Abstract: A seal assembly includes a first and second machine element, a seal and a support ring. The support ring has a first side edge facing a high-pressure side which is partially convexly curved, formed obliquely or is partially formed at an acute angle relative to a movement axis of the two machine elements. The seal has a retaining portion and a primary sealing lip extending from the retaining portion on the high-pressure side and abuts in a dynamically sealing manner against a sealing surface of the second machine element. The primary sealing lip directly abuts and is supported over the majority of its longitudinal extent on the first side edge of the support ring on the low-pressure side. The retaining section of the seal is held clamped between the support ring and the first machine element and abuts the first machine element in a statically or indirectly statically sealing manner.

Abstract: A pre-stressed concrete pipe is made by casting a concrete pipe inside a metal cylinder and then being pre-stressed by injecting solidifying compound under pressure into the boundary between the metal cylinder and concrete pipe, and includes a pair of end rings within the metal cylinder, each having a metal ring with an annular groove and an elastic band having a curved end to provide a rounded corner on the concrete pipe. After the solidifying compound is solidified, the concrete pipe retains the compression increasing its strength to withstand pressure, and moments caused by external loads. The pre-stressed concrete pipe further includes a bell ring mounted at one end and a spigot ring having a gasket ring at the other end. A bell clamp is mounted on the bell ring.

Abstract: A gas cylinder includes supply passages for supplying, to an accommodation chamber, a part of gas supplied to a second port. When the pressure in a first pressure chamber is equal to or lower than a prescribed pressure, a valve element closes a discharge flow passage by the biasing force of a spring member and the pressure in the accommodation chamber. When the pressure in the first pressure chamber exceeds the prescribed pressure, the valve element is moved by the pressure in the first pressure chamber, against the biasing force and the pressure in the accommodation chamber, to thereby open the discharge flow passage.

Abstract: The invention relates to a ring seal which comprises a main body capable of implementing a seal by static contact relative to a first cylindrical element, and a first circumferential lip capable of engaging by friction with a cylindrical surface of a second cylindrical element, said cylindrical elements being substantially coaxial and mounted so as to pivot relative to one another. The main body comprises a front surface configured to be in axial contact with a front surface of the first cylindrical element, the main body comprising a second circumferential lip radially opposite the first circumferential lip and capable of being in radial contact with a cylindrical surface of the first cylindrical element.

Abstract: A seal includes an at least partially cylindrical annular body defining a radial direction, an axial direction, and a circumferential direction. The at least partially cylindrical annular body has a radially outer flange, a radially inner ring, and a resilient intermediate portion joining the radially outer flange to the radially inner ring. The radially outer flange defines a seal outer diameter and a flange axial thickness, and a ratio of the seal outer diameter to the flange axial thickness ranges from 14.0 to 15.0.

Abstract: A drive system for a fluid end of a reciprocating pump assembly including a drive member and a power end housing having a crankshaft rotatably disposed therein. The assembly includes a gearbox secured to the power end housing, the gearbox operatively connecting the drive member to the crankshaft for rotation thereof. The assembly further includes at least one arm member extending between the gearbox and the power end housing, the at least one arm member positioned to resist relative movement between the gearbox and the power end housing.

Abstract: A thickness dimension of a peripheral edge of a seal element held by an inner brim wall portion of an outer case and an inner brim wall portion of an inner case is set to be larger than a thickness dimension of a remaining portion of the seal element, and a ring concave groove is formed on the peripheral edge of the seal element.

Abstract: Disclosed is a sealing member for a master cylinder. The sealing member for a master cylinder, which is formed in a ring shape and is installed between an inner surface of a cylinder body and an outer surface of a piston, includes an inner wing part configured to contact the outer surface of the piston, an outer wing part configured to contact the inner surface of the cylinder body, and a sealing rear wall part configured to connect the inner wing part and the outer wing part. The sealing rear wall part is provided with an oil passage to connect an oil entrance formed at the inner wing part and an oil entrance formed at the outer wing part, and the oil passage includes a retardation passage which is longer than a shortest straight-line distance which directly connects the oil entrances.

Abstract: An annular sealing device for a shaft and housing that can maintain sealing properties under fluid pressure load when creep occurs in a cut portion due to thermal expansion and the perimeter is shortened. The sealing device includes a seal ring unit configured to fit within an annular groove in the shaft, and has, on the side thereof where the outer periphery is located, a sliding surface on which the seal ring unit slides on the housing; and a lip portion on the inner periphery of the seal ring. The lip portion of tip is disposed on the side of the annular groove where a groove bottom thereof is located, in such a way that the tip thereof is deformable in a direction in which the tip increases the distance between the seal ring unit and the groove bottom of the annular groove when under pressure.

Abstract: An annular seal member configured to seal a gap between a shaft hole and a shaft inserted into the shaft hole, the annular seal member comprises: an annular base part; an annular lip, which includes a lip edge that is configured to be contact with one of a hole face of a shaft hole and an outer periphery of a shaft, the one of which is a seal mating face; a first convex part, a second convex part and a passage recess, which is provided at a face of the base part facing the seal mating face; a concave part, which is formed at a position between the second convex part and the base end portion of the annular lip, and which has a circumferential size larger than a recess width of the passage recess.

Abstract: Master cylinder for a hydraulic braking circuit, particularly for a motor vehicle, comprising an annular seal (1) placed in a housing (6) of the body comprising an internal dynamic sealing lip (14) surrounding the piston, fitting into an annular groove (20) of the piston when this piston is in a rear rest position, an outer static sealing lip (10) pressing against a wall of the housing, and an additional static sealing lip (16) which presses against a wall of the housing of this seal and with the outer lip defines a small closed volume (V) of liquid.

Abstract: A bonded piston seal, which comprises a metal ring, and a rubbery elastomer seal as vulcanization-bonded thereto expect the sliding site along which a mating seal member slides, where the rubbery elastomer seal is partially bonded to the metal ring through an adhesive layer, wherein the adhesive layers comprises (a) an underlayer adhesive layer comprising a phenol resin and an epoxy resin, and (b) an overlayer adhesive layer comprising a phenol resin, a halogenated polymer, and a metal oxide. Not only the distinguished initial adhesiveness, but also the distinguished water-resistance can be obtained by providing (a) the underlayer adhesive layer of the afore-mentioned components and (b) the overlayer adhesive layer of the afore-mentioned components.

Abstract: Disclosed herein are a sealing member for a master cylinder and a master cylinder having the same. The master cylinder is configured such that a communication hole of a piston is rapidly brought into communication with an oil path toward an oil tank upon release of braking. This may minimize meaningless retracting movement of the piston and delay in a braking release operation. The sealing member for the master cylinder includes an outer wing part to come into contact with the cylinder body, and an inner wing part to come into contact with the outer surface of the piston. The inner wing part includes a seal formed at a tip end thereof and at least one oil passage formed in a surface thereof opposite the outer surface of the piston.

Abstract: Our problem relates to a master cylinder with a U-shaped seal. Our goal is to avoid defective bleeding of hydraulic braking systems. The defects arise out of the fact that the vacuum causes the lips of the seal (21) to stick together and to stick against the wall (41). To achieve this, reliefs (42) will be created on one wall (44) of one lip (28) facing the other lip (27) and on the edge face (50) of this same lip. These reliefs will prevent the lips from sticking tightly to one another and to the wall facing the edge face of the lips. This lack of sticking will prevent a vacuum from being created between the two lips and between the edge face of the lips and the wall (41). As a result, the seal will be able to return to a position in which bleeding can be performed effectively.

Abstract: In a rod sealing system, which comprises a buffer ring, a rod seal, and a dust seal, provided successively in this order from a fluid hydraulic side toward the outside in an annular clearance between two members in reciprocating motion, the buffer ring is made up of a thermoplastic polyurethane molding product obtained by subjecting a thermoplastic polyurethane molding product prepared by reaction of (A) a high molecular weight polycarbonatediol having a number average molecular weight Mn of 500-6,000, (B) an aromatic diisocyanate, and (C) a low molecular weight diol as a chain elongation agent in an NCO/OH ratio of 0.95-1.20, to heat treatment under conditions that a glass transition point (Tg) of hard phases becomes 170° C. or higher, preferably 170-230° C., and an endothermic peak area (?H) at Tg becomes 5 J/g or more, by differential scanning calorimetry.

Abstract: A transfer device for transferring an actuator displacement, has a housing with a first recess having a first and second plunger displaceably mounted. These plungers are actively connected via at least one transfer chamber by a fluid. The active connection causes the second plunger to be displaced when the first plunger is moved and vice versa. The transfer chamber is hydraulically coupled via a sealing gap to a compensating chamber compensating the pressure differences, in a delayed manner. The transfer device also has a chamber device with a compensating chamber, a chamber housing, and a first plunger. The chamber device has a device with a first body with a recess including a second body, and with an elastomer placed in the recess between the first and second body. The elastomer has a first groove extending at least partially along the recess.

Abstract: Pumping cartridges useful for medical and surgical pumping and infusion procedures. In one aspect, a series of pumping cartridges include cylinders and pistons which have a sealing component including a circumferential, flared sealing flange and can be configured to enable the pumping cartridge to generate high liquid pumping pressures. Many of the pumping cartridges can be configured to be detachable from a pump drive unit and disposable after a single use. Some pistons include or at least partially form a valve and/or are relatively movable with respect to a connected piston rod. Valves include a valve seat and a movable sealing element able to create a seal capable of withstanding differences in fluid pressures thereacross of at least about 1,000 psi. The movable sealing element is concave in shape, and may be curved for improved sealing performance. Methods for pumping or infusing a liquid for delivery to the body of a patient or a surgical or medical instrument.

Abstract: A valve assembly includes a body having a bore and a valve received within the bore for movement between an open position and a closed position. First and second sealing members are secured for movement with the valve and are positioned between the valve and the body such that an internal fluid pressure within the bore is applied to a first side of the sealing members and a common reference pressure is applied to a second side. An axial force imparted on the valve adjacent the second sealing member is less than an axial force imparted on the valve adjacent the first sealing member. A resiliently compressible member is positioned to bias the valve toward the normally open position. The valve is moved to the closed position when the internal fluid pressure exceeds a predetermined pressure and returns to the open position when the internal fluid pressure is substantially less than the predetermined pressure.

Abstract: The annular sealing cup with axis ?, a so-called replenishment cup, which is intended to be positioned between a hydraulic cylinder and piston and which has a <<U>> axial section and has application to braking circuits comprises: a static branch (10) defining a static sealing annular lip, a dynamic branch (12) defining a dynamic sealing annular lip, and a core (14) connecting the static (10) and dynamic (12) branches and defining a annular bead (15) opposite the lips. According to the invention, the cup is characterized in that the connecting surface (24) between the static branch (10) and the core (14), located opposite the bead (15), has a concave shape corresponding to a local reduction in the thicknesses of the static branch (10) and of the core (14) at the connecting region between the static lip and the core (14), so as to define a rotation area (21).

Abstract: A system for injecting a predetermined amount of a secondary fluid into a primary fluid stream uses a liquid additive injection pump driven by a fluid powered motor driven by the primary fluid stream. The liquid additive pump has a reciprocating piston movable within a cylinder between upstroke and downstroke positions to meter the secondary fluid and a piston sealing mechanism comprising spaced-apart distal and proximal sealing elements. The distal piston-sealing element is flared in the direction of piston downstroke and the proximal piston-sealing element is flared in the direction of piston upstroke.

Abstract: The present invention discloses a sealing insert, in particular for a piston in a hydraulic brake system, comprising a central valve arranged in a cavity, a supporting body and a rubber-elastic sealing body that is adhesively connected to said supporting body. The supporting body exhibits through holes which are penetrated by the sealing body for fixing purposes.

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 roll back seal is provided for a disc brake assembly that reliably returns a piston to a release position from a braking position with an extended sealing life. The disc brake assembly includes a caliper housing with at least one piston receiving opening, first and second friction members coupled to the caliper housing and one or more pistons movably coupled to the caliper housing to move one or both of the friction members. The first and second friction members form a rotor receiving slot. At least the first friction member is movably coupled to the caliper housing and at least one piston is movably coupled in at least one piston receiving opening of the caliper housing to move the first friction member between a release position and a braking position. The piston receiving opening has an annular side wall with an annular groove formed therein. The annular roll back seal is located in the annular groove between the caliper housing and the piston.

Abstract: A compliant rod guide and seal assembly for use in a damper includes an annular outer casing having a through hole and a support ring received in the outer casing. The support ring has an outer radius that is less than the inner radius of the outer casing such that a gap is formed between the support ring and the outer casing. The rod guide and seal assembly further includes a rod seal received in the support ring for receiving a rod therethrough, whereby the ring and seal can move laterally relative to the outer casing to accommodate lateral movement of the rod.

Abstract: An oil seal or fluid seal for providing a seal between a cylinder and a piston rod is provided. The oil seal has an annular seal lip which has on a conical inner circumferential surface thereof a plurality of annular projections which are arranged axially of the seal lip. One of the annular projections which is located more axially outside of the cylinder is larger in the height above the inner circumferential surface than one of the annular projections which is located more axially inside of the cylinder. By this, under a condition where the annular projections which are located more axially inside of the cylinder are subjected to a high pressure within the cylinder, the annular projections which are located more axially inside of the cylinder and the annular projections which are located more axially outside of the cylinder are nearly equal in the contact pressure against the piston rod, thus causing all of the annular projections to deform nearly equally.

Abstract: A sealing-device having a body section and an anti-extrusion section is shown, the body section being disposed on top of the anti-extrusion section. The body section includes sealing surfaces for enclosures in which the sealing device is located. the anti-extrusion section prevents extrusion of the body section.

Abstract: A hydraulically operated central release unit for a motor vehicle clutch is designed as a slave cylinder that is arranged inside a clutch housing. The central release unit includes a housing in which a ring piston is movably guided. The ring piston has a groove ring seal with lips sealingly contacting the sealing tracks. To reduce the wear on the sealing lips and to avoid squeaking noises of the groove ring seal, the surfaces of the sealing tracks are provided with micro cavities.

Abstract: A seal assembly especially suitable for use as the sealing element in the annular cylindrical bore of a concentric cylinder assembly. The seal assembly includes an annular insert structure of rigid material and an annular seal member of elastomeric material bonded to the insert structure. The annular insert structure has an I-beam cross-sectional configuration including an outer annular flange structure centered on an axis, an inner annular flange structure centered on the axis concentrically within the outer annular flange structure, and annular web structure extending radially between the inner and outer annular flange structures. The web structure coacts with the flange structures to define left and right continuous annular grooves in the left and right faces of the insert structure and defines a plurality of circumferentially spaced holes extending axially through the web structure between the left and right grooves.

Abstract: A piston rod seal includes a sealing disk provided with a reinforcement element, a guide mechanism, and a support piece which are adapted to be placed consecutively in a metal pipe or similar object functioning as a housing, and which are adapted to surround a piston rod when installed. To create a seal having relatively few components and a relatively small axial dimension, the reinforcement element is connected to the sealing disk and is constructed to function as a guide element for guiding the axial movement of the piston rod.

Abstract: An improved resilient type sealing member for use at least in an application which requires both sealing of an annular space between an inner surface of a first member and an adjacent outer surface of a second member at least partially disposed for reciprocal movement within such first member and for providing support to such second member during such reciprocal movement. The improved resilient type sealing member includes a generally round resilient disc-like member having each of a first predetermined diameter and a predetermined thickness. Such resilient disc-like member includes a pair of radially opposed and substantially flat parallel side portions. A first groove, having a first predetermined shape and a first predetermined depth, is formed in a first one of such pair of radially opposed and substantially flat parallel side portions. Such first groove being disposed closely adjacent an outer edge of the resilient disc-like member.

Abstract: A seal element, in particular an elastomer gasket for use in hydraulic annular cylinders, such as in clutches, with a radially outer and a radially inner seal lip, characterized by the fact that the seal lips are axially offset in relation to one another.

Abstract: A novel reciprocating pump for cryogenic fluids. The pump has a cylinder sleeve, head, intake valve, discharge valve, and a reciprocating piston including a mechanical spring energized seal having a generally U-shaped jacket and a helical spring in the bight of the U.

Abstract: This invention relates to a seal between two components which two components can move relative to one another. The seal can be used in particular for hydraulic, pneumatic or hydropneumatic systems, whereby at least one elastic seal element interacts with a running surface. Preferably, this seal is used between a piston-shaped part and a cylinder-shaped part. In any case, the running surface, which running surface is mobile relative to the gasket, is provided with depressions. The depressions in the running surface, which running surface interacts with the gasket, form a cross-hatched pattern.