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| Number | Title | Issue Date |
| 6880638 | Device for an opening in an outer sleeve of a sleeve valve and a method for the assembly of a sleeve valve A sleeve valve for fluid flow between a hydrocarbon reservoir and a well including a fixed outer sleeve with openings and a movable inner sleeve with openings which can be aligned and misaligned with the outer sleeve openings in order to admit or shut off the fluid ... | 04/19/2005 |
| 6554016 | Rotating blowout preventer with independent cooling circuits and thrust bearing A rotary blowout preventer has a first and a second fluid circuit. Each of the fluid circuits are defined into and out of a stationary body and between the stationary body, a rotating body, and two seals. The first fluid circuit is physically independent ... | 04/29/2003 |
| 6505834 | Pressure actuated brush seal An embodiment providing a seal assembly for turbomachinery for controlling flow of a fluid medium in a fluid path comprises a casing having an internal pressure load path and a seal carrier chamber. A movable seal carrier is disposed within the seal carri... | 01/14/2003 |
| 6481720 | Stern tube sealing apparatus The invention provides a stern tube sealing apparatus which prevents an abrasion by cooling and lubricating a sliding contact surface of a first seal ring, prevents a foreign substance and a seawater from entering so as to further improve a durability of ... | 11/19/2002 |
| 6345954 | Dry gas seal contamination prevention system A seal gas pressure booster system for use with a gas compressor, particularly of the type used for boosting pressure in gas transmission, process or utility industries and which contains pressure about the shaft/casing interface with the use of dry gas s... | 02/12/2002 |
| 6323496 | Apparatus for reducing distortion in fluid bearing surfaces A vacuum seal and fluid bearing apparatus for reducing the distortion of the bearing surfaces of a gas bearing is described. The apparatus includes a stator attached around an aperture in a vacuum housing and having a first planar fluid bearing surface. A... | 11/27/2001 |
| 6296255 | Sealing mechanism for sealing a vacuum chamber A sealing mechanism comprises a support member forming part of the semiconductor producing apparatus which has a vacuum chamber, a rotation shaft rotatably received in the support member, and at least three seal rings axially spaced apart from each other ... | 10/02/2001 |
| 6089575 | Sealed seat for a hydraulic switching element in a mounting space for a direct-controlled cartridge valve in an insertion bore A sealing arrangement for a direct-controlled cartridge valve in an insertion bore, which valve is arranged in a hydraulic system of a device for varying the valve timing of an internal combustion engine wherein to avoid leakages between the individual an... | 07/18/2000 |
| 5713576 | Gas lubricated barrier seal A double, back to back oriented mechanical end face seal arrangement for use in sealing pumps or other devices used in fluid transfer of toxic or corrosive fluid has an intermediate buffer fluid chamber into which a relatively inert gas, such as nitrogen,... | 02/03/1998 |
| 5686941 | Information recording apparatus having a vacuum system There is provided an information recording apparatus having a vacuum system. The apparatus includes a vacuum chamber connected with a first evacuator device. An electronic beam producing device is partially enclosed in the vacuum chamber for emitting an e... | 11/11/1997 |
| 5666012 | Rotating shaft seal A means of sealing a rotating shaft against high fluid pressure with low friction torques, low leakage and low wear. This accomplished by use of sealing assembly comprising a sliding and a floating seal assembly separated by a lubricant filled chamber. Th... | 09/09/1997 |
| 5660530 | Pump system for biasing seals of a centrifugal pump Pumping under the present invention includes movement of material, in a first embodiment fluid and in a second embodiment a piston assembly, between first and second positions including detection of said material at each position. Control circuitry and su... | 08/26/1997 |
| 5643026 | Safety device for seal systems for propeller shafts on ships A safety device on an aft seal system equipped with at least two gaskets for a ship's propeller shaft, which propeller shaft is sealed with respect to the outside water and with respect to a lubricant chamber, and on which a ring-shaped chamber is reserve... | 07/01/1997 |
| 5611546 | Labyrinth seal having a pressure inducing fan means A shaft sealing system for an oil-lubricated shaft bearing in a stationary, externally closed housing filled with liquid vapor may include a shaft projecting into the housing which is mounted in the shaft bearing. The shaft bearing is sealed by means of a... | 03/18/1997 |
| 5529315 | Tandem seal arrangement for mechanical face seals A three-part seal comprising an inboard, an intermediate and an outboard seal and defining two chambers, a mixing chamber between the inboard seal and the intermediate seal and a buffer chamber between the intermediate seal and the outboard seal, provides... | 06/25/1996 |
| 5474304 | Seal oil supply system using differential pressure accumulator 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... | 12/12/1995 |
| 5421593 | Shaft seal device A shaft seal device comprises two mechanical seals for sealingly separating a sealed fluid region from an atmospheric region. A shaft is rotatable about an axis and extends through a casing from a sealed fluid region to an atmospheric region. The mechanic... | 06/06/1995 |
| 5340272 | Multi-stage centrifugal pump incorporating a sealed thrust bearing A multi-stage centrifugal pump is described having a linear series of impellets mounted on a common impeller shaft, with axial thrusts imparted to the shaft by the impellets being balanced by a sealed high-pressure thrust bearing assembly secured to the p... | 08/23/1994 |
| 5324051 | Fluid-assisted dust seal A fluid-assisted dust seal for a drill shaft includes a tubular housing, flexible seals spaced apart in the housing along its length in contact with a drill shaft therein, a fluid plenum between two adjacent seals in the housing, and a fluid inlet for adm... | 06/28/1994 |
| 5324046 | Sealing device for operating shafts in food processing machines The shaft (16) goes through a hole in a wall (10). A bushing (26) is attached to the wall and carries a first gasket (28) adjacent to the wall and sealing against the shaft (16) and a lip seal (32) at a distance from the first gasket so that a toroidal ch... | 06/28/1994 |
| 5280924 | Automatic seal depressurization system A method and apparatus for protecting spaced high pressure seals in a high pressure chamber from damage caused by retained high pressure between the seals after the high pressure in the chamber has been released. A one-way check valve is coupled to the ar... | 01/25/1994 |
| 5277489 | Portable batch mixing apparatus for cementitious construction materials A portable system for on-site batch mixing of cementitious materials, such as mortar and grout, includes a batch mixing machine for metering and mixing cement, sand and water, a cement storage silo sized to hold at least one commercial delivery truckload ... | 01/11/1994 |
| 5248022 | Driving device having sealing mechanism A driving device comprises a first cover, a second cover telescopically engaging with the first cover, and a third cover surrounding the first and second covers. Part of a driving member for moving the second cover in relation to the first cover is arrang... | 09/28/1993 |
| 5211532 | Apparatus for applying a back pressure to a pump drive shaft seal An arrangement for applying a back pressure to a shaft seal of a mechanism such as a pump comprises a piston slidable in a cylinder one end of which communicates with the fluid being pumped and the other end of which contains oil communicating with a seal... | 05/18/1993 |
| 5176305 | Device for controlling web travel having suction means for applying pressure on the traveling web A device for controlling webs of material, for example photographic films of webs of paper or magnetic tapes, in a so-called twin roller hollow suction means is described, wherein a pressure difference exists between the upper and lower side of the web in... | 01/05/1993 |
| 5174250 | Dual seal pump Pressurizing an intermediate fluid chamber of a pump housing is useful to substantially eliminate fluid loss across the seal faces in the pump housing. The subject dual seal pump has a spring-loaded diaphragm in an intermediate fluid chamber of the pump h... | 12/29/1992 |
| 5158431 | Shaft seal assembly, especially for high-pressure turbocompressors A turbocompressor shaft seal, especially for a high-pressure turbocompressor, has each of its gas-side and atmosphere-side slide rings biased toward a rotor ring of the shaft and associated with blocking-liquid compartments which are interconnected by an ... | 10/27/1992 |
| 5133577 | Refractory pipeline with gas-tight joint A refractory pipeline having ceramic pipe sections with joints therebetween located at areas where in which there are the greatest temperature differences in the pipeline. Adjacent pipe sections are connected together by shoulders at the ends of each such... | 07/28/1992 |
| 5108715 | Sealing arrangement for a rotating shaft In an apparatus for treating aggressive, explosive, radioactive or toxic material or solid suspensions within a container and having a rotatable shaft supported in a housing and having one end projecting into the container and another end acted upon by a ... | 04/28/1992 |
| 5102150 | Pressure vessel flex joint An airtight, flexible joint is disclosed for the interfacing of two pressure vessels such as between the Space Station docking tunnel and the Space Shuttle Orbiter's bulkhead adapter. The joint provides for flexibility while still retaining a structural l... | 04/07/1992 |
| 5076589 | Mechanical seal An improved mechanical seal assembly for separating high pressure fluid from lower pressure fluid including a vented Quad-ring in a non-rotatable seal ring for providing lower sliding friction and improved, more consistent pressure deflection of the non-r... | 12/31/1991 |
| 4984811 | Pressure control system for stern tube seals A pressure control system for stern tube seals includes at least two resilient radial lip-type seal rings held so as to surround a propeller shaft linear. The closest seal ring lip to the propeller is arranged to face outboard and the other adjacent seal ... | 01/15/1991 |
| 4961678 | Reactor coolant pump having double dam seal with self-contained injection pump mechanism A double dam seal in a reactor coolant pump includes an internal mechanism in the seal to pressurize its annulus. In one form, the mechanism is an inclined flow passage incorporated in the rotating runner of the seal having an outlet in communication with... | 10/09/1990 |
| 4858937 | Pressure controller for a buffer fluid seal The sealing apparatus is designed to automatically maintain the pressure of a buffer fluid above that of the sealed fluid. The apparatus consists of a cylinder (1) which has a movable piston (4, 5) therein. The piston (4, 5) is coupled to a valve shaft (8... | 08/22/1989 |
| 4815748 | Shaft seal for gas-filled machines In a shaft seal for hydrogen-cooled, turbo-generators, the operating requirements for a minimum gas-side leakage flow without secondary liquid circuit and cooling of the entire axial ring length are fulfilled either with choke elements (8) or with an inne... | 03/28/1989 |
| 4781553 | Screw vacuum pump with lubricated bearings and a plurality of shaft sealing means A screw vacuum pump which includes a casing having a rotor chamber opened at its one end to a suction opening and opened at the other end to a discharge opening; a pair of male and female screw rotors rotatably received in the rotor chamber, each of the s... | 11/01/1988 |
| 4706966 | Seal with pressure fluid feed A seal comprising a gap between e.g. a flange (5) on a shaft and an element (6) arranged in a surrounding housing (2) is used for separating a fluid in a space (3) in the housing from the space (4) surrounding the housing. A pressurized fluid is supplied ... | 11/17/1987 |
| 4669736 | Stirling engine with improved sealing piston ring assembly A sealing piston ring assembly for a Stirling engine which is effective to maintain the required pressure differential on opposite sides of the piston while still enabling free reciprocating movement of the piston within the cylinder. The piston ring asse... | 06/02/1987 |
| 4632650 | Vacuum pump having an evacuated gear chamber A vacuum pump includes an evacuation chamber, a gear chamber, a partition separating the evacuation chamber from the gear chamber, a rotary pump shaft extending through the partition and having one end connected to a vane arranged for rotation in the evac... | 12/30/1986 |
| 4606652 | Shaft seal for turbomachinery A cryogenic turboexpander employing a rotor and a shaft fixed thereto including bearings rotatably supporting the shaft having a pressurized lubricating system. A labyrinth seal is positioned between the bearings and the rotor. A control valve is employed... | 08/19/1986 |
