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Class Information
Number: 251/324
Name: Valves and valve actuation > Reciprocating valve > Piston
Description: Subject matter wherein the valve head is a cylinder fitted for slidable reciprocation within or telescopically on a cylindrical seat, which seat provides a guiding and sealing surface for the head substantially throughout the girth thereof so that the head is guided and sealed in all of its positions, there being a port or ports in the cylindrical wall of either the head or seat which will be opened or closed upon reciprocation of the piston.










Sub-classes under this class:

Class Number Class Name Patents
251/325 With internal flow passage 134


Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8671966 Needleless access port valves Mar. 18, 2014
8616524 Female quick-connect coupling element, and a quick-connect coupling incorporating such an element Dec. 31, 2013
8579257 Valve assembly with annular sealing member having elongated-circle cross-sectional shape Nov. 12, 2013
8496027 List valve, particularly for process technology Jul. 30, 2013
8453668 Vacuum relief valve Jun. 4, 2013
8387671 Purge valve for mounted assembly Mar. 5, 2013
8356622 Fluid valves having dynamic valve trim joints Jan. 22, 2013
8307850 Air intake device for engine Nov. 13, 2012
8272855 Valve and infusion device having the same Sep. 25, 2012
8256738 Double action directional fluid flow valve Sep. 4, 2012
8240634 High-pressure valve assembly Aug. 14, 2012
8186374 Fuel cell valve and fuel cell system using the valve May. 29, 2012
8173081 Stopper body May. 8, 2012
8141848 Piston with integral seals for a water softener control valve Mar. 27, 2012
8015990 Needleless access port valves Sep. 13, 2011
7862006 Air intake valve apparatus for pneumatic gun Jan. 4, 2011
7836915 Staggered cylinders in a valve gate apparatus Nov. 23, 2010
7828269 Disposable valve unit for regulating a flow of urine Nov. 9, 2010
7784651 Foam throttle Aug. 31, 2010
7708024 Fixed cone sleeve valve having ribs downstream of the gate for supporting the cone and other components of the valve May. 4, 2010
7703475 Piston for a linear spool valve Apr. 27, 2010
7690546 Pneumatic tool actuation device Apr. 6, 2010
7624755 Gas valve with overtravel Dec. 1, 2009
7384022 Seal arrangement for a piston valve Jun. 10, 2008
7363937 Replaceable sleeve insert for a choke assembly Apr. 29, 2008
7172175 Suction valve Feb. 6, 2007
7156267 Valve unit for filling machines Jan. 2, 2007
7108011 Self closing mixing cartridge for single handle cartridge type faucet Sep. 19, 2006
7066446 Hydraulic valve arrangement Jun. 27, 2006
7028976 Closure element, especially a valve cone for a continuous pressure valve Apr. 18, 2006
7011117 Filling valve Mar. 14, 2006
6997439 Liquid filling valve Feb. 14, 2006
6969046 Venting mechanism Nov. 29, 2005
6863260 Piston actuator incorporating partitioned pressure chambers Mar. 8, 2005
6837484 Anti-pumping dispense valve Jan. 4, 2005
6811141 Valve including vibration dampening means Nov. 2, 2004
6764265 Erosion resistant slit valve Jul. 20, 2004
6729600 Valve for regulating fluids May. 4, 2004
6695280 Device for pneumatic control Feb. 24, 2004
6637452 Valve with self-cleaning trim Oct. 28, 2003
6495034 Swimming pool valve system Dec. 17, 2002
6478046 Gas pressure regulator Nov. 12, 2002
6467751 Inflation valve Oct. 22, 2002
6338466 Water well recharge throttle valve Jan. 15, 2002
6254061 Medical suction valve Jul. 3, 2001
6192990 Multi-dump metering valve Feb. 27, 2001
6185755 Apparatus for flushing drain pipes Feb. 13, 2001
6132407 Outlet tube device for urinary drainage bag Oct. 17, 2000
6102075 Flow control device Aug. 15, 2000
6102673 Subsea mud pump with reduced pulsation Aug. 15, 2000

1 2 3 4










 
 
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