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Class Information
Number: 251/307
Name: Valves and valve actuation > Rotary valves > Butterfly > Head and/or seat packing > Adjustable
Description: Devices in which the packing is adjustable to facilitate its original installation or to provide take-up for wear.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8607812 High temperature butterfly valves Dec. 17, 2013
8607815 Butterfly valves with undulating sealing surface Dec. 17, 2013
8256450 Butterfly valves with undulating sealing surface Sep. 4, 2012
8256448 High temperature butterfly valves Sep. 4, 2012
7493888 Air intake control apparatus Feb. 24, 2009
7159844 Two-part flap valve Jan. 9, 2007
7080820 Elliptical sealing surface for butterfly valve Jul. 25, 2006
6886806 Throttle-valve actuating unit May. 3, 2005
6840502 Flap valve for fuel aggregates Jan. 11, 2005
6761348 Throttle devices housing with flexible compensation elements for internal combustion engines Jul. 13, 2004
6589380 Laser welded air control valve and method Jul. 8, 2003
6367771 Butterfly valve with offset bearings Apr. 9, 2002
6189506 Throttle shaft rotation limiting device Feb. 20, 2001
6123319 Damper valve having an adjustable seat Sep. 26, 2000
6010114 Damper system with internal sealing channels and method of assembly Jan. 4, 2000
5743512 Wedge lock butterfly valve Apr. 28, 1998
5620167 Modular butterfly valve for tablets, capsules and the like Apr. 15, 1997
5538029 Method for adjusting valve sealing engagement Jul. 23, 1996
5494257 Damper valve having an adjustable seat Feb. 27, 1996
5370361 Butterfly valve Dec. 6, 1994
5357997 Valve with segmented retainer ring Oct. 25, 1994
5327928 Air seal valve Jul. 12, 1994
4988076 Valves having a turnable closure member such as a butterfly valve Jan. 29, 1991
4846441 Methods and apparatus for adjusting a valve closure member Jul. 11, 1989
4739796 Fluid flow diverter Apr. 26, 1988
4632360 Butterfly type valve seal Dec. 30, 1986
4582080 Bidirectional cryogenic valves Apr. 15, 1986
4508315 Bidirectional valve seal Apr. 2, 1985
4420140 Butterfly valve and a method of manufacture of said valve Dec. 13, 1983
4418889 Fire safe seat for a valve Dec. 6, 1983
4398696 Butterfly valve Aug. 16, 1983
4324383 Seat centerline operated butterfly valve Apr. 13, 1982
4294428 Butterfly valve Oct. 13, 1981
4290615 Butterfly valve Sep. 22, 1981
4281818 Replaceable adjustable butterfly valve seat Aug. 4, 1981
4248404 Dual seal butterfly valve Feb. 3, 1981
4230154 Combined ball and throttle valve Oct. 28, 1980
4220314 Butterfly valve structure Sep. 2, 1980
4174557 Method of mounting valve seats in a butterfly valve Nov. 20, 1979
4114856 Valve seat insert Sep. 19, 1978
4082246 Butterfly valve thruport seal Apr. 4, 1978
4036468 Butterfly valve with self energizing seal Jul. 19, 1977
4020869 Combined stop and intercept valve for steam turbines May. 3, 1977
4015818 Valve with self-retaining valve seat Apr. 5, 1977
4006883 Adjustable seat for butterfly valves Feb. 8, 1977
4005848 Bidirectional pressure-assisted valve seal Feb. 1, 1977
3997142 Pressure sensitive and temperature responsive rotary valve Dec. 14, 1976
3986699 Positive shut-off seal Oct. 19, 1976
3974855 Check valve having self energizing seal Aug. 17, 1976
3970253 Flow area modulator and flow deflector Jul. 20, 1976

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