Abstract: In a fire-safe butterfly valve a polymeric seat ring is resiliently biassed by a resilient metal energizer ring to hold the polymeric seat ring engaged with the closed valve disc, and an independent metal sealing ring permanently engages with the closed valve disc.

Abstract: A seal mechanism for butterfly valve of concentric opening with press contacting seal, which comprises a ring-formed seal metal arranged surrounding the valve body under insertion in a radially displaceable manner in a circumferential groove formed around the circumference of the valve body, said seal metal having a rounded outer peripheral face; a seal metal disposed surrounding the inner wall of the valve casing and formed integrally therewith, with its seat face inclining relative to the conduit direction of the valve casing; and two tubular buffer rings inserted in said groove of the valve body in between the bottom of the groove and the inner circumference of the seat metal, each of said tubular buffer rings being split along its entire looping length on the upper or lower side of the ring so as to leave a C-shaped cross section to thereby provide a resilient support for said seal metal on said groove bottom at the neutral position on the seat face between the thrust force components in the inflow and th

Abstract: A seal system for butterfly valves of concentric- or eccentric valve body closure, which comprises a circumferential receptacle groove formed around the circumference of the valve body; a seal metal extending over the circumference of the valve body and having curved outer ridge face, arranged inserted in said receptacle groove on the circumference of valve body so as to permit its radial displacement; a stripe of seat metal suitable for receiving said curved outer face of said seal metal upon closure of the butterfly valve to effect a fluid tight seal, said seat metal protruding from the casing inner face with its front face inclining relative to the axis of the valve casing to permit a tight fit thereof with said outer ridge of said seal metal, wherein a buffer ring having a sectional form permitting a resilient deformation, such as a C-shape, is inserted in said circumferential receptacle groove of valve body between the groove bottom and said seal metal in order to effect a resilient support of said seal

Abstract: The present invention comprises a transport system having an annular inflatable seal which has an annular interior domed portion which expands as an integral unit until it contacts the edge of a butterfly valve which engages the domed portion to form a slight recess in the annular seal which provides an airtight and locking seal with the annular seal having a pair of annular resilient legs operable to return the annular interior domed portion to its original position to permit the butterfly valve to be opened.

Abstract: A high performance butterfly valve utilizing a thin sheet metal annulus to provide sealing between a valve casing and a rotary disc type valving member. The design of the sealing element provides for a self-sealing at all pressures, with augmentation of the sealing action as a result of applied pressure differential. As maximum stresses in the thin metal sealing element are approached, the element becomes supported at an intermediate region, enabling effective performance at both low and high pressure limits.

Abstract: The disclosure is directed to a high performance butterfly control valve which may be applied and utilized in critical high pressure and/or high performance operation environments. In accordance with the invention, the vane of the butterfly valve is formed to include first and second diametrically opposed, asymmetrical projections, each extending from the periphery of the vane and each including a plurality of fluid control passages formed therethrough. The projection adjacent the downstream rotated periphery of the vane is formed to a generally smooth, streamlined configuration to minimize the overall volume of the vane, and to facilitate a smooth, turbulence free flow when the valve is in the full open position. Moreover, the projection adjacent the upstream rotated periphery of the vane is formed to a length of extension which is greater than the length of extension of the diametrically opposed projection.

Abstract: The disclosure is directed to a high performance, leak tight seal for use primarily in butterfly control valves. In accordance with a significant feature of the invention, the seal is arranged and configured whereby fluid pressure within the butterfly valve environment is retained by the seal through three clearly defined, discrete pressure range operating stages. The seal is mounted within a seal containment chamber formed in the valve housing. The fluid pressure inherently and automatically orients the seal relative to the seal containment chamber to provide a seal geometry, containment chamber support, stress distribution and seal deflection which is optimum for the pressure range of the particular operating mode.

Abstract: A gasket for a rotary gate valve is made from a material that can be utilized only after sintering, such as a fluorocarbon polymer, and comprises a ring-shaped solid portion 15 surrounded by a coaxial, annular flange 16 for anchoring the gasket within the valve body. A closed chamber 23 is provided in the solid portion of the gasket and houses an elastic ring 28. In manufacturing the gasket an annular ring is formed comprising the solid portion 15, an axial groove 23, an axial tab 29, and a radial tab 30. The elastic ring 28 is then inserted in the axial groove, and the tabs 29 and 30 are pressed together to form the annular flange 16 and fully enclose the ring 28.

Abstract: The invention relates to a sealing device for such throttle valves as comprise a valve housing with a valve seat and a pivotally mounted throttle member which may be pressed against the valve seat to bring about a sealing contact between two interacting sealing surfaces, one on the throttle member and the other in the valve housing and a sealing ring to be mounted in a slot in the valve. The invention is characterized in that the sealing ring (5) has a cross-section of a homogeneous, radially elongated body part (8) of considerable rigidity and resistance to radial deformation, that said body part at its head end (11) has a sealing surface (12) which is one of the two said sealing surfaces, and that from the "hip" part of the said homogeneous body part extend two essentially radial legs (14, 15), which form flanges of the sealing ring, said flanges being arrnaged to be pressed axially against the walls (18, 19) of said slot.

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 butterfly valve for use with corrosive fluids is constructed of fiberglass-reinforced plastic (FRP). The valve blade is mounted in the valve body on a shaft comprising a continuous strand fiberglass-reinforced plastic rod secured in a sleeve. Exposed end portions of the rod are coated with plastic resin and machined for journaling in the valve body. An FRP sealing layer coats the sleeve and adjacent portion. A pressurizeable O-ring seal surrounds the passageway of the valve body for sealing against the periphery of the blade. The periphery of the blade is rounded and sized so that the O-ring cups the periphery of the blade when closed. The valve body is formed in two tubular sections which are connected together during assembly of the valve. The end faces of the two sections are oppositely beveled to jointly form an inverted V-shaped channel for the O-ring seal. The beveled end faces provide acutely angled edges tangentially contacting the sides of the O-ring along the inner surface of the valve body.

Abstract: There is disclosed a novel sealing member and arrangement for a valve of the type including a valve body having a fluid passage therethrough and a flow control member movably supported relative to the body for opening and closing the flow passage, such as found in a ball or butterfly type of valve constructions. The valve body and flow control member include, respectively, an annular sealing surface and an annular sealing member support groove or channel confronting the sealing surface and having an annular sealing member disposed therein. The sealing member includes an anchoring portion held between opposed sidewalls of the support groove, and a convoluted portion extending radially inwardly of the anchoring portion, with a sealing portion carried thereby, and designed to extend beyond the groove, for engagement with the sealing surface. The groove sidewalls are of slightly greater axial width than the sealing member to permit limited elastic axial deflection.

Abstract: Butterfly valve comprising a valve housing and a flap and two soft sealing rings retained by undercut grooves in the valve housing and from said grooves radially inwardly projecting sealing lips for engagement with the sealing surface of the flap. By means of the two soft sealing rings which are separated by a flexible intermediate ring (18) of metal, the radial inner edge thereof is formed with two opposite directed sealing lips, a complete fluid sealing in both pressure directions is obtained. In the event of destruction of the soft sealing rings caused by eventual fire in the valve, the pressure of the fluid will result in deformation or flexing of the intermediate ring, so that the one or the other of the sealing lips is pressed against the sealing surface of the flap and, thereby obtaining a fire proof seal in both directions.

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 seating assembly for use in a rotary valve comprising a metallic seat ring having a radially inner metallic sealing section and a polymeric seat ring having a polymeric sealing section for sealing engagement with a valve element, each of said rings having a radially outer retaining section for mounting the respective rings in a valve body, both of said rings having an intermediate spacer section interconnecting the radially inner sealing and radially outer retaining sections. The spacer sections have convoluted runs forming interlocking formations to prevent relative radial movement of the seat rings, and there are a multiplicity of circumferential windings of strands in surrounding relation to the metallic sealing section.

Abstract: A fire-safe butterfly valve (FIG. 2) provides bi-directional sealing. In normal duties a polymeric seal provides forward and reverse sealing against the edge of the valve disc, the polymeric seal being resiliently loaded in the axial direction of the valve by a resilient metal ring. The metal ring provides a bi-directional seal with the disc edge in the event of destruction of the polymeric seal by fire. The metal ring in transverse cross-section consists of an arm having a curved radially inner end presenting a convex surface for engagement with the disc edge. For fluid pressure acting from the smaller diameter side of the disc, in the burnt out condition, the curvature of the radially inner end of the metal ring gives rise to an increased sealing force with the disc edge as the disc moves in response to the fluid pressure and the ring inner end remains in rolling contact with the disc edge.

Abstract: Disclosed is a flexible sealing ring for a valve having a generally S-shaped cross-section and an extension from one end of that S-shape. The extension is mounted on the valve body and serves as a cantilever means for the sealing ring which is thus sealingly engagable with the peripheral sealing surface of a movable valve member pivotally positioned within the valve passageway. The sealing ring is formed from materials capable of withstanding high temperatures (1000.degree. F.) for sustained periods without impairment of its' sealing capacity. The sealing ring may be used in cooperative combination with other sealing rings, including heat destructible materials such as "Teflon", to form valve seal means effective over a range of temperatures and pressures, including firesafe valve seal means.

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 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 butterfly valve having a valve body and a valve disc which is selectively rotated to produce a fluid-tight engagement of a peripheral edge of the disc with an annular seal or wall defined by a portion of an internal fluid passage in the valve body uses an annular fluid pressure seal member mounted in an annular groove in the valve body adjacent to the annular seat. The seal member is a layered structure including a pair of coaxial metallic annular seal rings having aligned J-shaped inner sides arranged in a facing relationship and a resilient annular seal ring captured between the metallic rings and having a sealing surface aligned with an outside surface of the J-shaped sides. The sealing surface of the resilient seal ring and an outside surface of the J-shaped sides are arranged to produce the fluid-tight engagement with the peripheral edge of the valve disc.

Abstract: A valve seal for a cryogenic butterfly valve comprising a reclining U-shaped resilient seal with the annular edge of the longer radially outer leg being gripped in the valve body to form a static seal. Pressure in one direction acts around the outer surface of the seal to pivot it about the static seal against the valve disc. Pressure in the other direction acts between the legs of the seal ring and, because the seal is restrained by the valve body against pivoting away from the valve disc, the pressure separates the legs to bias the radially inner leg inwardly against the valve disc.

Abstract: This disclosure relates to the construction of butterfly valves of the type used for controlling fluid flow and, more particularly, to a seal for use in sealing the periphery of the closure member of such valves. Further, the seal disclosed herein is loaded by the pressure of the fluid being handled, to enhance the tightness of the seal.

Abstract: A butterfly valve is disposed in a valve body for sealing engagement with a resilient seat ring disposed in a tapered groove defined by the valve body and a retaining ring. A metallic back-up ring is disposed between two legs of the seat ring to support a sealing portion thereof when the valve is closed. Flanges on the legs retain the seat ring together with the backup ring in the groove. Parallel walls at the bottom of the groove insure seat ring and back-up ring retention. An "O" ring is disposed between the back-up ring, the flanges and the groove bottom and pressurized fluid passageways are provided to produce a two-way pressure assist for sealing.

Abstract: A butterfly valve having a valve body and a valve disc which is rotated to produce an engagement with a peripheral edge of the disc and an annular seat or wall defined by a portion of an internal fluid passage in the valve body uses a seal ring member mounted in an annular groove in the valve body adjacent to the annular seat. The seal ring member includes a pair of bowed seal rings arranged in a "V" within a triangular shaped annular recess in the wall of the fluid passage in the valve body. One side, i.e., an inner side, of each of the seal rings projects from the triangular recess to contact the edge of the valve disc to form a fluid-tight seal in response to fluid pressure acting on a convex face of a seal ring to flatten the seal ring. The other side of each of the seal rings contacts a respective corner of the recess with the convex faces of the seal rings facing each other.

Abstract: Disclosed is a butterfly valve having a seat, when viewed in cross-section, of generally U-shaped configuration, and an insert configured with appropriately shaped cooperating surfaces. The sealing effectiveness of the valve is enhanced by line pressure regardless of the direction of application of such pressure, the torque characteristics of the valve are relatively low, the ability to withstand temperature cycles is good, and the seat is restrained from destructive interference with the disc.

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 seal for closing a gap which is present between a tubular housing member and a plate-shaped closing member pivotally mounted within the housing member in the closing position of the closing member includes two resilient sealing lips which, even when unstressed, assume substantially symmetrical curved configurations; when the closing member assumes its closing position, the sealing lips, which have an effective width exceeding that of the gap and which are detachably mounted on the housing member, are stressed and press against the closing member to seal the gap against penetration of media therethrough in either direction. The sealing lips surround the closure in an annular manner and are made of a metallic material.

Abstract: An expansible device for exerting force which has a generally "S" shape cross-section, being formed by stepped diameter cylinder, and arrangements using such a device are disclosed. The device may exert sealing forces and be controlled by admission of fluid pressure which acts on a thin wall member so supported as to be subjected to compressive stress alone.

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 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 fire-safe sealing device for a valve including a valve body defining a fluid passage and an inner valve positioned in said fluid passage to open or close the fluid flow therethrough. The device comprises an annular groove formed around the fluid passage, a seat packing made of synthetic resin mounted in said annular groove, and a metallic annular elastic member arranged to contact with one side of said seat packing and the seating surface of the inner valve. The metallic elastic member acts to promote the sealing action of the seat packing and also acts to hold the leakage of the fluid to the minimum when the seat packing has been lost by a fire.

Abstract: A sealing structure capable of various uses and particularly in butterfly valves having a body with a flow passage and a movable valve disc in the flow passage and having a sealing surface. The sealing structure is mounted in the body to engage the disc in the closed position of the latter to provide a high performance (i.e. bubble-tight) seal. The sealing structure includes an annular seal retaining cavity with a slot opening to the flow passage. The structure includes a seal ring of Teflon, PFA or the like retained in the cavity and sealing one axial side of the ring from the other. It also has a tongue-like extension projecting through the slot into the passage and having a seat at its end engageable with the sealing surface of the disc. The seal and cavity structures have shoulders normally (in open position of the valve) abutting each other to seal the interior of the cavity (the abutment occurring from expansion of the seal ring into place in the cavity).

Abstract: A sealing device for a valve which includes a valve body having a fluid passage and an inner valve for opening or closing said fluid passage, said sealing device comprising a seat packing disposed in a peripheral groove formed in the valve body and partly projecting therefrom into the fluid passage, said seat packing being so constructed that the durability and the fluid shut-off performance are promoted by the combined effect of the fluid pressure in the fluid passage acting against said seat packing and the elastic force of a metallic annular elastic member associated with said seat packing.

Abstract: A butterfly valve for use in the control of gaseous fluids which comprises a valve disc having an annular sealing surface near its periphery, a flat annular valve seat provided in a housing accommodating the valve, and an actuating means for opening and closing the valve by bringing the valve disc sealing surface and the valve seat into cooperation, said valve seat containing an elastic sealing means which is adapted to be pressed against the sealing surface of the valve disc to enable a leakage-free closure of the valve.

Abstract: In a butterfly valve, comprising a valve disk pivotally mounted for movement between a closed position, in which the disk prevents the passage of fluid along a passageway, and an open position, in which the passage of fluid is allowed, an annular seal is provided to seal between the periphery of the disk and the wall of the passageway, provided by a valve housing, when the disk is in its closed position. The seal comprises two deformable sealing members, of P.C.T.F.E., mounted to seal against fluid flow in either direction along the passageway. A rigid former or rigid support ring is mounted between the sealing members to provide support therefor, and to act as a back-up seal in case fire should destroy the primary sealing members. In order that the former can be effective as a seal, it is clamped between the valve housing and a clamping ring independently of the fire-destructible primary sealing members.

Abstract: An annular valve seat having a resilient metal seal for use in a variety of types of valves provides positive control of fluid flow, with effective metal-to-metal sealing, long life and easy replacement of the seal. The metal seal is in the form of an annular ring comprising approximately one-quarter of a torus that cooperates with the valve's flow control element to establish a metal-to-metal fluid seal which is especially useful at relatively high temperatures. A first edge portion of the torus is held in position against a radial surface of the valve's body by a retainer ring which centers the torus about the flow control element. When the valve is closed the flow control element presses against the outside portion of the resilient metal torus forcing the free edge of the torus against a portion of the retainer ring so that the seal is loaded as a structural span supported at the ends by the valve's body and the retainer ring.

Abstract: Disclosed herein are valve seals wherein an annular metallic seal member is retained in an annular recess in a valve body wall, the seal member being resiliently deformable in both axial and radial directions. A resilient annular Belleville spring portion is provided linking an inner sealing portion and an outer flange portion which is sealingly engaged by the valve body. When a valve employing this seal arrangement is closed, differential pressure acting from either direction urges a valve closure member and the seal member in a downstream direction, and forces the seal member and the valve closure member into tighter sealing engagement.

Abstract: A pressure actuated seat ring for a disc valve has a tubular, relatively flexible portion extending axially from a radially thicker, relatively inflexible portion. The flexible portion of the seat ring extends circumferentially about the disc of the valve when the valve is closed and a cavity is formed about the flexible portion such that fluid pressure in the cavity tends to force the flexible portion of the seat ring against the disc. The ends of the cavity are vented to the flow passage of the valve at opposite sides of the disc and an elastomeric sealing ring mounted on the tubular portion of the seat ring is movable within the cavity in response to a pressure differential at the vents to seal the vent exposed to the lower pressure so that the larger pressure is transmitted to the cavity.

Abstract: Disclosed is a fire-tested butterfly valve having a resilient flexible seat member held in place in a valve housing by being clamped between cooperating surfaces of the valve housing and a valve seat retaining ring insert. Also positioned between the housing and the insert is a fusible washer means which has a lower destruction temperature than that of the annular flexible seat. Further, the insert is spring biased toward the fusible washer and valve housing so that when the valve is exposed to fire the fusible washer melts, the insert is biased toward the housing, and as the annular flexible seat is destroyed by heat, an edge of the insert into contact with the butterfly disc to establish a secondary, metal-to-metal, fire resistant seal.

Abstract: In this butterfly valve structure having an elastic sleeve, an outer projection of the sleeve in the free state has the same sectional shape as a groove in the body of the valve. The radial thickness of the seat is at least equal to ten times the depth to which the valve member, when closed, penetrates into the seat. The depth of the groove is at least equal to 4/10 of the minimum radial thickness of the seat. The axial length of the bottom of the groove is of the same order of magnitude as that of the seat. The corners of the groove are rounded. This valve structure is of particular advantage for high temperature and/or when the valve member remains closed for a prolonged period.

Abstract: Disclosed is a butterfly valve comprising sealing means for a movable valve member in the form of a resilient high temperature destructible sealing ring and a resilient high temperature indestructible seating ring, both of which are normally preloaded into radial sealing engagement with the movable valve member. The high temperature destructible seating ring is the primary seal and the high temperature indestructible seating ring being a backup seal in one direction of flow and the high temperature indestructible seating ring is the primary seal in the opposite direction of flow. Upon destruction of the high temperature destructible seating ring, the high temperature indestructible seating ring is so retained and configured to provide bidirectional seating.

Abstract: A valve comprising a closure member including an annular peripheral sealing surface, a supporting shaft fixedly secured to opposing sides of the closure member, a housing including a cylindrical flow passage and means for rotatably supporting the closure member supporting shaft, means for rotating the closure member from a first position, whereat the flow passage is open, to a second position, whereat the flow passage is closed, an annular valve seat including an annular sealing surface, the housing further including an annular valve seat receiving channel selectively configured to support the annular valve seat for mating engagement with the closure member sealing surface when the closure member is at the closed position and the valve seat is at the neutral or zero pressure position, the valve seat including a recessed portion on one side thereof with a first annular groove extending axially into the valve seat from the recessed portion and a second annular groove extending axially into the other side of the

Abstract: Disclosed is a fire-tested butterfly valve having an annular resilient seat member and an annular, flexible metal seat member, both held in place in a valve housing by being clamped between cooperating surfaces of the valve housing and a valve seat retaining ring insert. In a first embodiment, a fusible washer with a lower destruction temperature than that of the annular resilient seat is positioned between the resilient seat and the metal seat. In a second embodiment, an integrally formed protrusion on the annular resilient seat contacts the metal seat. In both embodiments, the metal seat is held out of contact with the butterfly disc until exposure to a fire melts the fusible washer or the seat protrusion, at which time the metal seat comes into contact with the disc to establish a secondary, metal-to-metal, fire resistant seal.

Abstract: A sealing device is provided for use in a butterfly valve, ball valve or the like wherein a seal ring is provided which forms a seal in co-operation with a rotating valve member, in which the seal is held in position by an annular pressure member which is impelled towards the body of the valve by springs, and whose inner periphery is adapted to form an emergency seal in co-operation with the valve member, should the seal itself be damaged or destroyed by fire.

Abstract: A bidirectional butterfly valve comprising sealing means for a movable valve member in the form of a seating ring and retaining means therefor cooperatively configured to maintain bidirectional axial sealing engagement with the retaining means and radial sealing engagement with the movable valve member at normally encountered or cryogenic temperatures.

Abstract: A disc valve includes a seat ring having a butt portion anchored to the body of the valve and a seal portion which extends axially from the butt portion. The disc of the valve is axially aligned with the seal portion of the seat ring so that the valve is sealed via engagement of the seal portion with the periphery of the disc. An annular cavity is formed about the seal portion of the seat ring and opposite ends of the cavity are vented to the valve chamber on opposite sides of the disc. An elastomeric seal disposed in the cavity is responsive to pressures of opposite ends of the cavity to close the vent to the low pressure side of the disc such that the higher of the fluid pressures on opposite sides of the disc is exerted on the outer periphery of the seal portion of the seat ring to foce the seal portion against the disc when the valve is closed.

Abstract: A valve comprising a substantially cylindrical housing, a substantially annular cylindrical resilient valve seating member in said housing, said seating member having an inner surface and an outer surface, a butterfly valve having an outer periphery, a shaft extending through the housing and the seating member for mounting the butterfly valve for movement between a first position wherein its outer periphery is in engagement with the inner surface of the seating member and an open position wherein the outer periphery of the butterfly valve is spaced from the inner surface, a plurality of ribs on the outer surface of the valve seating member for bearing against the inner surface of the housing, chambers between the ribs, a plurality of openings in the valve seating member upstream of the butterfly valve for permitting pressurized fluid to enter the chambers to thereby tend to move the resilient valve seating member radially inwardly into engagement with the outer periphery of the butterfly valve when the latter

Abstract: A butterfly valve assembly is disclosed having a resilient seat to compensate for wear. The valve has a rigid body with opposing end surfaces adapted to mate with opposing flanges. The body has opposing internal end surfaces spaced inwards from and having a smaller diameter than the external parallel end surfaces, a flexible ring within the annular body is adapted to deform under uneven stresses but to return to its original shape when the stresses are released. An annular seat of elastomeric material supports the flexible ring in a flexible relationship within the body to form a seat assembly leaving an annular space beteeen an external surface of the seat assembly and an internal surface of the body. The seat assembly has two external flanges, one at each end which overlap the internal end surfaces and are adapted to be clamped between the internal end surfaces and the opposing flanges.

Abstract: A rotary valve for providing control of fluid flow throughout a wide range of pressures and temperatures. The valve includes a pressure-sensitive and temperature-responsive flexible annular seat that cooperates with the valve's flow control element to establish a fluid seal, and a temperature-responsive rigid energizer ring for maintaining both a radial and an axial load on the seat through a wide range of ambient and low temperatures. The valve seat includes an annular, radially outward extending support leg that is held in position against a radial surface of the valve's body by the energizer ring, at least one outer annular sealing lip that extends in a generally axial direction from the leg, and a central sealing lip that extends radially inwardly from the support leg toward the flow control element.