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Class Information
Number: 277/927
Name: Seal for a joint or juncture > Seal including fluid pressure differential feature
Description: Sealing means including means to create a fluid pressure greater than or less than the pressure of the sealed fluid at the joint or juncture to oppose the flow of fluid.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8474433 Engine braking method and system Jul. 2, 2013
8157657 Selectively expandable and contractible barrier Apr. 17, 2012
6880638 Device for an opening in an outer sleeve of a sleeve valve and a method for the assembly of a sleeve valve Apr. 19, 2005
6554016 Rotating blowout preventer with independent cooling circuits and thrust bearing Apr. 29, 2003
6505834 Pressure actuated brush seal Jan. 14, 2003
6481720 Stern tube sealing apparatus Nov. 19, 2002
6345954 Dry gas seal contamination prevention system Feb. 12, 2002
6323496 Apparatus for reducing distortion in fluid bearing surfaces Nov. 27, 2001
6296255 Sealing mechanism for sealing a vacuum chamber Oct. 2, 2001
6089575 Sealed seat for a hydraulic switching element in a mounting space for a direct-controlled cartridge valve in an insertion bore Jul. 18, 2000
5713576 Gas lubricated barrier seal Feb. 3, 1998
5686941 Information recording apparatus having a vacuum system Nov. 11, 1997
5666012 Rotating shaft seal Sep. 9, 1997
5660530 Pump system for biasing seals of a centrifugal pump Aug. 26, 1997
5643026 Safety device for seal systems for propeller shafts on ships Jul. 1, 1997
5611546 Labyrinth seal having a pressure inducing fan means Mar. 18, 1997
5529315 Tandem seal arrangement for mechanical face seals Jun. 25, 1996
5474304 Seal oil supply system using differential pressure accumulator Dec. 12, 1995
5421593 Shaft seal device Jun. 6, 1995
5340272 Multi-stage centrifugal pump incorporating a sealed thrust bearing Aug. 23, 1994
5324051 Fluid-assisted dust seal Jun. 28, 1994
5324046 Sealing device for operating shafts in food processing machines Jun. 28, 1994
5280924 Automatic seal depressurization system Jan. 25, 1994
5277489 Portable batch mixing apparatus for cementitious construction materials Jan. 11, 1994
5248022 Driving device having sealing mechanism Sep. 28, 1993
5211532 Apparatus for applying a back pressure to a pump drive shaft seal May. 18, 1993
5176305 Device for controlling web travel having suction means for applying pressure on the traveling web Jan. 5, 1993
5174250 Dual seal pump Dec. 29, 1992
5158431 Shaft seal assembly, especially for high-pressure turbocompressors Oct. 27, 1992
5133577 Refractory pipeline with gas-tight joint Jul. 28, 1992
5108715 Sealing arrangement for a rotating shaft Apr. 28, 1992
5102150 Pressure vessel flex joint Apr. 7, 1992
5076589 Mechanical seal Dec. 31, 1991
4984811 Pressure control system for stern tube seals Jan. 15, 1991
4961678 Reactor coolant pump having double dam seal with self-contained injection pump mechanism Oct. 9, 1990
4858937 Pressure controller for a buffer fluid seal Aug. 22, 1989
4815748 Shaft seal for gas-filled machines Mar. 28, 1989
4781553 Screw vacuum pump with lubricated bearings and a plurality of shaft sealing means Nov. 1, 1988
4706966 Seal with pressure fluid feed Nov. 17, 1987
4669736 Stirling engine with improved sealing piston ring assembly Jun. 2, 1987
4632650 Vacuum pump having an evacuated gear chamber Dec. 30, 1986
4606652 Shaft seal for turbomachinery Aug. 19, 1986
4586830 Combination rotary gas bearing and seal apparatus May. 6, 1986
4579349 Single ring gland seal for a dynamoelectric machine rotating shaft Apr. 1, 1986
4558870 Mechanical seal assembly Dec. 17, 1985
4556369 Bellows seal Dec. 3, 1985
4543832 Overload protected pressure transducer Oct. 1, 1985
4522230 Orifice plate seal ring for controlled closure check valve Jun. 11, 1985
4515377 Rotary seal assembly having a liquid filled bellows May. 7, 1985
4515512 Seal for high pressure pump or the like May. 7, 1985

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