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Class Information
Number: 251/170
Name: Valves and valve actuation > With means to increase head and seat contact pressure > Seat pressed to valve
Description: Devices having means to press or urge a seat against a valve head.

Sub-classes under this class:

Class Number Class Name Patents
251/172 Fluid pressure 194
251/171 Packing presed by gland 56
251/174 Spring 292

Patents under this class:

Patent Number Title Of Patent Date Issued
8679299 Coke drum bottom de-heading system Mar. 25, 2014
8646752 Ball valve having multiple moveable seats Feb. 11, 2014
8152134 Valve with regulating function Apr. 10, 2012
7337797 Ball valve and method of manufacture Mar. 4, 2008
7303147 Sprinkler having valve module with reciprocating valve seat Dec. 4, 2007
7210667 Redundant testable valve apparatus May. 1, 2007
6902145 Regulating slide valve Jun. 7, 2005
6672563 Ball valve having a magnetic seat sealing device Jan. 6, 2004
6648001 Valve with seat assembly Nov. 18, 2003
6378841 Quarter-turn rotary plug valve with seats reciprocable during operation Apr. 30, 2002
6340029 Apparatus for opening/closing a valve and method thereof Jan. 22, 2002
6213450 Valves Apr. 10, 2001
6123319 Damper valve having an adjustable seat Sep. 26, 2000
5681028 Valve assembly Oct. 28, 1997
5676347 Valve with adjustably pressurized sealing gaskets Oct. 14, 1997
5549275 Valve with adjustably pressurized sealing gaskets Aug. 27, 1996
5338001 Valve apparatus Aug. 16, 1994
5165658 Plastic ball valve ball seal means Nov. 24, 1992
5154397 Peripheral knife gate seal Oct. 13, 1992
5117858 Top entry ball valves with cam adjustable seats Jun. 2, 1992
4815699 Valve with resilient, bellows mounted valve seat Mar. 28, 1989
4683906 Trunnion type ball valve Aug. 4, 1987
4667926 Ball valve May. 26, 1987
4635451 Spring loaded valve for adding cryogenic liquid to a cryostat Jan. 13, 1987
4497467 Plug valve with hydraulically actuated seals Feb. 5, 1985
4424825 Fast closing valve Jan. 10, 1984
4402337 Valve provided with a thermally-actuated mechanism for pressing valve seats against a valve gate body Sep. 6, 1983
4364544 Valve seat with sediment guard Dec. 21, 1982
4327895 Ball valve May. 4, 1982
4235257 Elastic seating element for a cutoff device Nov. 25, 1980
4220314 Butterfly valve structure Sep. 2, 1980
4174728 Sliding-gate valve Nov. 20, 1979
4174557 Method of mounting valve seats in a butterfly valve Nov. 20, 1979
4114639 Lubricated rotary valve with concentric sealing rings Sep. 19, 1978

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