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Class Information
Number: 251/171
Name: Valves and valve actuation > With means to increase head and seat contact pressure > Seat pressed to valve > Packing presed by gland
Description: Subject matter comprising compressible packing constituting a valve seat which is compressed by a packing gland-like element.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8500090 Ball valve sealing ring Aug. 6, 2013
8413955 Resiliently supported valve seat assembly for a safety relief valve Apr. 9, 2013
8403296 Metal seat seal with flexible sealing edge Mar. 26, 2013
7448410 High differential pressure, low torque precision temperature control valve Nov. 11, 2008
7347408 High differential pressure, low torque precision temperature control valve Mar. 25, 2008
7080820 Elliptical sealing surface for butterfly valve Jul. 25, 2006
7048004 Valve system May. 23, 2006
7004452 Valve seal assemblies and methods Feb. 28, 2006
6997436 Vehicle actuator with valve seat cushioned by o-ring Feb. 14, 2006
6988708 Low torque ball valve seat Jan. 24, 2006
6533241 Retaining piece of a ball valve Mar. 18, 2003
6279875 Gate valve with improved telescoping seat assembly Aug. 28, 2001
6217002 Valve assembly having floating retainer rings Apr. 17, 2001
6217003 Valve assembly having floating retainer rings Apr. 17, 2001
6029948 Valve assembly having floating retainer rings Feb. 29, 2000
5676347 Valve with adjustably pressurized sealing gaskets Oct. 14, 1997
5540414 Actuator and zone valve Jul. 30, 1996
5535986 Torsionallly loaded fluid seals for rotary valves Jul. 16, 1996
5478047 Flexible seating structure for valves Dec. 26, 1995
5388806 Valve assembly having improved valve seat Feb. 14, 1995
5288054 Globe valve and method for making same Feb. 22, 1994
5205536 Top entry, trunnion-type ball valve Apr. 27, 1993
5154397 Peripheral knife gate seal Oct. 13, 1992
5148946 Method and apparatus for delivering predetermined amounts of fluids Sep. 22, 1992
4968000 Valve Nov. 6, 1990
4915352 Sealing arrangement having an annular elastically deformable seal and employment of such sealing arrangement Apr. 10, 1990
4867197 High pressure valve Sep. 19, 1989
4834338 High pressure flexible seat valve trim May. 30, 1989
4815704 Ball valve Mar. 28, 1989
4796858 Dual seal valve Jan. 10, 1989
4795133 Ball valve with a ceramic valve ball and ceramic seat rings Jan. 3, 1989
4762301 Compact multi-service ball valve Aug. 9, 1988
4724863 Flue gas seal Feb. 16, 1988
4685488 Ball valve Aug. 11, 1987
4684105 Ball valve Aug. 4, 1987
4678161 Ball valve Jul. 7, 1987
4617957 Rotary plug valve Oct. 21, 1986
4605199 Ball valve provided with a lock ring Aug. 12, 1986
4580763 Seal-seat for use in ball valves Apr. 8, 1986
4524946 Ball valve having improved seal means Jun. 25, 1985
4511150 Device providing an effective seal for a spherical rotary slide valve Apr. 16, 1985
4449694 Blocked ball valve May. 22, 1984
4428561 Ball valve having improved seal means Jan. 31, 1984
4318420 Ball valves Mar. 9, 1982
4215722 Rotary flow regulating valve and method Aug. 5, 1980
4214730 Chemically inert control valve Jul. 29, 1980
4132386 Valve mechanism for a control valve Jan. 2, 1979
4099705 End entry ball valve with seal wear compensation and force isolated seal Jul. 11, 1978
4026514 Pressure enhanced butterfly valve May. 31, 1977
4022427 Sleeve valve mandrel and seal means for indexing valve assembly May. 10, 1977

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