Abstract: A sealing device has a seal ring in a groove having a step, a first backup ring at the step in the groove, and a second backup ring, in the groove, between both rings offset from the step. The first backup ring includes a bottom-surface-side peripheral surface facing the step's bottom surface, an end surface facing the step's non-sealed-fluid-side side surface, a peripheral surface adjacent to the other member and facing the other member, and a slope facing the second backup ring. The length of the bottom-surface-side peripheral surface is equal to or smaller than the length of the bottom surface of the step. The second backup ring includes a peripheral surface facing the bottom surface of the groove, an end surface facing the non-sealed-fluid-side side surface of the groove, a slope facing the slope of the first backup ring, and a sealed-fluid-side end surface facing the seal ring.

Abstract: Filtration systems having filter elements having an axial seal member with a variable cross-section are described. The variable cross-section is matched by the non-planar sealing surfaces of the housing and housing cover that receive the filter elements. The non-planar sealing surfaces of the housing and the housing cover prevent proper filtration system function when an unauthorized replacement filter element having a flat axial seal member is installed in the housing.

Abstract: Gasket seals for high pressure applications include retaining elements with inner diameter seal elements that interlock with the retaining element to provide resistance to movement in both axial and radial directions between the retaining element and seal element. High pressure sealing may be accomplished using a metallic core retaining element to which an electrically isolating material is bonded on either or both sides. Sealing is achieved through an inner diameter dielectric sealing element, such as a polytetrafluoroethylene (PTFE) inner diameter sealing ring. Flanges of a joint in a fluid flow ling may be bolted together with the gasket seal interposed therebetween. In the event of pressure changes, the inner diameter seal resists being drawn into the flow line, and resists axial movement relative to the retaining element, through dual locking members that secure the seal to the retaining element.

Abstract: In order to prevent the leakage of a gas from an internal space communicating with a compression chamber inside a cylinder in a cylinder head of a compressor, the compressor includes a suction valve pressing portion that presses a suction valve so that the suction valve provided in the internal space of the cylinder head does not slip off through a suction-side head opening, the suction valve pressing portion includes a suction valve pressing and inserting portion that is inserted into the cylinder head through the suction-side head opening, the outer peripheral surface of the suction valve pressing and inserting portion is provided with an annular suction valve pressing groove portion, a suction-side O-ring is attached into the suction valve pressing groove portion, and a suction-side backup ring that suppresses the movement of the suction-side O-ring toward the suction-side head opening is disposed at a position near the suction-side head opening of the suction-side O-ring inside the suction valve pressing

Abstract: O-ring/back-up ring systems that are suitable for use in high pressure applications, including those of 70 MPa automotive hydrogen storage applications, to form a seal between first and second connector bodies. Such sealing systems comprise a back-up ring having a base portion and a flange portion, wherein such ring is configured to prevent extrusion of an O-ring into a gap existing between the back-up ring and a groove into which the back-up ring and O-ring are disposed. High pressure gas storage systems comprising such sealing systems, and methods of sealing a connection in a high pressure hydrogen storage system using such sealing systems.

Abstract: A fluid filter such as an oil filter for a vehicle is provided. The fluid filter includes a body having a first, closed end and a second, open end. A plate is coupled to the second end, the plate having a first surface and a threaded portion having a thread pitch. A channel member has an outer edge coupled to the second end of the body, wherein the channel member defines a recess with an open side opposite the first surface of the plate. A stop member is disposed within the recess of the channel member, the stop member having a first height. A sealing member is coupled to the stop member, and the sealing member has a second height greater than the first height of the stop member.

Abstract: A sealing device for a collet chuck has a tensioning nut, a sealing washer, a main sealing ring and a pressure space. The sealing washer is mounted in the tensioning nut and has a main ring groove, an abutting surface, a liquid-inlet surface, and a liquid inlet. The liquid inlet is formed between an imaginary surface extending from the abutting surface and the liquid-inlet surface. The main sealing ring is mounted and positioned in the main ring groove. The main sealing ring protrudes out of and abuts the main ring groove. The pressure space is formed between a rear side of the main sealing ring and the main ring groove. Therefore, a coolant poured into the sealing device can pressure the main sealing ring to deform the main sealing ring, such that the main sealing ring can tightly abut a tool shank.

Abstract: Seal ring assemblies for use with rotary valves and methods to manufacture the same are disclosed. A seal ring assembly is described that includes a ring-shaped seal to be fixed within the rotary valve, where the seal enables the sealing engagement of a control member with a flow control aperture. The seal is compressed between a first seal clamp and a second seal clamp by a compressive force maintained by a plurality of fasteners extending through the seal and fixed to the first and second seal clamps.

Abstract: A hammer union seal assembly, hammer union seal and method of construction thereof is provided. The method of constructing the hammer union seal includes forming an annular rubber ring having a cylindrical inner surface and a cylindrical outer surface, with the cylindrical outer surface extending between opposite corner edges. The method further includes forming an annular steel ring. Then, recessing and bonding the annular steel ring in one of the corner edges with an outer surface of the steel ring remaining exposed.

Abstract: A sealing array for positioning in an annular space between tubular members to provide a seal therebetween. The sealing array includes a pair of oppositely disposed backup rings, each defining a primary outer seal member of the sealing array. A pair of rigid cap rings is disposed between the backup rings. Each cap ring has a substantially planar surface and an oppositely disposed surface that engages one of the backup rings to energize the backup rings upon the application of sufficient pressure. The cap rings are sized to form controlled extrusion gaps with both tubular members. An energizing element is disposed between the planar surfaces of the cap rings. The energizing element engages a planar surface of at least one of the cap rings and seals the extrusion gaps associated with the engaged cap ring upon the application of sufficient pressure.

Abstract: A scroll compressor includes a fixed scroll, an orbiting scroll, a crankshaft rotationally supported on a frame to drive the orbiting scroll, a seal member between an orbiting scroll back surface and the frame, a back pressure chamber of discharge pressure at an inner peripheral side of the seal member, another back pressure chamber of low pressure at an outer peripheral side so that the orbiting scroll is pressed against the fixed scroll with the pressures of these back pressure chambers, and a guide ring supporting an end surface of the seal member at a side opposite to the orbiting scroll and including a guide portion guiding an inner peripheral surface of the seal member so that the seal member is brought into close contact with the orbiting scroll back surface by a wave spring through the guide ring.

Abstract: Embodiments of the present disclosure generally provide a packer for use within a conduit, such as casing, having non-extrusion rings. The non-extrusion ring is comprised of rigid segments, a support ring and an elastic matrix.

Abstract: To prevent breakage of a sealing device having a main sealing body installed within an annular installing groove (31) formed in one member (3) to slidably and concentrically contact with the other member (2) and a backup ring (12) arranged at a non-sealing space side of said main sealing body, a height (h1±?h1) of said backup ring (12) in a facing direction of a bottom surface (31a) of said installing groove (31) to the other member (2) is greater than a facing distance (L±?L) between the bottom surface (31a) and the other member (2), and said backup ring (12) has a cross-sectional shape which is symmetrical in a thickness direction thereof, and has an easily compressible part (12a) which can be compressed to the extent of the difference (x) between said height (h1±?h1) and said facing distance (L±?L).

Abstract: A sealing structure enables easy fitting of an endless backup ring and includes: tank main body having filling chamber body with filling chamber and mouthpiece portion formed in cylindrical shape integrally with filling chamber body; valve body having insertion portion inserted in mouthpiece portion; O-ring provided between mouthpiece portion and insertion portion; and first backup ring endless and disposed on one side of O-ring to restrict movement of O-ring, wherein annular housing groove is formed on inner circumferential surface of mouthpiece portion such as to be recessed outward with respect to radial direction in order to house O-ring and first backup ring, wherein mouthpiece portion is provided with first cylindrical portion integral with filling chamber body and second cylindrical portion attachable/detachable along axial direction to/from first cylindrical portion, and wherein housing groove is divided along axial direction to face outward when second cylindrical portion detaches from first cylindri

Abstract: A surface seal for sealing a riveted and/or screwed joint between a first and a second component of an aircraft. The surface seal is arranged in the region of joining surfaces of the first and the second component. The surface seal is formed with a pressure-resistant plastic film that is provided with a pressure-sensitive adhesive layer on both sides. The surface seal 1 may furthermore comprise elements for detecting cracks. A method for producing a riveted and/or screwed joint between a first and a second component of an aircraft is also provided, with the joint being sealed with the surface seal.

Abstract: Embodiments of the present disclosure generally provide a packer for use within a conduit, such as casing, having a non-extrusion ring. The non-extrusion ring is comprised of hard segments and an elastic matrix.

Abstract: A seal including a tubular carrier body (1) and two annular sealing elements (2, 3), wherein the carrier body (1) on both sides of its front face is respectively enclosed by one of the sealing elements (2, 3) on the side of its outer perimeter forming a seal. At least one of the sealing elements (2, 3) is made of a non-elastomeric high-temperature resistant sealing material.

Abstract: A gasket (1) and seat (2) system for sealing a joint, such as flanges (3, 4), tube or pipe couplings, housings, shafts, is disclosed. The gasket (1) comprises according to one embodiment an inner portion (10), with a wall (17) facing an interior of the coupling and an outer portion (11), which extends axially forming radial end walls (12, 13). The inner portion (10) of the gasket (1) is formed with an angled wall (18), making the inner portion (10) expand inwards, which angled wall (18) interacts with a matching angled wall (25) of the seat (2), such that the joint has provisions for increasing the sealing ability in cases with increased pressure in the coupling.

Abstract: A pressure seal assembly for sealing a bonnet assembly that is removably received by an access port defined by a body portion of a high pressure control device. The seal assembly inhibits leakage between the body portion and the bonnet assembly and includes an annular graphite gasket having a tapered portion defining an angled surface engageable with a complementally-formed surface on the bonnet assembly. A first anti-extrusion ring is urged into sealing engagement with a surface defined by the access port. A pair of inner and outer anti-extrusion rings are urged into sealing contact with an access port surface and bonnet surface. The bonnet assembly includes a reduced diameter section which defines a seal assembly receiving cavity. The anti-extrusion rings include overlapped ends, which allow expansion and contraction while maintaining overlapping contact. Camming surfaces may include retaining segments which maintain the inner and outer extrusion rings in an assembled relation.

Abstract: A seal and coupling, wherein the seal has a thin profile including a primary sealing element that provides both a face and radial seal, and a secondary or backup sealing element that provides a face seal. The secondary or backup sealing element seals against leakage past or through the primary sealing element, and the retainer may be made of a fluid impervious material for blocking permeation of fluid from the primary to the secondary seal. The retainer may also function to prevent over-compression of the sealing elements, while also maintaining a radial spacing between the sealing elements.

Abstract: Embodiments of the present disclosure generally provide a packer for use within a conduit, such as casing, having a non-extrusion ring. The non-extrusion ring is comprised of hard segments and an elastic matrix.

Abstract: A scroll compressor includes a fixed scroll, an orbiting scroll, a crankshaft rotationally supported on a frame to drive the orbiting scroll, a seal member between an orbiting scroll back surface and the frame, a back pressure chamber of discharge pressure at an inner peripheral side of the seal member, another back pressure chamber of low pressure at an outer peripheral side so that the orbiting scroll is pressed against the fixed scroll with the pressures of these back pressure chambers, and a guide ring supporting an end surface of the seal member at a side opposite to the orbiting scroll and including a guide portion guiding an inner peripheral surface of the seal member so that the seal member is brought into close contact with the orbiting scroll back surface by a wave spring through the guide ring.

Abstract: To reduce a shaft insertion load and ensure a sealing function, a carbon dioxide gas sealing device has a seal ring provided in a mounting groove having a tapered groove bottom, a backup ring having a tapered portion corresponding to the tapered groove bottom, and a gap provided between the side wall surface at the low pressure side of the mounting groove and a side end surface at the lower pressure side of the backup ring, a tapered surface that approaches the peripheral surface of a housing from the side end surface on the high pressure side toward the lower pressure side is provided on the peripheral surface on the side opposite to the tapered portion and the tapered portion has two-stage tapers.

Abstract: To reduce a shaft insertion load and prevent extrusion of a seal ring to the low pressure side, a sealing device has a seal ring in an installation groove formed on a shaft to have a tapered groove bottom section and a backup ring having a tapered section corresponding to the tapered groove bottom section, a gap is provided between a side wall surface at the low-pressure side of the mounting groove and a side end surface of the backup ring, a peripheral surface of the backup ring at the opposite side of the tapered section has a tapered surface which comes closer to a peripheral surface of a housing at the low-pressure side, and the tapered section is formed to have a two-staged taper.

Abstract: When the composite sealing material is press-fitted, the swelled portion of the first sealing portion of a first sealing member is press-fitted to impart sealing ability, the second extended portion of a second sealing member is pressed to the opening portion side of a sealing groove through the first extended portion of the first sealing member, and the upper surface of the second sealing portion is press-fitted to impart sealing ability.

Abstract: Provided is a backup ring capable of reinforcing a seal member such as an O-ring, preventing extrusion of the seal member, and preventing the backup ring from suddenly opening in its circumferential direction, thereby improving the sealability; and a tank equipped with such a backup ring is also provided. A backup ring is formed into a ring body by making a first cut surface and a second cut surface come into contact with each other wherein the cut surfaces are formed by cutting the backup ring. An engagement protrusion is formed on the first cut surface, while an engagement recess capable of engaging with the engagement protrusion is formed on the second cut surface so that the engagement protrusion can be attached to or detached from the engagement recess. When the engagement protrusion and the engagement recess engage with each other, the first cut surface is in contact with the second cut surface, so that circumferential movement of the second cut surface relative to the first cut surface is prevented.

Abstract: An apparatus is disclosed in one embodiment of the invention as including an annular seal (e.g., an o-ring) and a backup ring to provide support to the annular seal. A gland is provided to accommodate the backup ring and the annular seal. The gland has a contact surface which is adapted to contact a corresponding contact surface of the backup ring upon inserting the backup ring into the gland. The diameters of the contact surfaces of the backup ring and gland are sized such that the contact surface of the backup ring radially interferes with the contact surface of the gland, thereby urging the backup ring out of the gland. A retention mechanism, such as interlocking grooves, protrusions, ridges, notches, slots, or the like may be provided in the backup ring and gland respectively to prevent the backup ring from completely exiting the gland.

Abstract: In a sealing device (1) installed in an installation groove (4) provided in one member (2) of two members (2, 3) facing to each other so as to be brought into close contact with the other (3), the sealing device has a seal ring (11) and a backup ring (21) arranged in a low-pressure side (L) of the seal ring (11), the installation groove (4) has a slope bottom surface (4c), the backup ring (21) has a slope surface (21a). The sealing device (1) is to be made such that the seal ring (11) made of a rubber-like elastic body is prevented from being damaged by the backup ring (21) made of a hard material. In order to achieve this object, a second backup ring (31) is arranged between the seal ring (11) and the backup ring (21), and formed by a softer material than the backup ring (21).

Abstract: A sealing array for positioning in an annular space between tubular members to provide a seal therebetween. The sealing array includes a pair of oppositely disposed backup rings, each defining a primary outer seal member of the sealing array. A pair of rigid cap rings is disposed between the backup rings. Each cap ring has a substantially planar surface and an oppositely disposed surface that engages one of the backup rings to energize the backup rings upon the application of sufficient pressure. The cap rings are sized to form controlled extrusion gaps with both tubular members. An energizing element is disposed between the planar surfaces of the cap rings. The energizing element engages a planar surface of at least one of the cap rings and seals the extrusion gaps associated with the engaged cap ring upon the application of sufficient pressure.

Abstract: A seal assembly capable of low temperature service is disclosed. It features upper and lower metallic backup rings that are specially shaped to act as a spring to keep the sidewalls of such rings in contact with the inside and outside surfaces to be sealed to prevent extrusion of the seal material even in low temperature situations. Inner and outer grooves are provided. O-ring seals, used for the ID of the seal, are manufactured to have a slightly greater diameter than the groove into which they will be installed. The greater length provides stored energy to promote sealing functionality in cold temperature situations. The O-rings used for the OD of the seal are manufactured to have a slightly smaller diameter than the groove into which they will be installed. The shorter length provides stored energy to promote sealing functionality in cold temperature situations.

Abstract: An electrically driven oxygen separation assembly and method for applying an electrical potential in which the assembly has one or more tubular membrane elements. The potential is applied at two central spaced locations of a tubular membrane element and at least at opposite end locations thereof. As a result the electric current flow through the tubular membrane element is divided into two parts flowing between the two central spaced locations and the opposite end locations. Additionally, the present invention also provides an end seal to be used in connection with tubular membrane elements.

Abstract: A display assembly for a portable terminal for inhibiting the penetration of foreign matter from an exterior environment into the interior of the portable terminal. The display assembly includes a display for mounting in an open faced compartment enclosed by a bottom/top cover plate, the display having a bottom surface, a plurality of side surfaces, and a top surface for interaction with a user of the portable terminal. The compartment of the enclosure of the display assembly has an interior bottom/top surface and a plurality of interior side surfaces. A resilient seal component of the display assembly is positioned between the display and the compartment, the seal component including a body including a base portion connected to a top portion by a plurality of side portions for defining an interior channel for engaging the sides of the display, once received therein.

Abstract: An O-ring used in a clamp-type joint for a vacuum apparatus, which engages with a concave groove in the outer circumference edge of the center ring and is sandwiched by an outer ring having a U-shaped outer circumference, wherein the radius of the circular arc in the cross-section on the side coming into contact with the outer ring is smaller than the radius of the circular arc in the cross-section on the axial side of the joint. A clamp-type joint for the vacuum apparatus which can exhibit stable sealing performance at a high temperature of 200° C. or more without cracking of the O-ring, as well as an outer ring and O-ring used with the clamp-type joint are also provided.

Abstract: An assembly that includes first and second housing members, a gasket and a plurality of bolts that exert a clamp force to clamp the gasket between the first and second housing members. The gasket includes a plurality of tab members that engage the interior of one or both of the first and second housing members. The gasket tabs can resist a force exerted by a pressurized fluid within one or both of the first and second housing members. A method for assembling and operating an article is also provided.

Abstract: To enable the gasket (3) to securely contact with the box type body (2) when both the body and the cover (1) are downsized and thinned, and prevent fluid leakage through the seal by lessening repulsion of the seal at the time of sealing the clearance between two members (1, 2) to avoid excessive deformation of the cover (1), the gasket (3) and the structure for sealing the clearance between the two members is made such that the main body (31) is adhered to the bottom surface (11) of the cover (1) having the peripheral wall (12), the step face (36) is formed by the body (31) and the lip portion (32) formed at the tip side of the body (31), the contact surface (35) is formed by the side wall (34) of the body (31) and the peripheral wall (12), and the step surface (36) is positioned at the outside from the lip portion (32).

Abstract: A gasket for pipe-to-pipe connections, which is closely received within a rectangular-shaped annular groove in the bell end of a pipe, and provides a compressive, fluid-tight seal with the spigot end of another pipe. The gasket includes a two-part body having a substantially rectangular profile in section, including a relatively rigid component joined to a relatively resilient component. The resilient component includes a radially inwardly projecting sealing lobe for providing a compressive seal with the spigot end of a pipe, and a reinforcement portion of the rigid component is disposed between the sealing lobe and the pipe bell end to provide a radially non-compressible reaction surface against which the sealing lobe is compressed. The rigid component also includes a tapered leading edge portion for aligning and centering the spigot end of a pipe upon insertion within the gasket, and the leading edge portion is reinforced by a plurality of circumferentially spaced ribs.

Abstract: A sealing construction provided with a plate member of metal and a rubber member forming a sealing portion and unitedly fixed to the plate member on which a ring concave groove is formed on an obverse face. And, plural through holes, having enlarged opening end portions on a reverse face, are formed through a bottom face of the ring concave groove and the reverse face. Further, a ring plate is disposed as to contact the bottom face of the ring concave groove and partially close the opening portions of the through holes toward the bottom face, and the rubber member, fit to the through hole and surrounding the ring plate, is unitedly connected to the sealing portion in the ring concave groove.

Abstract: An assembly for sealing a shaker screen assembly in a shaker separator includes a substantially inflexible gasket affixed to each screen support and a flexible gasket affixed to each screen support such that the screen frame rests atop the gaskets on the support around its periphery. A wedge block retainer bracket is affixed to each side wall of the shaker separator above the corresponding section of the screen frame. A wedge block is selectively drivable into the space between the wedge block retainer bracket and the corresponding section of the screen frame, providing force thereto sufficient to seat the screen frame against the inflexible gasket and to compress the flexible gasket between the screen frame and the screen support, thereby providing a substantially fluid tight seal.

Abstract: A longitudinally-endless gasket mounted into a groove portion formed in one of members to provide sealing between this one member and another of the members when they are fastened to each other. The gasket has a sectional shape corresponding to a sectional shape of the groove portion with a ratio (H/W) between a height (H) and a width (W) of the sectional shape being 0.8 to 5.0. The gasket is provided with a plurality of large projecting portions at intervals of 30 to 100 mm and a plurality of small projecting portions at intervals of 5 to 15 mm in a longitudinal direction of the gasket. A width (R2) of each large projecting portion is larger than a width (X) of the groove portion by 0.01 to 0.9 mm. A width (R1) of each small projecting portion is smaller than the width (X) of the groove portion by 0.01 to 0.6 mm. A filling rate of the groove portion by the gasket when the members are fastened to each other is 80 to 100%.

Abstract: A hot air sealing arrangement for sealing between an inner surface of an exhaust duct conveying hot combustion products and an outer surface of a heat exchanger disposed within the exhaust duct includes an inner receiver attachable to the outer surface of the heat exchanger, an outer receiver attachable to the inner surface of the exhaust duct, and a seal having an outer bead engageable with the outer receiver for rotary movement therein and an inner bead engageable with the inner receiver for sliding movement therein. The seal further includes a connecting sheet between the outer bead and the inner bead.

Abstract: One part of an assembly has one wall with a face-end groove in which a rubber-elastic seal is disposed. In the unstressed state, the seal protrudes past two groove cheeks of the groove. The groove cheek toward the outside is provided with a luglike protrusion while the groove cheek toward the inside has a lesser height than the groove cheek and is wedge-shaped in cross section. The protrusion of the outside groove cheek together with the seal forms a sealing device, whose action in the stressed state is based on the one hand on the plastic deformation of the protrusion on a face of a second part and on the other on the high pressure of the seal in the groove.

Abstract: A sealing arrangement (14) has a housing gap, to be sealed, between two components (15, 16) and a seal (1) which consists of two interconnected sealing components (2, 3), a first extrusion-resistant, deformable sealing component (2) and a second more deformable sealing component (3). The first sealing component (2) has an abutment surface (6) facing the sealing surface (17) of the component (15), and a contact surface (9) for abutment on the other component (16). The second sealing component (3) abuts the first sealing component (2) and has an edge (4) projecting past the abutment surface (6). The first sealing component (2) can be pressed onto the sealing surfaces (17; 18) of the components (15, 16; 30, 31) to close the housing gap in response to system pressure. The second sealing component (3) can be sealingly pressed onto the sealing surfaces (17, 18). The sealing arrangement (14) is of simple construction and can produce an effective high pressure seal in Common Rail injectors or similar systems.

Abstract: High-pressure static seals and pressure vessels with static seals for containing fluid at high pressures are shown and described. Embodiments of the invention allow a plug to be easily, manually inserted into and removed from the pressure vessel. A metallic ring in the seal is configured to expand under pressure to prevent an O-ring in the seal from being extruded into a gap between the plug and the vessel wall, but not to expand so much as to cause galling or similar damage when the seal moves with respect to the wall under elevated pressure.

Abstract: A seal structure for use in a compressor has a first member, a second member, an O-ring and a gasket. The first member and the second member constitute a housing of the compressor. The first member and the second member are joined to each other at a joint. The O-ring and the gasket are interposed at the joint in a predetermined manner.

Abstract: A slide gate sealing system including a seal mounting frame disposed between the longitudinal rails and the intermediate and horizontal end frame members of a slide gate frame, a ball seal disposed in the seal mounting frame and having a mounting tail with a mating surface, a seal retainer to control the deformation of the ball seal under pressure, at least one isolation dam on the mating surface of the ball seal, and a ramping mechanism affixed to the interior side of the horizontal end frame member.

Abstract: A valve cover gasket has a perforated central core of metal including protrusions extending from planar sides of the core. Silk screened on each side of the core is a silicone foam rubber layer adapted to replace traditional cork gasket structures used for same purpose. The silicone rubber layers include a foaming agent that causes the material to expand during an oven-curing period. The amount of expansion of the silicone rubber coating is up to three times the thickness of the coating originally applied. As disclosed, the oven cure is for approximately 10 minutes at 300 degrees Fahrenheit. The protrusions prevent the silicone rubber material from being fully compressed; the protrusions are designed not to flatten under normal gasket compression loads. The peaks of the protrusions act as compression loads stops to limit amount of permissible compression of the silicone rubber layers.

Abstract: A sealing device for sealing a joint which is constituted by two sealing surfaces facing each other. The sealing surfaces are displaceable in parallel in relation to each other. The sealing device comprises a sealing element consisting of elastomeric materials of at least two different hardnesses. The sealing element is compressed in the joint while contacting the sealing surfaces. The sealing element forms two portions of elastomeric material having low hardness, said portions contacting the sealing surfaces. The elastomeric material having high hardness is positioned between the portions having low hardness and contacting the sealing surfaces. The elastomeric material having low hardness and contacting the sealing surfaces. The elastomeric material having high hardness is adapted at parallel displacement of the sealing surfaces from the position for forming the joint to increase its size in a direction transversely in relation to the sealing surfaces.

Abstract: A sealed structure for an electronic device, the sealed structure includes a base, a concave cover enclosing electronic components of the electronic device when the cover is fitted to the base, and a gasket-like sealing member that fits between edge portions of the cover and the base to seal the enclosure. A rib portion is formed on at least one of either the cover or the base so as to prevent the sealing member from protruding from the edge portions of the cover and base, thus providing an improved seal.

Abstract: A seal used for a valve housing for a rotatable valve is received in an internal annular groove in the valve housing. The seal has the form of a resilient ring with an annular interior surface, an annular exterior surface, and axially opposite first and second circular end surfaces that extend radially between the annular interior surface and the annular exterior surface. The first and second circular end surfaces of the ring have annular lobes that project axially from the first and second end surfaces. The ends of the lobes are rounded. The annular groove of the valve housing has a center axis, a bottom wall and a pair of opposed side walls extending around the center axis. Slots are formed in the side walls of the groove. The lobes of the ring extend into the slots of the groove. The lobes of the seal and the slots of the groove are non-congruent and form voids between the seal and the groove.

Abstract: A plug is provided for sealing a port of a downhole tool or other device. In one aspect, the plug includes a disk that has an upper surface, a lower surface and an annular groove in the lower surface. The annular groove has an inner wall and a outer wall. An annular seal member is positioned in the annular groove. An annular member is positioned in the annular groove between the annular seal member and the and the outer wall to retain the annular seal member in the annular groove. A member is provided that has least one external thread for engaging the at least one internal thread of the port whereby rotation of the member in a given direction moves the disk toward and compresses the annular seal member against the bottom surface. The plug provides excellent fluid sealing capability with a short axial dimension suitable for small O.D. and thin-walled tools.