch. As the disc rotates to near closure, the disc perimeter engages the minor axis of the seal (which is smaller than the disc diameter), and the disc stretches the seal in the minor axis direction thus decreasing the major axis such that the gap is closed. The seal can be pre-formed in an elliptical shape or it can be formed into an elliptical shape by a retaining mechanism. The seal may be a single-piece or a multi-piece assembly press-fit into the valve body. Zero or light disc to seal contact during the majority of the valve disc rotation minimizes valve seal wear and rotational friction.

Abstract: In a throttle valve actuator unit having a throttle valve neck that contains a pivotable throttle valve and having a drive chamber for receiving an electric drive mechanism for the throttle valve and for receiving an electric connection plug for a plug connection to a control unit, in order to reduce the production costs while maintaining the many customer-specific characteristics, the drive chamber is enclosed by a housing module, and the throttle valve neck is attached as a separate part to the housing module and secured thereto.

Abstract: A flap valve for fuel aggregates, such as fuel cells, comprises a flap arranged within a flow channel. A shaft for pivoting the flap is connected to the flap. Further, a seal disposed in a recess of the channel wall is provided, which comprises at least one pressure pocket connected with the flow channel.

Abstract: The invention relates to a throttle device for controlling a fluid flow in an internal combustion engine, with a multi-part housing, whose first housing part and whose additional housing half rest against each other at contact surfaces and the fluid flow is controlled by means of a flat valve element, which can be adjusted in the flow conduit of the fluid flow by an actuating drive. The throttle device contains at least one sealing and compensation element, whose shaping of its inner wall defines the flow cross section of the fluid flow in the throttle device and which has a contact surface, which can seal cavities on its side oriented toward the housing.

Abstract: The present invention is directed to an exhaust gas control (EGC) valve. The EGC valve comprises a valve housing having at least one inlet port, at least one outlet port, and a flow channel having a centerline extending between the ports. A valve seat is adjacent an opening in the at least one outlet port. The EGC valve further comprises a rotatable actuator shaft offset from the centerline. At least one L-shaped valve armature is operably connected to the actuator shaft. The valve armature has a first leg and a second leg. The first leg is connected to the actuator shaft so that rotation of the actuator shaft in a first direction positions the second leg into sealing engagement with the valve seat to close the flow channel.

Abstract: An engine air control valve assembly includes a valve shaft and a valve plate made from composite polymeric plastics that are formed to be welded together by infrared laser welding. In a preferred embodiment, the valve shaft includes an intermediate portion with a longitudinal open groove along one side. The valve plate is formed with a central raised portion that engages the valve shaft in assembly. A tongue extends inward from the raised portion of the plate and is fitted into the shaft groove after assembly of the shaft into a valve body. The tongue is softened by a laser beam applied to the tongue/groove interface, thereby welding the valve components together in the installed location.

Abstract: The device concerns a device for adjusting the relative distance or position between a check valve and the base on which it rests when it is closed. Said device consists of a valve body (1), a valve shaft (5), a check valve (5) and two bearings (2 and 3) and a base (6). The inner bores of the bearings are offset relative to their external diameter. The adjustment is carried out by appropriately positioning the bearings inside the valve body. The device is particularly designed for rotating butterfly or ball taps and valves.

Abstract: The invention relates to a portable handheld work apparatus having a movable control element (1) for influencing the operation of the work apparatus. The work apparatus includes an actuable positioning element (2) and a Bowden cable (3) connecting the positioning element (2) and the control element (1). The Bowden cable (3) includes a Bowden cable casing (4) and a wire (5) guided in the casing (4) so as to be axially movable. The Bowden cable casing (4) is held at its two ends (6, 7) in support locations (8, 9) with respective longitudinal stops (10, 11). The support locations (8, 9) are fixed with respect to the apparatus. An adjusting device (12) is provided between the ends (6, 7) of the Bowden cable sleeve (4) and the corresponding support locations (8, 9). The adjusting device (12) has a holding element (14) which holds the end (6, 7) and is fixed to the support location. The holding element (14) can be loosened to axially displace the ends (6, 7).

Abstract: A throttle valve for throttling the combustion air flow for an internal combustion engine is disclosed, having a body with a throat, a butterfly in the throat to throttle flow, and a shaft connected to the butterfly to operate it. The shaft has an arm that abuts a throttle stop to maintain the butterfly in an almost-closed (or idle) position. The arm has an opening that permits access to the head of the throttle stop to adjust the throttle stop when the throttle valve is in the almost-closed position. The opening is located so that a tool such as a hex wrench can pass through the opening and engage a socket in the head of the throttle stop, pemitting it to be rotated and adjusted. The throttle shaft and arm are preferably integrally molded of plastic, and the throttle stop head is preferably larger than the threaded shaft of the throttle stop.

Abstract: A damper valve includes a base, a valve blade pivotally mounted on the base and two serially arranged valve seats. Each valve seat comprises adjustable valve seat portions on opposite sides of a pivot axis of the valve blade, the valve seat portions being positioned on opposite sides of the blade. Each valve seat portion includes a stationary member fixed to the base, an adjustable element movable relative to the stationary member, and bolts fixing the adjustable element to the stationary member. Adjustment devices are provided for moving each adjustable element toward the valve element to provide a precise fit along the entire length of the valve seat. The valve seats and the valve blade define an annulus which can contain gas at a higher pressure than the fluid controlled by the valve, so that none of the controlled fluid flows past the valve.

Abstract: A damper system has a rotatable, damper blade pivotally mounted within a damper body. The inner wall of the damper body has a plurality of inwardly, radially extending pins over which is fitted a generally U-shaped sealing channel. The sealing channel comprises two members each of which is held in compression against the inner wall of the damper body by adjustable hold-down blocks.

Abstract: A butterfly valve assembly is disclosed wherein a wedged shaped pin is used to position and fasten the butterfly disc to the valve shaft. The valve shaft, butterfly disc and wedged shaped pin are designed to cooperate in a manner that prevents relative movement between the valve shaft and butterfly disc without the necessity of pre-assembling and drilling the valve shaft and butterfly disc. This allows manufacture and repair without having to maintain the valve shaft and butterfly disc as a matched set. In the preferred embodiment, the butterfly disc has two intersecting apertures, one for insertion of the valve shaft, the other for insertion of a wedged shaped locking pin. The valve shaft is notched such that when it is inserted in the corresponding disc a locking pin with a wedged shaped flat may be inserted through a corresponding disc aperture causing an interference fit between the shaft pin and disc thus locking the disc in position relative to the shaft.

Abstract: A modular butterfly valve for interupting the flow of particulate articles such as tablets, capsules, pills, and the like that includes a disk member which is selectively operable between an open position and a closed position. The disk member is pivotly carried by a pair of tranverse apertures of an elastomer valve seat. The elastomer valve seat also includes an outside diameter, and a seat portion. The seat portion includes a pair of sealing lips that are cantilevered at a selected angle from one end of the elastomer valve seat. The sealing lips form a first throat portion and a second throat portion. In the closed position, a first of the sealing lips abuts one side of the disk member while a second of the sealing lips abuts a peripheral edge of the disk member. The valve seat is retained between a housing and a removable clamping ring. The housing is configured for a quick connect coupling arrangement with a delivery end of a supply bin.

Abstract: A method for adjusting sealing engagement of a valve seat includes providing a valve with a disk in a flow passageway and a valve seal with a seat positioned for sealing engagement with the disk, the valve body and seal together defining a channel having a seal surface lubricated to resist adhesion of the surface and polymeric material, the valve body defining a passage for external access to the channel; injecting liquid polymeric material through the passage into the channel, the polymeric material in the channel pressuring the valve seat toward sealing engagement with the disk; allowing the polymeric material to harden; producing a tunnel through the hardened polymeric material from an external port to the lubricated surface of the seal; and injecting liquid polymeric material under pressure through the tunnel into the channel and causing the liquid polymeric material to flow along the lubricated surface of the seal to collect in selected regions to improve sealing engagement of the seat with the disk.

Abstract: A damper valve includes a base, a valve element pivotally mounted on the base and adjustable valve seat portions on opposite sides of a pivot axis, the valve seat portions being positioned on opposite sides of the blade. Each valve seat portion includes a stationary member fixed to the base, an adjustable element movable relative to the stationary member, and bolts fixing the adjustable element to the stationary member. In addition, adjustment devices are provided for moving the adjustable element toward the valve element to provide a precise fit along the entire length of the valve seat.

Abstract: A butterfly valve comprising a valve body, a throttle plate located within a throat of the valve body, and opposed projecting pins connected to the throttle plate and extending into two opposed bores of the valve body. At least one pin has an annular bearing surface. A spring urges either a thrust bearing against a needle bearing which in turn bears against the annular bearing surface or a needle bearing against the thrust bearing to bear against the annular bearing surface. This urges the throttle plate against an opposed thrust bearing which bears against the opposed projecting pin connected to the throttle plate to center the throttle plate within the throat of the valve body. A set screw can be provided to accurately position the throttle plate within the throat of the valve body. Preferably the throttle plate has tapered end sections to diminish turbulence within the valve throat.

Abstract: A disc valve with a disc that is pivotable between open and closed positions has a metallic seal ring placed against an axially-oriented face formed by the housing and located at the ends of an enlarged conduit portion between the face and one of the ends of the housing. A three-part retainer ring which includes a main body located opposite the seal ring and a flange which extends radially outward from the main body and snugly fits into a groove in the housing is defined by at least three retainer ring segments. At least one of the retainer ring segments includes parallel ends which are opposite correspondingly parallel ends formed by the adjoining retainer ring segments so that this one segment can be radially moved past the other segments.

Abstract: An air seal valve comprises an annular valve body having a circular valve plate disposed internally thereof with a pair of axially spaced valves thereon defining a fresh air plenum, one of said valves comprising a truncated conical plate having a radially outer edge engageable with the valve body to effect a seal thereagainst.

Abstract: A butterfly valve seat structure has a polymeric sealing head slidably supported on the radially inner portion of a flat metal washer so as to be capable of radial sliding movement on the washer, a radially outer portion of the washer being rigidly clamped between the valve housing and the seat retaining ring, and a radially intermediate portion of the washer is capable of axial movement relative to the axis of the valve passage to facilitate axial movement of the sealing head. Axial projections on the head serve to resist any tendency to blow-out of the sealing head. The combined abilities of the sealing head to move axially and radially help to provide a good sealing action against the valve disc.

Abstract: Improved techniques are provided for adjusting the axial position of a rotatable valve closure element carrying an elastomeric annular seal with respect to a metallic valve body. An adjustable nut is threaded to the valve body and includes a recess for receiving a lower stem of the valve closure member. One or more interference members are spaced radially between the nut and the lower stem, and permit axial movement of the lower stem and thus the annular seals with respect to the valve body, while enabling the valve closure member to freely rotate during normal use of the valve.

Abstract: Fluid flow diverter apparatus is described for reversing the direction of fluid flow through a process loop, such as a bundle of heat exchange tubes in an air conditioning system. The apparatus utilizes a housing enclosing a rotary valve in which the diverter disk seats in two positions against generally U-shape seating frames that can be repositioned to compensate for erosion or other distortion of the seating surfaces on the frames and disk. The seating frames comprise a plurality of seating bars, each of which is adjustably fastened to the interior of the valve casing by at least one threaded fastener that extends through a transverse slot in the bar and engages the casing. All seating surfaces preferably are coated with a resilient material, such as rubber.

Abstract: A pivotally adjustable valve disc has a ring seal set in its grooved periphery for contact with a wall of a valve accomodating bore. A flexible, radially expansible member is in the valve groove in a backing relation to the ring seal. Passages admit pressure fluid from the upstream side of the valve disc to the valve groove where the applied pressure is exerted through the radially expansible member toward a radial expansion of the ring seal. In its pressured contact with the seal, the radially expansible member blocks pressure fluid escape through gaps and interfacial joints therein.

Abstract: A bidirectional valve useful at all temperatures from cryogenic to extreme fire temperatures. The sealing means for the bidirectional valve comprises a metallic sealing element having a pair of spaced sealing lobes defined thereon which are coated with a Teflon compound. A third sealing lobe is defined on the metallic sealing element between the pair of sealing lobes and is constructed solely of metal. A pair of coated sealing lobes further function as wipers to prevent sand, dirt or similar foreign particles from becoming crushed between the valve disc and metallic sealing lobe during the final closing of the valve. When the valve is exposed to fire conditions, the Teflon coated sealing lobes melt out leaving the metallic lobe as the fire safe sealing lobe.

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: The butterfly valve comprises a valve body traversed by a passageway and a closure element or butterfly valve disk placed transversely with respect to the passageway. An annular bearing surface of the valve disk is intended to bear on a valve seat placed within the passageway. The valve body is constituted by an annular member provided with a chimney in which an operating shaft is mounted. The annular member is supported in leak-tight manner by a bearing ring having a greater thickness in the radial direction than the wall of the annular member. The bearing ring is inserted between the two end portions of the piping system and forms part of the valve body under operational conditions.

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: This invention concerns a butterfly valve having a resilient, adjustable seat for pivoting disc. The seat comprises an elastomeric seating attached to a clamping ring which slides along the walls of the first portion of the flow passage extending through the body. A plurality of actuators extend through the clamping ring and seat ring into an axial annular wall to initially compress the seat ring. The flow passage is configured so that the axial wall of the clamping ring is uniformly exposed to the fluid pressure in the first passage portion.

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: The actuator shaft of a butterfly valve rotates 90 degrees to open or close an associated flow interrupter. As the shaft rotates its 90-degree motion is imparted to associated link members and the flow interrupters that are operably connected to the shaft. Thus, a drive link, secondary shaft and vane, as well as the support trunnions, are rotated simultaneously. This arrangement permits the seating of the seal on an axis which coincides with the axis of the actuator shaft and the sealing effected is bidirectional.

Abstract: A butterfly valve comprising a valve body mounted on a valve stem in a valve housing. The valve housing is provided with valve seats to contact the periphery of the valve body when the valve is closed. Elastic seal members are disposed between the end surfaces of the valve seats and the valve stem in a manner to surround the latter. The butterfly valve of the invention further comprises tubular holder members rotatable relative to the valve stem and fitted with the elastic seal members on outer parts thereof.

Abstract: A butterfly valve having a split sealing ring in a groove in the interior of the passageway therethrough, the sealing ring having mating ends of a tongue and groove construction or the like.

Abstract: This invention concerns a butterfly valve having a resilient, adjustable body seat for the pivoting disc. The seat comprises a T-shaped elastomeric ring which is confined at one end by the transverse wall of an annular groove in the valve body and that another end by a clamping ring which slides along the wall of the flow passage extending through the body. The clamping ring is forced against the seat ring by a plurality of individual screw actuators spaced around its circumference and therefore selected portions of the seat ring can be compressed as needed to produce a leak-free seal around the entire periphery of the pivoting disc. The T-shaped elastomeric ring is held in place solely by mechanical forces in order to permit removal, maintenance, and replacement thereof.