Abstract: A fluid pumping system includes a housing that defines a fluid chamber having a wall with an aperture therethrough to communicate the fluid chamber with an outside area. A shaft extends through the aperture, and is mounted for axial rotation. The shaft carries a plurality of seals within the aperture that serve to isolate the fluid chamber from the outside area. The seals are spaced apart to define respective cavities that may be liquid filled to prevent seal failure.

Abstract: A sealing device for being mounted on a piston which is movably fitted within a cylinder, includes a sealing ring member having opposite end portions which are interlocked with each other along the circumferential direction of the sealing ring member, and an expanding device for expanding the radius of sealing ring member in the radial direction thereof.

Abstract: A packing member having an annular body with a circular outer wall and circular inner wall, with first and second end walls extending between the inner and outer walls includes a relatively soft upper portion formed from an elastomeric polymeric material having a Shore A hardness of between about 65 and 80 and a fabric reinforced, harder lower portion formed from elastomeric polymeric material having a Shore A hardness greater than the Shore A hardness of the upper portion. A groove extends axially into said annular body through the first end wall and defines a plane perpendicular to an annular axis. The upper portion of the annular body includes sealing lips formed adjacent to at least a portion of the groove, the outer sealing lip extending vertically beyond the inner sealing lip and the inner sealing lip having an inner sealing edge. The inner sealing lip is inclined inwardly to form the sealing edge for sealing engagement when in slidable contact with a separate moveable part.

Abstract: A disc-shaped sealing device for use in temporarily blocking and sealing a plastic fitting in a drain, vent, waste plumbing system is molded as an integral, unitary piece from polymeric material. The sealing device comprises a circular disc and an angled flange extending outwardly and upwardly from the perimeter of the circular disc. The disc-shaped device fits snugly within a barrel of a plastic fitting such that the circular disc is coaxially received in the barrel of the plastic fitting and the angled flange mates with and lies against a bevel in the barrel of the plastic fitting. A lug extends downwardly from the circular disc. First and second elongate grooves are formed in one of the surfaces of the circular disc. These grooves have a common juncture positioned near the forward end of the lug, the grooves diverge and extending along the opposite sides of the lug to near the back end of the lug.

Abstract: A sealing device for sealing a slide plate translatable across an extrusion bore in a polymer filtration apparatus includes an annular seal having a sealing surface which is biased against the slide plate by an annular spring. The seal has a thrust surface which is angled relative to the sealing surface and is located at an opposite axial end of the seal from the sealing surface. The annular spring exerts radial forces against the thrust surface of the seal to bias the seal in an axial direction against the slide plate. Pressurized polymer in the extrusion bore further biases the seal against the slide plate.

Abstract: Arcuate seal segments have radially directed seal faces forming part of a labyrinth seal in a turbine. The segments are adjustably spaced from the locating flanges of the groove formed on a stationary part of the turbine housing to compensate for any distortion of the groove through use. In a positive pressure, variable clearance labyrinth seal, side seals are disposed between the locating flanges of the groove and the flanges of the seal segments and have surfaces at circumferentially spaced positions which are adjustable to maintain concentricity of the seal faces of the seal segments, notwithstanding the distortion of eccentricity of the groove and its locating flanges. Where the locating flanges of the segments normally engage the locating flanges of the groove, variable clearances are provided between those flanges by the interposition of dowels, plugs or pads such that the seal faces of the segments are maintained concentric, notwithstanding distortion of the locating fits.

Abstract: A mechanical labyrinth seal for rotating shafts having first and second ring members. The first ring member, includes a series of annular axially extending grooves and flanges. The second ring member is adopted for insertion into said first ring member with a plurality of complimentary inwardly extending flanges and grooves to form a well known labyrinth seal. There is a slot or channel through the labyrinth or maze connecting the exterior atmosphere to the interior of the seal assembly. The second ring member is adapted to rotate with the shaft and includes an annular recess near the shaft and inwardly toward the housing. There is a plurality of radial holes drilled in the first ring member to be opposite the recess in said second ring member and a plurality of pin members are inserted into the holes in said first ring member and are inserted into the recess of said second ring member. The recess being slightly larger in axial direction than the pin members.

Abstract: A mechanical face seal has a first sealing ring mounted non-rotatably and sealed with respect to a shaft, a second sealing ring mounted non-rotatably and sealed with respect to a housing the second sealing ring being mounted in axial alignment and being resiliently urged into sealing engagement with the first sealing ring.

Abstract: A seal face of at least one ring used in a non-contacting, gap-type mechanical end face seal having a pattern including an optional dam and an annular grooved area. The annular grooved area has one of several embodiments, including entrance lands which are essentially triangular and have one side contiguous with one circumferential edge of the annular grooved area. These embodiments further include a set of converging boundary sides of the groove to provide a pressure zone effect. Seal face patterns include a contiguous groove around the circumference of the seal face and a series of annular bands comprising a repeating pattern of an essentially triangular groove interposed between two adjacent, but oppositely oriented, lands.

Abstract: A labyrinth type seal assembly having one or more controlled porosity elements retained in the labyrinth pathway between relatively rotatable seal elements. Preferably the controlled porosity elements are formed of open celled foam material such as polyurethane. The controlled porosity elements assist in preventing the ingress of contaminating solid or liquid materials, the loss of sealed materials and the flooding or overloading of drain ports.

Abstract: In an oil film bearing assembly for a roll in a rolling mill, where a flexible seal is mounted on a tapered section of the roll neck at a location adjacent to a sleeve fixed to the roll neck and defining the journal surface, the improvement comprising an end portion of the sleeve being configured to overlap and radially confine an end portion of the seal to thereby resist centrifugal distortion of the seal during high speed rotation of the roll neck.

Abstract: In a seal oil system utilized to supply oil to shaft seals of a generator for preventing pressurized gas inside the generator from escaping through an interface of the generator shaft and the generator frame, wherein seal oil is supplied to said seals via a main supply line at a predetermined pressure, the improvement comprising at least one differential pressure accumulator including a barrel having an upper inlet end and a lower outlet end, and a piston slidably mounted in said barrel and movable between said inlet end and said outlet end; a first chamber above said piston having liquid supplied thereto at a pressure equal to internal gas pressure of the generator; a second chamber below said piston charged with generator seal oil; and means for enabling said at least one accumulator to discharge generator seal oil to said main supply line upon temporary decrease in pressure in said main supply line.

Abstract: In a dust cover (6) for the brake cylinder (1) of a disc brake with a ring-shaped boot (7), with a fixing torus (8) at a first end of the boot engaging an annular groove (9) in the piston (3) of the brake cylinder (1) and with a stiffening lining in the shape of a ring (11) which is at least partly surrounded by the material of the boot (7) and which urges the second end of the boot (7) against the inside wall (12) of a ring-shaped recess (5) in the front side (4) of the brake cylinder (1) said second end of the boot (7) forms a unilaterally open, ring-shaped bag into which said ring (11) is inserted. Within said bag the ring (11) is formed with perforations (14) which are penetrated by the material of the boot (7). A radial collar (13) of the ring (11) which projects out of said bag constitutes a surface of abutment for an assembly tool.

Abstract: An aircraft engine firewall seal includes a plurality of discrete, stacked-together sealing disks each have a central hole sized for receiving a feed-through member therethrough, with the disks being larger in outer diameter than the firewall aperture through which the feed-through member extends, and with the central holes being smaller in inner diameter than the firewall aperture. The disks are retained against the firewall by a retainer which fixedly clamps together the disks around the feed-through member for sealing gas flow through the firewall aperture.