Abstract: Piston ring having an endless base ring and sealing ring have a radially outwardly directed base ring face side. The sealing ring has a radially inwardly directed, circularly running sealing ring inner side with three tangential cuts separating three sealing ring segments are arranged in a circumferential direction (U). The base and sealing rings are arranged in succession in a longitudinal direction (L). A top ring is arranged to adjoin the sealing ring having a top ring has a radially outwardly directed top ring outer side and a radially inwardly directed top ring inner side. The top ring has, on the side opposite the sealing ring, a radially running return flow channel extending radially, the sealing face side protrudes in a radial direction beyond the top ring outer side and the base ring face side. The base and the top rings have a greater tensile strength than the sealing ring.

Abstract: A sealing element for a fitting part includes a top section. The top section includes a first surface configured to bear against an outer face of an annular groove of the fitting part and a second surface intersecting the first surface at a first angle. The second surface is configured to bear against a bottom face of the annular groove of the fitting part. The sealing element also includes a bottom section. The bottom section includes a third surface intersecting the second surface at a second angle. The third surface is configured to bear against the bottom face of the annular groove. The bottom section also includes a fourth surface intersecting the third surface. Furthermore, the sealing element includes an indentation formed at an intersection between the second surface and the third surface. The indentation provides a transition between a first width of the top section and a second width of the bottom section. Moreover, the second width is greater than the first width.

Abstract: A sealing assembly includes an elastomer seal having an inner surface and a polymer cap bonded to the inner surface of the elastomer seal and having a dynamic sealing surface. The polymer cap is configured to form a continuous fluid-tight seal against a curved element when pressurized.

Abstract: A piston assembly for a nailer is provided, and includes a piston body with an upper surface, a lower surface and a peripheral edge. A peripheral gland is located between the upper and lower surfaces, the gland having an inner closed end and defining an annular space. An annular piston seal is disposed in the gland, and a plurality of spaced air ports are disposed adjacent the peripheral edge, the ports each being in fluid communication with the gland. The gland and the seal are dimensioned so that during a power cycle of the nailer, pressurized air generated during a fastener driving stroke enters the ports and radially expands the seal for enhancing friction between the seal and a surrounding cylinder. During a return stroke, the seal is radially retracted within the gland to reduce friction between the seal and the cylinder.

Abstract: A device for retracting a piston for a brake caliper is disclosed. The device is suitable for actuating at least one pad for brake calipers of the type comprising a body arranged astride of a brake disc having a rotation axis and two opposite friction surfaces perpendicular to the rotation axis. The piston is suitable for axially translating, thus bringing each pad in contact with force against a respective friction surface of the disc, generating a braking friction torque that is opposite to the rotation direction of the disc. The piston is slidably actuated within a respective seat formed in the caliper body, biased by the pressure of a brake fluid supplied by a supplying plant, in a manner that is controlled by a user to carry out a braking action.

Abstract: A sealing device includes a stationary side installation ring fixed to a stationary side member, a rotation side installation ring fixed to a rotation side member, a stationary side lip integrally provided on the stationary side installation ring and slidably contacting the rotation side installation ring, rotation side lips integrally formed on the rotation side installation ring and slidably contacting the stationary side installation ring, and a pulsar ring for a rotary encoder integrally formed on the rotation side installation ring, and magnetized to be multipolar. The rotation side installation ring includes first and second rotation side installation rings which are attached to each other. The rotation side lips are provided on the first rotation side installation ring at a relatively inner side. The pulsar ring is provided on the second rotation side installation ring at a relatively outer side.

Abstract: A barrier piston with an integrated seal for use with aerosol containers is disclosed. The barrier piston includes a piston body with flow channels disposed on the surface thereof. Stabilizers of a low durometer material are provided on the flow channels to prevent tilting and binding of the piston body within a container. A seal also of a low durometer material is disposed on the base of the piston body to ensure separation of the product and propellant.

Abstract: A seal system is provided for a reciprocating shuttle piston in a piston bore. An annular seal ring is fit to a piston ring groove in the piston. The seal ring is split along a cut extending entirely through a depth of the ring from a first side to a second side and entirely through a width of the ring from an outer peripheral seal face to an inner face. A fluid pressure differential across the seal results in a leak-by or metered flow of fluid across the seal, such as to equilibrate pressure across the piston. In one embodiment, the leak-by seal is fit to a groove in a shuttle piston of a pilot operated valve, the piston having a first face for opening and closing a main flow passage and a second face communicating with a pilot or backpressure passage. In one operation, the seal ring can bleed fluid from the second face for altering the pressure differential across the piston.

Abstract: A seal arrangement provides a seal between a bore and a rod movable in the bore with a gap formed between the bore and the rod. The seal arrangement includes a floating elastomeric sealing ring which is accommodated in a circumferential groove around the rod. The sealing ring sealingly engages the wall of the bore. An annular resilient biasing device is also accommodated in the groove. The biasing device acts between one wall of the groove and the sealing ring to urge the sealing ring against an opposing wall of the groove. In addition, the biasing device is configured to allow passage of fluid past the biasing device between a region of the groove disposed radially inwardly of the sealing ring and the gap between the rod and the bore on the side of the sealing ring opposite the opposing wall. The biasing device has, at least at some circumferential positions therearound, a cross-sectional profile that reduces in radial width towards one wall of the groove.

Abstract: A pressure regulator uses a pliable seal to segregate a pressure confinement volume from the remaining cylinder volume. The pliable seal has a cross section comprising a pair of apexes that are disposed into grooves incorporated into the piston and the cylinder internal wall. The radii of the pliable seal establish a rolling contact to ensure pressure seal in the presence of seal deformation. The seal promotes linear regulator response and minimizes hysteresis causes by frictional forces of prior art piston rings.

Abstract: A piston sealing ring assembly (70) for sealing the piston/cylinder interface of a double-acting gas compressor including a first and second cut piston sealing ring (54,72) each bounded by first and second planar surfaces (6,8), the first piston sealing ring (54) having an overlapped cut with generally circumferentially extending inner and outer overlapping portions (56,58) which contact each other to form a continuous seal extending from the first surface (6) to the second surface (8) of the first piston sealing ring (52) and separating an inner ring gap (62) from an outer ring gap (64). The periphery of the outer ring gap (64) of the first piston sealing ring (54) at the first surface (6) is sealed by the second surface (8) of the second piston sealing ring (72). The second piston sealing ring (72) is similarly disposed in relation to the first piston sealing ring (54) so its outer ring gap (64) is sealed at the second surface (8) by the first surface (6) of the first piston sealing ring (54).

Abstract: In a stripping arrangement for preventing liquid from penetrating at the peripheral gap (1) between a reciprocating component (2) and a casing opening (3) surrounding the latter, a choke ring (8) is provided on the side facing the inlet of the liquid to be stripped in the stripping bushing (4) in addition to at least one stripping ring (5) arranged in a stripping bushing (4), wherein this choke ring is designed with a smooth annular surface (9) on its front side facing the inlet of the liquid, and adheres to the smooth inner front surface (10) of the stripping bushing (4) facing it, exposed to the adhesive forces (S1) in the liquid. In this way, a significant path of entry for the liquid to be stripped into the stripping bushing (4) is blocked, so that the stripping ring (5) has to strip substantially less liquid from the reciprocating component (2).

Abstract: A seal ring that is high in wear resistance and sealability, and less likely to damage an aluminum alloy mating member, and particularly a seal ring having an outer diameter of 20 mm or under and formed with a slit which can be opened easily to be fitted on a shaft. The seal ring is made from a lubricating resin composition containing 50-90 vol % of an aromatic polyether ketone resin, 5-30 vol % of an aromatic polyamide fiber, and 2-30 vol % of tetrafluoroethylene resin. The composition may further contain 2-20 vol % of mica or talc, or 2-30 vol % of a whisker having a Mohs hardness of 3 or over. The seal ring is formed with a slit and has an an outer diameter of 20 mm or under with a bending strain (under ASTM D790) of 3% or over.

Abstract: The present invention provides a piston ring structural body composed of an outer ring continuously formed of a resinous material, an inner ring continuously formed of a resinous material and a ring tensile force applying member for pressing the outer ring radially outwards via the inner ring. The piston ring structural body has a construction wherein the outer ring continuously formed of polyimide is pressed outwards in the radial direction of the piston by a coil expander via the inner ring continuously formed of PTFE. A sliding face of the outer ring, which slides on a cylinder wall, is divided into upper and lower sliding faces, whose respective upper edge portions are provided with chamfers. A contact portion of the inner ring that contacts the coil expander is provided with an upper inclined face extending inwards and upwards and a lower inclined face extending inwards and downwards. The angles of inclination of the upper and lower inclined faces range from 30° to 60°.

Abstract: The present invention provides a sealing structure employing a piston ring structural body of a type wherein an outer ring continuously formed of a resinous material is pressed radially outwards by a metal coil expander via a metal inner ring provided with an abutment. The piston ring structural body has a construction wherein the outer ring continuously formed of polyimide is pressed radially outwards by the coil expander via the steel inner ring provided with the abutment. A sliding face of the outer ring, which slides on a cylinder wall, is divided by a groove into upper and lower sliding faces, whose respective upper edge portions are provided with chamfers.

Abstract: A seal bearing assembly and method for a pneumatic actuator is provided for placement within a groove in an actuator piston. For maintaining a compact size of the piston, the piston preferably has only a single encircling piston groove. In accord with the present invention, a compressible seal and bearing ring are positioned adjacent each other within the single piston groove. The compressible seal ring and bearing ring are sized so that side-to-side movement is possible within the piston groove until the piston is inserted into the pneumatic actuator cylinder. Upon insertion of the piston, compression of the seal ring causes the diameter of the seal ring to expand within the piston groove thereby securing the seal bearing assembly into a fixed position that prevents side-to-side movement of the assembly. The bearing is preferably non-metallic and centralizes the piston within the actuator cylinder to prevent metal-to-metal contact, scoring, and resulting wear.

Abstract: A seal arrangement is disclosed that provides a seal between a bore and a rod movable in the bore with a gap formed between the bore and the rod. The seal arrangement includes a floating elastomeric sealing ring which is accommodated in a circumferential groove around the rod. The sealing ring sealingly engages the wall of the bore. An annular resilient biasing device is also accommodated in the groove. The biasing device acts between one wall of the groove and the sealing ring to urge the sealing ring against an opposing wall of the groove. In addition, the biasing device is configured to allow passage of fluid past the biasing device between a region of the groove disposed radially inwardly of the sealing ring and the gap between the rod and the bore on the side of the sealing ring opposite the opposing wall. The biasing device has, at least at some circumferential positions therearound, a cross-sectional profile that reduces in radial width towards one wall of the groove.

Abstract: A unidirectional rod sealing ring adapted for forming a sealed condition in association with a member such as a piston rod or shaft axially movable in a bore of a hydraulic cylinder, the sealing ring including an elastomeric ring member having an axially facing sealing face, an opposite axially facing pressure face, a circumferential radial outer surface, and a circumferential radial inner surface, the elastomeric ring member being cooperatively receivable in an annular groove around the bore of a hydraulic cylinder with the sealing face in position in opposed relation to a first axial groove wall, and the pressure face positioned in opposed relation to an opposite second groove wall, the sealing face including at least one continuous annular bead of relatively small radial extent positioned for sealably engaging the first axial groove wall, and the radial inner surface including an inner most circumferential lip of relatively small axial extent positioned for circumferential sealed engagement with the member

Abstract: A sealing arrangement for establishing a seal between two machine elements, such as a rod or piston undergoing axial motion within a housing. A rod or piston seal is arranged in a groove of the second machine element, which typically is the housing of the rod or piston. The groove is open in the direction of the first machine element, and contains a seal ring and a prestress ring made of elastomeric material. The seal ring has an essentially T-shaped cross-section and touches the surface of the first machine element which is to be sealed with the sealing surface of its radial ridge, forming a seal. The prestress ring is arranged between the base of the groove and the axial ridge of the seal ring, under elastic prestress. The transition from the faces of the radial ridge to the sealing surface is rounded.

Abstract: A seal assembly for a groove or seal gland in a relatively stationary machine part for sealing an axially displaceable machine part extending therethrough comprises a relatively flexible seal element supported by a relatively rigid support element. The seal element has a static seal that bears on a radial wall of the seal gland to provide superior back-pressure relief while maintaining proper seal element position in the seal gland.

Abstract: A seal ring for placement in the space between a radial groove of a cylindrical member and a housing forming a bore in which the cylindrical member is movably positioned, which is free of scoring and has a fracture line through its thickness to form opposing faces. The faces are rough and mesh together such that when the faces are forced into contact, the faces are then interlocked. Furthermore, the seal ring has true roundness to enable the seal ring to seal the space despite presence of the fracture line. The seal ring is made up of a rigid polymer such as a polyimide, polyamide, polyester, polyetheretherketone, polyamideimide, polyetherimide, polyphenylene sulfide, and polybenzimidazole. The seal ring of the present invention is capable of single ring sealing of the space between the bore and the radial groove. The present invention also provides a device for fracturing the seal ring.

Abstract: In the manufacture of a seal ring having a cut portion at one position on the circumference by injecting a molten molding material from a gate into a cavity of a forming die, the gate is provided at a position apart from the opposite position to the cut portion of the seal ring. In the case of a seal ring with a weld portion, the weld portion is set away from the cut portion.