Abstract: A gasket made of nickel, nickel alloy or stainless steel has a sealing face to be engaged by a knife-edge of a joint part. The gasket is cut to form a concave groove, a stepwise reduction in thickness or a sloping cut-out at the sealing face. The sealing face is protected from contact by an adjacent higher land portion. During processing, the gaskets can be stacked or carried on a rest. Any contact occurs at the land portion rather than at the sealing faces, which are protected by the land portions from contact. Dents or scratches in the sealing faces are prevented.

Abstract: The object of this invention is to provide a structure of seal ring, and seal structure using the seal ring for flange joints of composite tanks and pipes, that prevents seal surface variations due to differences in thermal contraction between the seal ring and the tank/the flange joint, etc., that improves the resilience of the seal, and that prevents gas leakage due to poor sealing, in order to achieve the stable sealing. The seal ring fits into a ring groove formed in a sealed unit such as a tank unit or a flange joint to provide a tight seal to contain fluids. The heart-shaped seal ring has three curved surface areas that smoothly flow together, comprised of a first curved seal surface which contacts the formed surface of the ring groove, a second curved seal surface which contacts the seal surface of a second member (e.g. manhole cover), and a projecting curved surface on the opposite side.

Abstract: A high pressure seal consists of a minimal convex excess which induces a plastic-elastic deformation on the flat opposing surface. The excess can also be formed by means of a ring with a circular cross section which after tightening of the screw coupling likewise forms a small convex excess. Removal of the ring without damage is accomplished by application of pressure by means of a smaller additional groove and a pressure feeding bore discharging into the additional groove.

Abstract: A low stress seal seals boundaries between rotor sections of a turbofan engine. The low stress seal includes rounded feet on the ends of legs, which rounded feet cooperate with rounded interior corners within a seal groove. The elimination of sharp interior corners reduces stress and prevents the fatigue failures.

Abstract: A gasket 13 is made of nickel, nickel alloy or stainless steel. A portion which is made a sealing face 1s by abutting on a knife-edge 2b of a joint is cut so as to form a concave groove 10. The concave groove 10 has a structure one step lower than land portions 11a, 11b comprised of both sides 1a. In the process from the production of the gasket to its installation, the land portions prevent the gaskets or the gasket and a rest from contacting with each other. Accordingly, no dent and no scratch is formed.

Abstract: A resilient seal has an annular curved region having a generally C-shaped cross section, and a pair of annular leg regions. Each leg region has a free end and extends generally radially inward towards the inside of the C-shaped cross section. The leg regions contact each other and each form a generally frustro-conical disk spring member extending inwardly from the curved region. The leg regions are adapted to contact each other and to provide a restoring force when the sealing ring is compressed. A first bend connects one of said leg regions to the curved region, and a second bend connects the other of the leg regions to the curved region.

Abstract: An improved sealing structure for a mixing valve of hot and cool water is disclosed. A first trench with an approximate V shape is formed on the upper surface of the lower wall along the peripheral rim of the water inlets and water outlet and is retained with a proper distance with the peripheral rim of the water inlets and water outlet. A second trench with an approximate inverse V shape is formed on the bottom surface along the peripheral rim of the water inlets and water outlet and is retained with a proper distance with the peripheral rim of the water inlets and water outlet. The shape of the first trench is completely symmetric to the second trench on the lower wall of the casing. A sealing ring is installed between the surface of the lower wall of the casing and the bottom surface of the fixing disk and has a symmetric shape with respect to the aforesaid trenches. Thus, the sealing ring can be engaged with the two trenches.

Abstract: A buoyancy system for a deep water floating platform includes at least one buoyancy module coupled to the a riser. The module may be coupled to a ring structure of an end cap coupled to the riser, or two modules may be coupled to a ring structure to couple them together. The modules have an interior flange extending into the interior cavity and abutting the ring structure. Fasteners couple the interior flange of the module to the ring structure to form an interior attachment. A seal may be formed between the flange of the buoyancy module and the ring structure, and may include a seal member disposed in a groove. A test port extends to the groove to allow testing of the seal. The module may include a material and may have a thickness that together allow a wall of the buoyancy module to expand outwardly under an internal pressure and force the flange against the ring structure to enhance sealing between the flange and ring structure.

Abstract: This invention relates to a more serviceable seal assembly of the above type, particularly adapted for applications in the cooling systems of internal combustion engines. The seal assembly of this invention comprises an annular ferrule, an elastomeric seal circunferentially disposed thereabout, a pair of annular mounting rings and a clamping device. Tightening of the clamp expands the elastomeric seal outward against the annular mounting rings which are statically sealed within the members of the engine. Selective sizing of the annular mounting rings can be used to control coolant flow. The use of this seal assembly does not require the removal and replacement of members of the engine for installation or servicing.

Abstract: A tubular connection, an example of which is a subsea wellhead having a primary and secondary seal areas allows the use of a backup or contingency gasket for engagement with the secondary seal area in the wellhead should a failure occur in the primary seal area. In the preferred embodiment, the primary and secondary seal areas are sufficiently separated such that the erosion damage which occurs from leakage with the original gasket adjacent the primary seal area, which can spread below the primary seal area, leaves the secondary seal area unaffected. A backup or contingency gasket can be inserted for sealable contact with the secondary sealing area for further well operations.

Abstract: A method of sealing at least a first seal surface to a second seal surface comprises the steps of placing a flexible ring member between the first and second seal surfaces and juxtaposing the first and second seal surfaces. The flexible ring member is compressed between the first and second seal surfaces. Thereafter, the flexible ring member is expanded into at least one of a first recessed area in the first seal surface and a second recessed area in the second seal surface, with at least one of the first and second recessed areas having a plurality of spaced apart pressure points that contact the ring member. This method of sealing assures that when the O-ring (flexible ring) permanently sets over time, it takes the shape that makes the seal effective for a long time under high temperature, high pressure.

Abstract: A multi-channel rotary joint with which a plurality of fluids of the same or different types can be made to flow as desired, including first connecting spaces sealed by mechanical seals and second connecting spaces sealed by mechanical seals and by elastic seals, such connecting spaces being between a joint housing and a rotator. A series of fluid passages that pass through the connecting spaces are also formed in the joint housing and the rotator. The mechanical seals are end-contact type seals and comprise balanced seals with a balance ratio k such that 0≦k≦1. Each elastic seal has a U-shaped cross section and is engaged and fixed to one of the opposing peripheral surfaces in a state in which an annular groove between inner and outer peripheral lips opens into the space with the higher pressure out of the second connecting space and its adjacent space.

Abstract: A fixture for centering and holding an elastomeric O-ring in position between vacuum sealing flanges during assembly and use thereof, having an annular body defining an outer surface and O-ring holding flange disposed on the outer surface for holding an elastomeric O-ring. The outer surface of the annular body defines a pair of beveled surfaces which enable the fixture to be inserted between the vacuum sealing flanges during assembly thereof without any substantial binding. The annular body of the fixture also defines a cylindrical inner surface having a diameter which is substantially identical to the diameter of the cylindrical inner surfaces of the sealing flanges to substantially prevent turbulent gas flow effects.

Abstract: The process tube of a vertical heat-treating apparatus for semiconductor wafers has a port at the bottom to be opened and closed by a lid. A sealing mechanism is arranged to seal the connecting portion between the flange of the port and the flange of the lid. The flanges are provided with annular mirror surfaces on the inner side, which face and contact each other to form an inner seal. The flanges are also provided with annular counter surfaces on the outer side, which face each other with a gap therebetween. A metal sheet member is arranged in the gap such that an outer seal is formed by the metal sheet member and the counter surfaces. The metal sheet member has sheets vacuum-stuck onto the counter surfaces, respectively. A buffer space is formed between the inner and outer seals, and is vacuum-exhausted by an exhaust unit.

Abstract: The invention relates to the sealing of detachable joints of the pipelines and manifolds by using metal elastic gaskets. A detachable stationary sealing device comprises the flanges having sealing surfaces, being tapered for one of the flanges and concave for another, a sealing gasket and a retaining releasing ring. The gasket is provided with elastic tabs being in contact with the sealing surfaces of the flanges, and an annular projection, the inner cylindrical surface of which is in contact with the outer cylindrical surface. The retaining releasing ring is of C-shaped cross-section and is fixed in the annular groove made on said cylindrical surface of the flange. The annular projection of the gasket is provided with the transversal external projection that fits into the groove of the retaining ring. The use of the invention reduces dimensions while increasing its reliability.

Abstract: A clamped flange pipe or tube fitting assembly includes a resilient seal ring compressed in a chamber formed by cooperating recesses in opposed flanges. The chamber and seal ring are dimensionally related in a manner to produce circumferentially continuous, radially spaced primary and secondary seal areas and to assure a continuous interior surface between the connected pipes or tubes with no recesses to entrap process fluids.

Abstract: A safe mountability of a radial seating ring without mistakes, in which the radial sealing ring comprises a spring steel sheet, coated with an elastomer and having a cross section of undulating course, with at least one bulge pointing toward the interior of the sealing ring and at least one bulge pointing outward in the opposite direction, for contact with parts to be sealed off.

Abstract: A seal includes first and second axially opposite loops integrally joined together by a coextensive web in a collective ring having a circumferential split. The two loops are arcuate in section, with radially outer and inner sealing lands. And, the web is disposed radially between the outer and inner lands. The loops are disposed in corresponding grooves of adjoining members for effecting a seal therebetween and accommodating differential radial and axial thermal movement.

Abstract: A sealing device comprises two substantially conical or cylindrical sealing surfaces (6, 8) which are axially introducable one into the other to a substantially concentric sealing position in which the sealing surfaces define between themselves an annular sealing space (12) and further comprising a sealing element (10) consisting of elastic material, the sealing element being compressed in the sealing space between the sealing surfaces and being at least in axial direction bound to a first sealing surface of said sealing surfaces. The second sealing surface (8) is formed with at least one projection (16) and the sealing element forms in cooperation with said first sealing surface at least one pair of portions (20, 22) positioned adjacent each other in the axial direction and presenting different compression resistances under the influence of the projection of the second sealing surface.

Abstract: An improved seal allows a fuel nozzle to be securely fastened to an aircraft refueling adaptor and the seal does not allow fuel to leak or spill. Significantly, the seal is simple to install and remove because the fuel nozzle does not have to be disassembled or removed from the fuel hose and the seal does not have to be bonded to the seal support. The seal is securely attached to the fuel nozzle without the use of adhesives because the seal is much stiffer than conventional seals, and the seal is mechanically retained in a deep annular groove in the seal support structure. The improved seal includes a body with a first leg, a second leg, a cavity and a projection which is attached to the first leg and it extends at least halfway across the width of the cavity. Desirably, the projection extends about two-thirds of the way across the width of the cavity.

Abstract: The process tube of a vertical heat-treating apparatus for semiconductor wafers has a port at the bottom to be opened and closed by a lid. A sealing mechanism is arranged to seal the connecting portion between the flange of the port and the flange of the lid. The flanges are provided with annular mirror surfaces on the inner side, which face and contact each other to form an inner seal. The flanges are also provided with annular counter surfaces on the outer side, which face each other with a gap therebetween. A metal sheet member is arranged in the gap such that an outer seal is formed by the metal sheet member and the counter surfaces. The metal sheet member has sheets vacuum-stuck onto the counter surfaces, respectively. A buffer space is formed between the inner and outer seals, and is vacuum-exhausted by an exhaust unit.

Abstract: The sealing assembly for a port of a valve or the like is disclosed. In detail, the sealing assembly includes the port having a circular shaped end with a circular shaped knife-edge thereon. The sealing assembly further includes a hollow cap having a closed first end with an aperture therethrough and an open second end. The cap further includes internal threads adapted to mate with the external threads of the port. A gasket is mounted within the cap having flat first and second principle sides and made of a deformable metal, the first principle side of the gasket for mounting against the circular shaped knife edge of the port. A plunger having a circular shaped disc portion is adapted to fit within the hollow cap and is engagable with the first principle surface of the gasket and includes a shaft portion extending out of the aperture. The cap and shaft of the plunger include external wrenching flats.

Abstract: A gasket is provided for joining lengths of pipe having dissimilar end faces which are of approximately equal diameters and which are substantially normal to the longitudinal axis of the pipes. The end faces each include a circular recess which are of differing diameters. The gasket has a first side which has a surface contour which is a mirror image of one of the faces and the opposite side has a surface contour which is a mirror image of the other end face. The outer periphery of said gasket is of a substantially lesser thickness than its inner marginal portion so that compression during use of the thicker inner marginal portion is minimized.

Abstract: A sealing gasket for insertion into a circumferentially continuous groove of a flange joint for joining axially aligned tube ends, the flange joint being of the type having axially opposed flanges at the tube ends to form a groove there between when the joint is assembled, the groove being formed by axially opposed seal faces and radial end faces of the flanges, the groove comprising a groove first portion that is open to an interior flow passage of the tubes and a groove second portion that extends radially outward from the groove first portion, the gasket having a gasket first portion that seals the groove first portion and a gasket second portion that extends from the gasket first portion and into the groove second portion; the gasket second portion being axially compressed when the joint is assembled and engaging with the radial end faces to produce a radial compression of the gasket; the gasket second portion having a volume that is less than volume of the groove second portion to form an expansion space

Abstract: A sanitary-pipe gasket includes an annular disk portion of predetermined thickness, and a projecting portion which is provided concentrically with the annular disk portion on each of the upper and lower surfaces of the annular disk portion. The annular disk portion and the projecting portion of the sanitary-pipe gasket are integrally formed of porous PTFE such that the density of the annular portion ranges from 1.0 to 1.9 g/cm.sup.3 and the density of the projecting portion ranges from 0.3 to 1.8 g/cm.sup.3. The gasket is produced by disposing a porous PTFE sheet of 0.3 to 1.4 g/cm.sup.3 density and 1 to 10 mm thickness in a mold, and applying pressure perpendicular to the sheet at room temperature or with heating.

Abstract: A pipe joint assembly comprises a pair of cylindrical pipe ends of the same internal diameter in axially contiguous aligned relationship. Connecting flanges extend radially outward of each of the pipe end and have opposed faces defining a circumferentially continuous packing groove including a first axially narrow portion opening to the cylindrical interior of the pipe ends and a second axially wider portion radially outward of the first portion. An elastomeric gasket positioned in the packing groove. The gasket is sized and dimensioned to completely fill the first axially narrow portion and extend to within the second portion. The radial inner extent of the gasket provides a smooth continuation of the cylindrical interior surfaces of said pipe ends when the flange faces are at their limit of movement toward one another.

Abstract: A sealing arrangement for a subsea wellhead component is provided which comprises a primary seal to prevent leakage of internal pressure from within the wellhead component and a secondary seal surrounding the primary seal to prevent entry of ambient pressure into the wellhead component. The secondary seal is adapted to permit pressure which leaks past the primary seal to also leak past the secondary seal and vent to the atmosphere to provide an indication during testing of the primary seal that the primary seal has failed.

Abstract: A bore seal assembly for sealing between first and second adjoining tubular members which comprises a cylindrical seal sleeve having a bore and two radially outwardly extending sealing lips for engaging a seal pocket formed in the adjoining ends of the first and second tubular members, a cylindrical wear sleeve mounted within the bore for supporting the seal sleeve within the seal pocket, and an elongated erosion sleeve extending longitudinally from the wear sleeve into at least the first tubular member, whereby the erosion sleeve protects the first tubular member against erosion.

Abstract: A sealing ring containing an electrode for sensing electrochemical conditions within a fluid handling system, in particular, the occurrence of crevice corrosion, has a body formed of a continuous loop of an electrically insulating fluid-impervious material having a surface which can form a fluid-tight seal with elements of a fluid handling apparatus, an electrode embedded within the body and electrically insulated from electronic conductive contact with those portions of the surface of the body that contact the fluid handling apparatus, and channels extending between the electrode and the surface of the body of the sealing ring to permit electrochemical contact between the electrode and the fluid within the system. The sealing ring also includes electronically conductive wires to connect the embedded electrode to external electrical devices, e.g., electronic measuring equipment.

Abstract: A sealing ring is disclosed for radially sealing two coaxial surfaces. The sealing ring has an annular convolution with a first radially facing sealing surface and a pair of annular leg portions forming second and third radially facing sealing surfaces. Each of the leg portions are provided with an annular bend to increase the radial resiliency of the seal. In an alternate embodiment, each of the leg portions of the sealing ring has a pair of annular bends. In yet another embodiment, the sealing ring is constructed of a pair of plies or layers.