Abstract: A flexible double toric sealing ring comprising two toric sealing ring structures 2, 3 which ensure, respectively, a static seal and a dynamic seal. A counter ring is mounted radially on the second sealing ring structure and floats with it to allow self centering of the arrangement with respect to the valve seat. A sealing membrane 8 presents an elastically deformable structure 12 interconnecting the two sealing ring structures 2 and 3 while partially covering them. The two sealing ring structures 2, 3 are mounted on opposite sides of the middle section 11 of membrane 8. This double toric sealing ring can be advantageously applied to a butterfly valve.

Abstract: A butterfly valve comprises a closure member 8 having a warped curve periphery pivotably disposed within a tubular body 1. An elastic seal and a cooperating seat are provided on the closure member and tubular body, respectively, or vice versa. At each point of a mean line of seat, a plane T tangent to the seat forms a roughly constant acute angle x of 20.degree. to 30.degree. with a tangent t to the path of the corresponding point of the closure member at the point of contact of the seal and seat.

Abstract: A seat ring for a rotary valve assembly comprising a radially inner seal section for sealing engagement with a valve element, a radially outer retaining section for mounting the seat ring in a valve body, and an intermediate spacer section interconnecting the sealing and retaining sections. The spacer section has a convoluted radial run, and the sealing section has a multiplicity of circumferential windings of strands in surrounding relation thereto.

Abstract: A butterfly valve disk is rotatably mounted within a passageway formed in the valve body and an annular seal fitted in the valve body projects within the passageway. A peripheral annular bearing surface formed on the valve disk is applied against the annular seal in the closed position. The valve disk carries a stop which is brought to bear on an internal surface of the valve in order to prevent rotational displacement of the valve disk beyond its normal position of closure.

Abstract: A device for rotatably mounting a shutter in a piping of an air-conditioning installation of an automotive vehicle, wherein the wall of the piping comprises bearings cooperating with cylindrical end-pieces of the shutter and cylindrical projections surrounding the bearings and cooperating with tubular sealing lips of the shutter.

Abstract: The invention relates to an improvement to valves with lenticular or spherical closing member mounted for pivoting in a valve body with interposition of a circular tight seal.Downstream of the closing member, the valve body is provided with a bore inside which is removably mounted an annular member against which rests the tight seal, and which has a spherical part adopting the corresponding shape of the closing member, the said annular member comprising vent-holes.The invention finds a useful application in the production of valves.

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: An improved O-ring groove for a sealing member, the groove being formed in the sealing surface of the member, the groove in cross-section having an outer portion communicating with the sealing surfaces and an inner portion, the inner portion being of width greater than the outer portion, the juncture of the inner and outer portions providing opposed ledge surfaces, the cross-sectional area of the groove inner portion being greater than that of the outer portion and a gasket preferably in the form of an O-ring received in the groove substantially filling the groove inner and outer portions and normally extending slightly beyond the sealing surface.

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 large, high temperature, cost-effective butterfly valve with provisions for simple internal inspection and repair through a transverse access opening that is substantially smaller than the valve seat opening and which is repairable without necessitating removal of the valve body from the pipeline. A plurality of closure members that span the width of the valve seat opening are positionable in compact manner for removal through the small transverse access opening. A substantially annular seat is defined within the valve by a plurality of seat segments that are disposed in supporting and supported slip joint relation, thus permitting substantial radial expansion and contraction of the valve body without subjecting the valve seat structure to circumferential stresses.

Abstract: A fire safe disc valve comprising a valve body having a flow passageway therethrough, a disc shaft rotatably mounted in the flow passageway and a disc mounted on the disc shaft, the disc being rotatable to and from a position normally closing the flow passageway by sealingly engaging a disc sealing member. An operating stem, extending through a stem operating aperture in the valve body, engages the disc shaft for rotation thereof, and an elastomeric packer seals the aperture about the operating stem. The disc shaft is displaceable along the flow passageway whereby the disc will close the passageway if the disc sealing member is destroyed, and the operating stem is axially displaceable in the stem operating aperture whereby the aperture is sealed by fluid pressure pressing the operating stem against a stem sealing seat if the stem packer is destroyed.

Abstract: A flow control valve with a valve closure element is provided having at least one annular resilient seat member and an annular flexible metal seat member positioned adjacent to it. The flexible metal seat is held in position by heat resistant gaskets and is biased against the resilient seat member. Upon the failure of the resilient seat to seal because of melting or deterioration caused by exposure to heat, the flexible metal seat member springs into position to provide a fire and heat resistant metal-to-metal seal with the valve closure element.

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 includes a gasket on the pivotable member which has a peripheral ring portion and two end rings which are concentric to the shaft supporting the pivotable member, each end ring having a flange held under spring pressure between the pivotable member and bushings on the shaft ends. The gasket thus seals the valve against leakage to the outside and to the shaft.

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 molded polyethylene valve body has a conduit portion and an annular portion extending upwardly from the conduit portion. A passageway extends through the conduit portion for the conveyance of fluid. A valve seat is formed in the conduit portion by a metal sleeve that is molded in the valve body to prevent separation of the sleeve from the valve body during sustained pressures. O-rings positioned in grooves around the metal sleeve are compressed by the plastic material during the molding process to effect a seal between the sleeve and the plastic valve body. An annular rubber sleeve insert is vulcanized onto the inner diameter portion of the metal sleeve. A plastic valve disc is centrally positioned in the conduit portion within the periphery of the rubber sleeve insert and is arranged to sealingly engage the rubber sleeve insert when the valve is moved to the closed position. A metal stem extends through the annular portion of the valve body and is connected to the valve disc.

Abstract: An induction system for a multi-cylinder internal combustion engine that improves fuel efficiency and reduces the emission of unwanted exhaust gas constituents, particularly at the low and medium load conditions. The engine induction system comprises a plurality of separate carburetor barrels which, at least under some running conditions, serve cylinders separately from each other through main induction passages. One carburetor barrel is provided with a different fuel discharge system than the other carburetor barrels for accommodating a certain engine operating condition. A separate sub-intake system connects this carburetor barrel with other cylinders not normally served by the particular carburetor barrel in question. This sub-intake system has a substantially smaller cross-sectional area in the main intake system so that the charge drawn into the cylinders through the sub-intake system enters at a substantially higher velocity.

Abstract: A fire-safe rotary valve seat assembly for use in pressurized fluid systems subject to fire risk, the seat assembly having both a metal seat ring and an annular resilient non-metallic seal member to provide essentially zero fluid leakage at normal operating temperatures, and the metal seat ring to provide an extremely low rate of fluid leakage in the event high temperature should destroy the flexible seal member. The metal seat ring includes an annular groove around its radially inward face with a pair of flexible lips forming the walls of the groove, and the annular resilient seal member is mounted in the groove between the lips. The lips and the annular resilient seal member both engage a sealing surface on the circumference of a metal valve disc to provide a primary seal for the valve. If the annular resilient seal member is destroyed, the metal lips continue to provide an undamaged secondary seal.

Abstract: A butterfly valve is disclosed for use in controlling the flow of gaseous fluid under high temperature, high pressure conditions. The interior of the valve body has non-overlapping semi circular valve seats spaced to either side of the shaft for the valve disc. The valve disc is rigid and inflexible throughout and, when closed, its periphery terminates close to the interior of the valve body under all operating temperatures. When the disc is closed, the semi-circular valve seats cooperate with the recessed rigid periphery of the disc to form a chamber chargeable with purging fluid at a higher pressure than the fluid on the upstream side of the valve and effective to prevent flow of the latter past the valve disc.

Abstract: A bidirectional fluid flow control valve has two bifurcated elastic seat rings positioned in respective undercut grooves which are spaced apart in the flow passageway of the valve body, one on either side of the axis of rotation of a butterfly valve disc having two corresponding spaced apart annular sealing surfaces. One of the undercut seat grooves may be formed in a separate detachable seal ring to facilitate assembly of the disc in the valve. The valve disc is axially symmetrical with respect to its midplane, so that operating torque and flow characteristics of the valve are the same regardless of the direction of fluid flow through the valve.

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: An improved butterfly valve having leak detecting means, the valve body having a flow passageway therethrough, and co-axial top and bottom shaft openings and a seat circumscribing the flow passageway, a disc having an uninterrupted circumferential sealing surface having two spaced apart circumferential sealing contacts providing a circumferential valley therebetween. An upper and lower shaft portion is received in the body shaft openings, one of the shaft portions being secured to the disc providing means of positioning the disc and one of the shaft portions having a passageway therein communicating with the exterior of the valve body, the disc having a passageway communicating with the disc circumferential valley and the shaft passageway so that fluid leakage past either one of the disc sealing contacts will be conducted exteriorly of the body as an indication of loss of valve integrity when the valve is in the closed position.

Abstract: This invention relates to a valve wherein the valve disc is actively pressured onto the valve seat for a positive closure by means of a compressive force exerted on the stem which is linked to the center of the valve disc at a slanted angle. A tensile force applied to the stem disengages the valve disc from the valve seat that facilitates the opening and closing action of the valve.

Abstract: A butterfly valve is adapted to pivot a valve stem to a valve body through openings formed in a ring-shaped elastic valve seat attached inside the valve body, to slidably contact the valve member and the inner face of the valve seat each other in the vicinity of the valve stem, and to form recesses for charging lubricant in the slidably contacting face on the valve seat or on the side face of the valve member.

Abstract: A method of making an improved seat assembly for a butterfly valve. The seat assembly comprises a flexible, circular metal band embedded in a resilient material to form an annular seat assembly. The assembly is made by supporting the band in a fixed spatial position on movable finger members, positioning a mold about, but spaced from, the band, and molding the annular seat assembly in the mold to embed the band. The invention is also directed toward an improved seat assembly. In a preferred embodiment the circular band is made of two curved sections overlapping at the two joints and having diametrically opposite holes in the two overlapping areas.

Abstract: A valve seal mechanism for cryogenic applications includes an undercut groove in a seating region of the fluid passageway in a valve body. Disposed within the groove is a shouldered resilient wear ring of polytetrafluoroethylene, the outer circumference of the shouldered portion of the wear ring having a V-shaped channel formed therein. A solid backing ring having an inner circumferential surface of wedge-shaped cross section makes an interference fit with the V-channel of the wear ring, thereby preloading the channel sides against the respective adjacent sides of the groove. A valve disc has a sealing surface which makes an interference fit with a seating surface forming the inner circumferential surface of the wear ring. Introduction of fluid under pressure and reduction of temperatures from normal ambient to cryogenic both tend to increase sealing effectiveness.

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: A flow control valve is disclosed comprising a valve housing defining a through flow passage, a valve member supported in the housing for pivotal movement with respect to the housing between an open position in which flow through the passage is enabled and a closed position wherein flow through the passage is blocked, and an actuator for moving the valve member between said position. A linkage transmits actuating force from the actuator to the valve member and, a force limiting device limits the actuating force transmitted to the valve member when the valve member is in its closed position.

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: A damper assembly comprising, in combination, a generally rectangular frame including side, top and bottom members, a plurality of damper blades supported at opposite ends on the side members of the frame for limited rotative movement about axes extending longitudinally and substantially centrally of the blades, each of said blades comprising a resilient sealing strip along at least one edge of said blade, and the ends of the blades being angled in opposite directions above and below the rotative axis of the blades, and cooperating with resilient side sealing strips in the frame, the ends of the blades wedging against the sealing strips as the blades approach closed position, the blades being held in closed position by the wedging action.

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: The antifriction device for the control shaft of a flow-regulating valve comprises a hollow body and a closure member rotatably mounted within the hollow body. An annular flange is formed on the control shaft at the level of at least one of the packing gland seals and applied against an annular shoulder of the valve body which surrounds the control shaft, a washer formed of material which is capable of creep deformation being interposed between the flange and the shoulder. A peripheral groove is formed in the shaft opposite to the washer and receives the washer material in the event of creep flow.

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: 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 butterfly valve comprising a valve body, a disk-shaped valve member pivotally provided on the valve body, and a seat ring fixed to the valve body, the seat ring having a circumferential protrusion on an inner surface thereof.

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 butterfly valve with a seal face (4)having two opposite, essentially spherical sections (h, i) intersected by a symmetry plane (k) through the throttle which coincides with an axis through a point (n) parallel with the torsional axis (j) of the throttle and two opposite, essentially conical sections (f, g) on both sides of the symmetry plane. The spherical and the conical sections successively merge into each other. When the throttle is revolved to shutting position, the sealing line (a) which has circular shape is pressed against a valve seat (18) shaped as a circular ring made of steel. An eccentrical location of the torsional axis (j) will cause that a surface contact between throttle and valve seat wil occur simultaneously along the entire sealing line in the shutting movement.

Abstract: A disc valve having a valve housing with a conduit therethrough and a seal ring mounted to the housing. A disc can be pivoted about a pivot axis that is offset from the main valve axis and perpendicular thereto between an open position and a closed position in which a seating surface of the disc contacts a sealing surface of the seal ring in a sealing plane that is perpendicular to the valve axis. The seating surface of the disc is a conically shaped surface that is concentric with the valve axis when the disc is in the closed position. At least a portion of the sealing surface of the seal ring at the intersection between the sealing surface and the sealing plane has the same conical shape. The seal ring can be deflected by moving the disc beyond the closed position to thereby increase the sealing pressure between them.

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: In a butterfly valve, comprising a valve disk which is pivotally mounted in a valve housing for movement between a closed position, in which it prevents the flow of fluid along a passageway defined by the housing, and an open position in which the flow of fluid is allowed, an annular seal is provided to seal between the periphery of the disk and the wall of the passageway when the disk is in its closed position. The seal comprises two deformable sealing members of P.C.T.F.E. with a rigid fireproof ring independently mounted between the sealing elements. The disk is located for pivotal movement by locating means constituted by fire-destructible members of a similar material to that of the sealing elements, so that in the event of a fire that destroys the sealing elements the disk becomes free to move a small distance along the passageway into engagement with the fireproof ring to effect a seal.

Abstract: In a butterfly valve comprising a valve housing including a cylindrical fluid passage and a disc-shaped valve body rotatable within the housing, a hard annular seat provided in the housing and a hard annular rim defined on the periphery of the valve body are adapted to contact one another over the entire circumference when the valve is closed. The valve of the above construction is very easy to manufacture and yet has a good sealing performance.

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: The invention relates to a butterfly valve assembly having a stationary valve body formed with an axial fluid flow passage opening and a turnable valve member adapted for full opening, partial opening and full closing of the said passage opening. There is provided further a valve seat ring composed of an inner protecting layer of fluoride containing resin and an outer back-up layer of rubber or its equivalent. According to this invention, at least two parallel ring grooves are provided on the radially outwardly directing surface of the said elastomer layer which has a substantially channel-shaped cross-section embracing a substantial part of the valve body when the valve seat ring is attached in position to the valve body.

Abstract: A butterfly valve has its seat formed on a detachable ring which is normal to the axis of the valve body. Both the seat and a co-operating seal on the valve disc have frusto-conical contact surfaces such that with the valve closed these surfaces are on a common cone with an axis inclined to body axis. The disc rotates about an axis offset beyond the larger ends of the contact surfaces and also offset to one side of both the body and cone axes. Operation of the valve and its maintenance are thereby improved.

Abstract: A check valve assembly has a housing, and a throttle valve which includes a throttling disc rotatable in the housing and a spindle connected with the throttling disc for rotating the latter. The throttle valve is coated with a protective jacket of a synthetic plastic material, which is of one piece and coats the throttling disc and the spindle, including portions of the latter which extend outwardly beyond the housing. The inner side of the housing may be coated by a protective lining which coats an inner side of the housing facing toward the throttle valve. An additional elastic lining may urge the protective lining against the protective jacket in the region of the spindle. A method of manufacturing the check valve includes forming the protective lining so that it has a greater inner diameter than the protective jacket.

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.