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Class Information
Number: 137/625.38
Name: Fluid handling > Systems > Multi-way valve unit > Dividing into parallel flow paths with recombining > Reciprocating > Piston > With internal flow passage
Description: Subject matter wherein the piston provides an internal flow passage for the line fluid.










Sub-classes under this class:

Class Number Class Name Patents
137/625.39 Sequential opening or closing of serial ports in single flow line 28


Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8607823 Pressure control valve Dec. 17, 2013
8590570 Two step valve actuator Nov. 26, 2013
8511330 Servo minimum pressure valve Aug. 20, 2013
8511329 Metering valve Aug. 20, 2013
8505578 Actuator for controlling a fluid flow Aug. 13, 2013
8356630 Valve damping system Jan. 22, 2013
8322373 Axial drag valve with internal sleeve actuator Dec. 4, 2012
8312893 Axial drag valve with internal hub actuator Nov. 20, 2012
8297316 Parabolic bonnet for three-way valve Oct. 30, 2012
8267121 Valve assembly for counteracting flow forces Sep. 18, 2012
8235070 Two position three way valve Aug. 7, 2012
8196892 Fluid control valve Jun. 12, 2012
8191579 Directional or flow control valve Jun. 5, 2012
8079386 Variable pressure reducing device Dec. 20, 2011
8066258 Valve seat apparatus for use with fluid valves Nov. 29, 2011
RE42633 Spool valve for fluid control Aug. 23, 2011
7921877 Spool valve and method Apr. 12, 2011
7849876 Valve assembly with sealing force Dec. 14, 2010
7832426 Parabolic bonnet for three-way valve Nov. 16, 2010
7159617 Balanced globe valve Jan. 9, 2007
7028712 Skirt guided globe valve Apr. 18, 2006
7017608 Balanced globe valve Mar. 28, 2006
6968816 Oil flow control valve Nov. 29, 2005
6935371 High capacity globe valve Aug. 30, 2005
6929241 Hydraulic valve and a liquid flow system Aug. 16, 2005
6877964 Multifunction microfluidics device Apr. 12, 2005
6840520 Valve plug seal assembly Jan. 11, 2005
6695578 Bleed valve system for a gas turbine engine Feb. 24, 2004
6527194 Flow control damper Mar. 4, 2003
6394135 Balanced plug valve with contour wall May. 28, 2002
6206021 Sleeve valve with clean out section Mar. 27, 2001
6192982 System for individual inflation and deflation of borehole packers Feb. 27, 2001
6095192 Spool valve for fluid control Aug. 1, 2000
6073736 Valve assembly for a suspension system for a wheeled vehicle Jun. 13, 2000
6047735 High speed solenoid valve Apr. 11, 2000
5887621 On/off bidirectional valve Mar. 30, 1999
5785086 Valve assembly for metered fluid flow Jul. 28, 1998
5769123 Cylinder actuated descale valve Jun. 23, 1998
5647575 Volumetric shaft/valve Jul. 15, 1997
5615708 Flow control valve with non-plugging multi-stage valve trim Apr. 1, 1997
5590683 Compensating relief valve Jan. 7, 1997
5337784 Flow control valve Aug. 16, 1994
5333638 Automatic recirculation valve Aug. 2, 1994
5261453 Valve provided with sound-reducing means Nov. 16, 1993
5255704 Leakproof hydraulic valve Oct. 26, 1993
5236014 Trim for ANSI class V shut off of valves Aug. 17, 1993
5209259 Fluid distribution system having noise reduction mechanism May. 11, 1993
5161576 Valve provided with sound-reducing means Nov. 10, 1992
5090450 Plug valve Feb. 25, 1992
5074519 Fail-close hydraulically actuated control choke Dec. 24, 1991

1 2 3










 
 
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