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Class Information
Number: 251/306
Name: Valves and valve actuation > Rotary valves > Butterfly > Head and/or seat packing
Description: Devices providing a sealing material or element carried by the valve head, by the valve seat or by both.










Sub-classes under this class:

Class Number Class Name Patents
251/307 Adjustable 52


Patents under this class:
1 2 3 4 5 6 7

Patent Number Title Of Patent Date Issued
8651136 Valve with a metal gasket Feb. 18, 2014
8528880 Butterfly valve plate sealing assemblies Sep. 10, 2013
8469336 Valve assembly Jun. 25, 2013
8459609 Butterfly valve assembly incorporating a unitary shaft and butterfly plate valve element Jun. 11, 2013
8459022 Wastegate plug Jun. 11, 2013
8381754 Low friction butterfly ring Feb. 26, 2013
8356796 Unitary shaft extender apparatus Jan. 22, 2013
8348236 Butterfly valve with a rigid seal Jan. 8, 2013
8348235 Butterfly valve with removable valve disc element Jan. 8, 2013
8286938 Flexible seals for process control valves Oct. 16, 2012
8276880 Butterfly valve plate sealing assembly Oct. 2, 2012
8191861 Control valve for controlling a gas flow Jun. 5, 2012
8172202 Butterfly valve assembly including a bearing assembly for serrated spline constraint May. 8, 2012
8161996 Resilient seated butterfly valve with interchangeable off-center and on-center discs Apr. 24, 2012
8162288 Composite valve Apr. 24, 2012
8146887 Damper mechanism Apr. 3, 2012
8091862 Butterfly valves having sleeve inserts Jan. 10, 2012
8028677 Assembly and method for controlling an air intake runner Oct. 4, 2011
7984892 Low friction butterfly ring Jul. 26, 2011
7913389 Method of making a flapper valve assembly Mar. 29, 2011
7798120 Variable air intake device for internal combustion engine Sep. 21, 2010
7775505 Butterfly valve having improved sealing between a shaft seal part and a valve disc Aug. 17, 2010
7758017 Butterfly valves and construction thereof Jul. 20, 2010
7703746 Ground-based power generator with ball-roller bearing butterfly valve Apr. 27, 2010
7637478 Seat ring with insert for butterfly valve, and manufacturing method thereof Dec. 29, 2009
7624716 Butterfly valve type throttle valve of internal combustion engine Dec. 1, 2009
7621502 Minimal-compression butterfly valve Nov. 24, 2009
7490627 Butterfly valve with water-filling function Feb. 17, 2009
7478816 Seal stiffener Jan. 20, 2009
7472681 Throttle valve unit Jan. 6, 2009
7448593 Butterfly valve having flanges forming a positive lock Nov. 11, 2008
7416164 Elliptical sealing surface for butterfly valve Aug. 26, 2008
7401763 Valve seal and method of installing a valve seal Jul. 22, 2008
7392826 Valve device and multiport regulating assembly comprising a plurality of such devices Jul. 1, 2008
7357372 Seat ring for butterfly valve Apr. 15, 2008
7353801 Valve regulating device and intake manifold comprising at least one such device Apr. 8, 2008
7296585 Elliptical sealing surface for butterfly valve Nov. 20, 2007
7266891 Method for sealing a throttle valve housing Sep. 11, 2007
7237761 Valve having double wound lamellar ring Jul. 3, 2007
7234444 Emission gas recycling equipment having butterfly valve Jun. 26, 2007
7225825 Valve seal and method of installing a valve seal Jun. 5, 2007
7007926 Flap valve having dual piston sealing rings Mar. 7, 2006
6990952 Air amount control valve having valve body for controlling air passage Jan. 31, 2006
6938879 Valve seal with pressure relief channels and expansion voids Sep. 6, 2005
6908072 Variable flow control valves Jun. 21, 2005
6843467 Flap valve Jan. 18, 2005
6786469 Anti-rattle valve feature for a heating, ventilating, and air conditioning (HVAC) assembly Sep. 7, 2004
6739579 Exhaust valve for combustion engines May. 25, 2004
6726177 Valve with improved junk ring structure Apr. 27, 2004
6726176 Stepped butterfly valve Apr. 27, 2004

1 2 3 4 5 6 7










 
 
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