Abstract: A fluid end assembly comprising a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section comprises a housing made of multiple-piece construction. One or more pieces of the housing are configured to have a plurality of stay rods attached thereto. The stay rods interconnect the fluid end assembly and a power end assembly.

Abstract: A valve configured to control a flow of a process fluid includes a pair of packing seals separated by a seal gap space along a linear valve stem of the valve, and a pressurization port that can be used to apply a pressurizing fluid, such as nitrogen gas, to the seal gap at a gap pressure that is higher than the process fluid pressure, thereby ensuring that any leakage past the packing seals will be of pressurizing fluid into the process fluid and/or into the environment, and that no process fluid will escape into the environment. The pressure or flow rate of the pressurizing fluid can be monitored to detect and quantify any pressurization fluid leakage past either of the packing seals, so that a maintenance action can be applied to the valve, such as re-tightening or replacing at least one of the packing seals, or replacing the valve.

Abstract: To make a plasma resistant seal excellent in both a plasma resisting performance and a sealing performance, and prevent an O-ring from protruding to a vacuum side gap, a plasma seal (6) made of PTFE having a plasma resisting performance is provided in a plasma irradiating side of an O-ring (5) as a main seal made of a rubber-like elastic material, an installation groove (4) shallower than a depth of an installation groove (3) provided in an installation member (2) is continuously provided in a plasma irradiation side of the installation groove (3), the O-ring (5) is attached to the installation groove (3), and the plasma seal (6) is attached to the installation groove (4) in a compressed state, or the O-ring is attached to the installation groove and the plasma seal is attached to the plasma irradiation side of the same installation groove (3) in a compressed state.

Abstract: The invention provides an improved seal structure of cutting fluid supplied to a spindle of a milling spindle. The milling spindle 100 comprises a spindle 20 supported within a housing via a bearing 16, and a drawbar 24 having a through coolant passage 22. The cutting fluid C1 passing through the rotary joint 40 and 50 is sent to the through coolant passage 22, but a portion thereof is collected in a drain chamber 105. A rotation member 110 is attached to a rear end portion of the spindle 20, which is equipped with a labyrinth device 150 having a lip seal member 152. An air supply member 120 has two air seal members 142 and 144, and air A1 is sent toward the labyrinth device 150, by which an air seal is formed.

Abstract: A multi-seal sealing assembly with multiple seals so that when one seal wears out another can be moved into sealing position; and a top drive system for wellbore operations with such a sealing assembly; the sealing assembly in one aspect having a seal carrier movable to move at least one secondary seal into sealing position when a primary seal has worn out.

Abstract: Advantageous seal systems are provided that include a barrier member movable relative to a shaft to allow sequential engagement of resilient seal members, e.g., lip seals, with the shaft. Movement of the barrier member may be effected manually or through introduction of pressurized fluid to effect piston-like movement. The disclosed seal assemblies may include an automatic leak detector and may utilize such leak detection to effectuate automatic movement of the barrier member. The barrier member may be moved relative to the shaft while the shaft is in movement, e.g., rotating or reciprocating, thereby permitting seal maintenance without interruption in operation. As seal members are sequentially brought into sealing engagement with the shaft, the previously engaged seal members contribute to the sealing performance of the seal assembly, although no longer effective to establish a stand-alone seal with the shaft. Front and rear bushings may be provided within the seal system.

Abstract: The invention is a shut-off seal assembly for use with the drive assembly of fluid-containing vessels. The shut-off seal assembly first locks the seal carrier of the drive assembly in place so that it may not rotate in a clockwise or a counter-clockwise direction. The seal carrier includes a pair of notches into which a pawl may be fitted preventing seal carrier rotation. The seal carrier surrounds a sleeve which includes a plurality of slots. A backwards rotation of the drive shaft causes drive pins to slide in the angled slots, thereby causing the seal element to move forward and create a seal between the drive assembly and the vessel.

Abstract: A differential pumping seal apparatus includes a differential pumping seal for sealing a first space and a second space from each other in a non-contact manner, and a back up seal mechanism for sealing the first space and the second space from each other in a contact manner. The back up seal mechanism is operated to seal the first space and the second space from each other only when the differential pumping seal is stopped or while operation of said differential pumping seal is stopped.

Abstract: Advantageous seal systems (1500) are provided that include a barrier member movable relative (1504) to a shaft (1550) to allow sequential engagement of resilient seal members (1506), e.g., lip seals, with the shaft. Movement of the barrier member (1504) may be effected manually or through introduction of pressurized fluid to effect piston-like movement. The disclosed seal assemblies may include an automatic leak detector and may utilize such leak detection to effectuate automatic movement of the barrier member. The barrier member may be moved relative to the shaft while the shaft is in movement, e.g., rotating or reciprocating, thereby permitting seal maintenance without interruption in operation. As seal members are sequentially brought into sealing engagement with the shaft, the previously engaged seal members contribute to the sealing performance of the seal assembly, although no longer effective to establish a stand-alone seal with the shaft.

Abstract: A system for pressure molding plastic material includes a source of hot flowable plastic material and a manifold for receiving hot flowable plastic material from the source and for transporting the hot flowable plastic material to a nozzle that is disposed within a nozzle cavity. A heater is provided to heat the nozzle and is positioned outside of, but close to, the nozzle cavity and includes at least one electrical supply wire. A shut-off seal is positioned within the nozzle cavity to seal the nozzle with respect to the wall defining the shut-off cavity. In addition, a secondary seal is most advantageously positioned between the shut-off seal and the heater for ensuring that any hot flowable plastic material that might leak through the shut-off seal does not come into contact with the electrical supply wire. This has been found to increase the reliability and operating life of conventional pressure molding systems.

Abstract: A valve with fire-resistant seal for use in industrial piping applications. The valve includes a valve body with a valve element therein. The valve is illustrated as a ball valve, but other valve configurations could also be used. A valve stem engages the valve element so that it can be rotated between open and closed positions. A conventional primary seal is used on the valve stem for normal conditions. The valve body defines a body bearing surface, and the valve stem defines a facing stem bearing surface. A thrust bearing is disposed between the body and stem bearing surfaces, and a fire-resistant seal is positioned radially inwardly from the thrust bearing. Initially, the fire-resistant seal is not engaged with at least one of the body or stem bearing surfaces, and the fire-resistant seal has a thickness less than an initial thickness of the thrust bearing.

Abstract: The present invention relates to a sealing device for rotating shaft, intended to prevent leaks of a lubricant medium at a bearing supporting the shaft of a machine, this device including, for this purpose, between stationary parts and rotating parts of the machine, a seal carrier mounted in sealed manner on a stationary part, this seal carrier carrying at least one first annular seal surrounding the shaft and provided with a flexible sealing lip capable of providing sealed contact with a rotating bearing surface integral with said shaft.

Abstract: The process tube of a vertical heat-treating apparatus for semiconductor wafers has a port at the bottom to be opened and closed by a lid. A sealing mechanism is arranged to seal the connecting portion between the flange of the port and the flange of the lid. The flanges are provided with annular mirror surfaces on the inner side, which face and contact each other to form an inner seal. The flanges are also provided with annular counter surfaces on the outer side, which face each other with a gap therebetween. A metal sheet member is arranged in the gap such that an outer seal is formed by the metal sheet member and the counter surfaces. The metal sheet member has sheets vacuum-stuck onto the counter surfaces, respectively. A buffer space is formed between the inner and outer seals, and is vacuum-exhausted by an exhaust unit.

Abstract: The present invention relates to a sealing device for rotating shaft, intended to prevent leaks of a lubricant medium at a bearing supporting the shaft of a machine, this device including, for this purpose, between stationary parts and rotating parts of the machine, a seal carrier mounted in sealed manner on a stationary part, this seal carrier carrying at least one first annular seal surrounding the shaft and provided with a flexible sealing lip capable of providing sealed contact with a rotating bearing surface integral with said shaft.

Abstract: A sealing arrangement for sealing lubricating oil in and debris out of a final drive of an earth moving machine is disclosed. The sealing arrangement includes a secondary seal for use in severe environments to protect a primary oil seal. The secondary seal is disposed radially outboard of the primary seal and includes a continuous annular ring having a wear resistant reinforced composite sealing portion. The sealing portion is constructed of a cured mix of an elastomer and reinforcing fibers, having an axial sealing face positionable in dynamic sealing contact with a radial surface of a first member of the final drive.

Abstract: A sealing arrangement for a subsea wellhead component is provided which comprises a primary seal to prevent leakage of internal pressure from within the wellhead component and a secondary seal surrounding the primary seal to prevent entry of ambient pressure into the wellhead component. The secondary seal is adapted to permit pressure which leaks past the primary seal to also leak past the secondary seal and vent to the atmosphere to provide an indication during testing of the primary seal that the primary seal has failed.

Abstract: A method and device for repairing a leak between a channel member through which an axle passes and a cover member of a vehicular transmission or otherwise between inner and outer members. The diameter of the opening in the cover member for the axle is greater than the diameter of the channel through the channel member thereby providing a surface portion of the channel member which is uncovered by the cover member. A plate is installed to sealingly bear against both the cover member and the uncovered surface of the channel member, with sealing material disposed between the bearing surfaces. The plate, which has an aperture for also receiving the axle, has a first surface for sealingly bearing against the uncovered surface of the channel member. This first surface is raised (axially inwardly from) from a second surface which sealingly bears against the cover member. In order to eliminate the necessity otherwise of removing the axle, the plate is alternatively a split plate.

Abstract: A versatile apparatus (2) for controlling the transmission of rotational forces between first and second rotatable members preferably takes the form of a clutch that can be activated by axially shifting an internal actuation member (140) through the introduction of either liquid or gaseous mediums. The clutch includes first and second transmission members (177, 281) which are rotatably mounted within a housing (5) and adapted to be attached to the first and second rotatable members respectively. A coupling assembly (226), preferably including first and second sets of axially spaced interface elements (252-254 and 274, 275), is interposed between the transmission members (177, 284) within the housing and axial movement of the actuation member (140) causes the interface elements (252-254 and 274, 275) to be frictionally engaged.

Abstract: A sealing device for a bearing comprises a first bearing member having a peripheral shoulder portion, a second bearing member, and a seal member integrally connected to the second bearing member and having an inner peripheral portion and an inner peripheral seal lip extending from the inner peripheral portion. The inner peripheral seal lip has first projections extending in a first direction towards a surface of the peripheral shoulder portion of the first bearing member and second projections extending in a second direction opposite the first direction. One of the first projections is initially disposed in contact with the surface of the peripheral shoulder portion of the first bearing member.

Abstract: When the annular seal 11 which provides sealing around a shaft 1 is damaged, something which is signalled by an oil leak, the axially mobile seal carrier 10 is pushed to the left, with the aid of the lug 13, to bring an additional seal 12 into service, this making it possible to eliminate the leak without any dismantling. This operation can be brought about by a jack and can be automated.Application to all rotating shafts.

Abstract: A seal system for an oil well head, wherein the shaft rotates about its axis to drive a progressive cavity type pump. Primary and secondary polytetrafluoroethylene seals surround a sleeve that encircles the shaft. Pressure detectors connect to the space between the seals to detect leaks past the primary seal and signal a remote repair facility. The secondary seal assumes the sealing function while repairs are scheduled.