Abstract: Mechanical seals are imroved in wear properties, erosion, corrosion and galling resistance by forming a diffusion coating in the seal structure surface comprising an intermetallic compound of the seal structure iron, nickel or cobalt base metal and one or more of aluminum, boron, silicon and carbon.

Abstract: A lip seal device for use with an automobile water pump having a simple structure and which can be manufactured with a compact size and at a low cost. The lip seal device includes a housing, a rotary shaft rotatably supported in the housing, a case through which the rotary shaft passes, a sleeve fixed to the rotary shaft, and a sealing member formed of two sheets of lips, the outer end portions of which are attained to the case and the inner end portions of which are in sliding contact with the outside circumferential surface of the sleeve, whereby the generation of abnormal noise in the automobile engine is effectively controlled.

Abstract: A ferrofluid seal wherin the amount of ferrofluid which may be used is increased by tapering the gap in which the ferrofluid is retained from one end of the gap to the other. One side of this gap is the magnet and, where used, pole pieces used to generate the magnetic field retaining the sealing ferrofluid, and the other side is a wall forming the opening to be sealed. The tapering of the gap width may be achieved by tapering either side forming the gap or by tapering both sides. The taper is preferably uniform from one end of the gap to the other.

Abstract: A metallic gasket for sealing a joint between first and second surfaces subjected to high pressure and high temperature. Other gaskets used to seal such joints are of a fibrous composition held together by a suitable bonding agent and a deformable elastomer coat or bead. Many of these gaskets used for high pressure and high temperature use an asbestos sheet which is regarded as toxic and unsafe to handle. The present gasket is comprised of a substantially non-compressible sheet and pair of seals made from a ductile material connected to opposite sides of the sheet. The sheet and seals are positioned between the surfaces to be sealed and the seals conform to the surface finish topography of the surfaces when a predetermined compressive load is applied between the surfaces resulting in a positive sealed joint suitable for high pressure and high temperature.

Abstract: A sealing device for a reciprocating pump of the type having a pump housing provided with a bore formed therein. The bore is provided at its one end with an opening through which it communicates with the exterior of the pump housing while the other end of the bore receives a reciprocating member such as a plunger. The sealing device includes a seal case received in the bore and having a bore through which the reciprocating member extends, a sealing member such as a packing held on the inner periphery of the seal case and having an inner peripheral surface adapted to be slidingly contacted by the outer peripheral surface of the reciprocating member, a closure separate from the pump housing and removably attached to the pump housing so as to close the opening on the one end of the bore, and a coiled compression spring loaded between the closure and either one of the seal case and the sealing member.

Abstract: Production of concrete bell and spigot pipes having a recess (13, 53) in the socket which is relative shallow and is produced using a core (40; 60). The seal (20) made of a relative compact elastomer (16) body may be inserted with its seating portion into the recess (13, 53) at any time after the pipe has been produced. The sealing portion (32) which functions as a combined compression and lip seal has a circular recess of triangular cross section before being pressed together when a pipe system is assembled.

Abstract: An inflatable packer including a tubular mandrel, a pair of collars secured to the mandrel, and an inflatable sleeve connected between the collars about the mandrel. The exterior surface of the mandrel underlying the sleeve is roughened to increase the coefficient of friction between the mandrel and the sleeve.

Abstract: A steel laminate gasket of the invention is used for an internal combustion engine having at least one hole therein. The gasket comprises a first plate having at least one first hole and a first bead situated adjacent to the first hole to surround the same, and a second plate situated adjacent to the first plate. The second plate is provided with at least one second hole, at least one second bead situated adjacent to the second hole to surround the same, and at least one third bead situated at a predetermined distance away from the second bead. When the first and second plates are assembled together, the first bead faces against the second plate, and second and third beads face against the first plate, wherein the first bead is located between the second and third beads. When the gasket is tightened, the first, second and third beads form a plurality of corrugated beads at selected areas around the hole to securely and widely seal the same.

Abstract: A hydraulic elevator jack having a cylinder, a cylinder head, a plunger, and an improved seal assembly disposed between the cylinder head and plunger. The seal assembly includes a compartmentalized sleeve which axially separates a wear ring and a sealing function, with the wear ring being disposed closer to the cylinder, i.e., on the oil or pressure side of the cylinder head, than the sealing function. The wear ring is discontinuous, having at least first and second spaced ends, providing improved distribution of load on the wear ring while reducing drag and tendency of the wear ring to bind. The sealing function includes at least one O-ring energizing seal having a main body portion, and a discontinuous, elastomeric, solid body O-ring disposed in a cavity defined by the body portion. The O-ring is preferably centered relative to the axial dimension of a sealing surface of the main body portion.

Abstract: A sealing arrangement between a shaft and a housing of a fluid flow engine consists of a blocking gas space acted upon with blocking gas, which is delimited by two sealing rings guided in annular grooves of the shaft and radially sealingly abutting at the shaft through-bore. In order to avoid operation-endangering wear of the sealing rings in case of failure of the blocking gas supply, the shaft through-bore is constructed with three diameter regions mutually offset by right angle steps. The steps form each an axial support for the coordinated sealing ring which comes into action when a permissive initial wear has occurred at the sealing ring.

Abstract: A sealing washer providing watertight connection as between electrical conduit parts and including a reinforcing element molded substantially completely within a body of flexible material except for spaced projections extending to a selected surface of the flexible material and serving to locate the reinforcing element accurately within the body of flexible material during the molding process.

Abstract: A multi-stage ferrofluid seal incorporates a ferrofluid reservoir for extending seal life. The reservoir is located between seal stages and contains a quantity of ferrofluid sufficient to replace ferrofluid in the seal stages which is lost due to evaporation or contamination. The seal is designed to withstand a pressure drop between a high pressure area and a low pressure area and the location of the reservoir is selected so that the pressure capacity of the seal stages between the low pressure area and the reservoir is sufficient to withstand the entire pressure drop. The pressure capacity of the seal stages between the high pressure area and the reservoir is less than the entire pressure drop. Failure of the seal stages between the reservoir and low pressure area causes failure of the seal stages between the reservoir and the high pressure area.

Abstract: A steel laminate gasket of the invention is used for an internal combustion engine having at least one hole therein. The gasket comprises a first plate having at least one first hole and a first bead situated adjacent to the first hole to surround the same, and a second plate having at least one second hole and at least one second bead situated adjacent to the second hole to surround the same. The distance from the second hole to the second bead is different from that from the first hole to the first bead. When the first and second plates are assembled together, the first and second beads face against the second and first plates, respectively. When the gasket is tightened, the first and second beads form a plurality of corrugated beads at selected areas around the hole to securely seal the same.

Abstract: A metal plate used for a metal gasket. The metal plate is provided with a plurality of beads around portions to be sealed. The beads intersect with each other and include at least one intersecting portion. At least one depression is formed at the intersecting portion. As a result, when the beads are compressed, the intersecting portion can provide surface pressure at least substantially equal to the portions of the beads other than the intersecting portion.

Abstract: A hygienic shaft seal for a food processing vat is comprised of an annular seal adapted to be inserted into an aperture in a wall of the vat having a shaft extending therethrough for surrounding the shaft and preventing contamination of the food product contents of the vat, yet still allowing for contaminants to be easily flushed from the seal. The seal is secured such that the seal is stationary with respect to the rotation of the shaft and includes an outer lip means for abutably engaging a portion of the shaft disposed in the aperture and an inner lip means for abutably engaging an annular flange on the rotatable shaft adjacent to the interior side of the wall. The seal, the inner lip means and the outer lip means define an annular channel around the shaft.

Abstract: A cylinder-head gasket comprises a metal core plate having two faces and formed with a plurality of cylinder holes, an annular groove of a predetermined depth around each cylinder hole on one of the plate faces, a plurality of stud holes, and a plurality of lubricant/coolant holes. This plate is normally made of stainless steel, a specialty steel, or a steel with a special surface treatment or coating. A resilient seal normally made of a fluorocarbon or silicone is provided on each of the core-plate faces around the lubricant/coolant holes. A cylinder plate of a thickness greater than the groove depth forms respective cylinder rings of the plate thickness sitting in the grooves around each of the cylinder holes. This cylinder plate is normally of a stainless or specialty steel also.

Abstract: A pressure balance sealing ring having a substantially S-shaped, resilient cross section including two oppositely facing convolutions, a central leg coupling the convolutions and a pair of outer legs, each extending from one of the convolutions. The ring is advantageously formed of metal and seals against opposed axially facing but offset surfaces in an annulus between two concentric pipes or opposed axially facing surfaces at the interface formed by two aligned pipes. Each outer leg has a substantially circular sealing line, these sealing lines being radially offset from one another, adjacent the free distal edge of each leg, and spaced from the convolutions. In a modified embodiment, the sealing ring has more than two convolutions and additional legs to connect them. In another series of modified embodiments, the sealing ring has one or two restraining rings rigidly coupled to one or both of the outer legs to ensure the desired direction of torsional deflection under the action of the differential pressure.

Abstract: A metal gasket for a face-seal fitting has an outer section in the form of a circular annulus, an inner section in the form of a circular annulus and having a shorter axial dimension than the outer section. The inner section and outer sections are joined by a tapered section having conical faces on opposite sides thereof facing toward the axis of the gasket. A method of prolonging the useful life of a tubular element in a face seal fitting involves repeatedly engaging an end of the tubular element with the conical face and, when the end of the tubular element wears, engaging the end with a radial face adjacent to the conical face.

Abstract: A slide ring seal for use in a liquid pump, for example, employs an open-ended seal housing and a carrier body which is urged away from the seal housing by a spring. A rubber ring and a slide ring are mounted in the carrier body. The slide ring slidably engages a rotating running ring on a pump impeller, for example, to form a seal. The rubber ring establishes a seal between the carrier body and the slide ring and between the carrier body and the seal housing.

Abstract: A shaft seal (and method for making the same) of the type having an annular elastomeric body, a molded lip, and the molded lip having a liner of sintered polytetrafluoroethylene bonded thereto. The elastomer is molded simultaneously with the polytetrafluoroethylene liner being formed and bonded to the elastomer. The method for making the seal employs the same mold used to make common, molded lip elastomeric seals.