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Class Information
Number: 137/625.6
Name: Fluid handling > Systems > Multi-way valve unit > Supply and exhaust > Pilot-actuated
Description: Device in which the valve unit is actuated by a fluid pressure motive means controlled by an auxiliary or pilot valve.










Sub-classes under this class:

Class Number Class Name Patents
137/625.63 Common to plural valve motor chambers 106
137/625.64 Electric 518
137/625.61 Variable orifice-type modulator 78


Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8490640 Latching pressure regulator Jul. 23, 2013
8453678 Piloted poppet valve Jun. 4, 2013
8453679 Hydraulic valve device Jun. 4, 2013
8220478 Fluid flow control apparatus Jul. 17, 2012
8156962 Microvalve device Apr. 17, 2012
8156960 Servo pressure control valve Apr. 17, 2012
8069928 Percussion device, drilling machine including such a percussion device and method for controlling such a percussion device Dec. 6, 2011
8011387 Pressure control device for heavy equipment Sep. 6, 2011
7909060 Pressure control valve Mar. 22, 2011
7832427 Control valve arrangements Nov. 16, 2010
7828245 Dual motor dual concentric valve Nov. 9, 2010
7793912 Fluid pressure actuated poppet valve Sep. 14, 2010
7757714 Two-stage servo-valve Jul. 20, 2010
7735517 Rotary-actuated electro-hydraulic valve Jun. 15, 2010
7237470 Fluid power unit having closed circuit Jul. 3, 2007
6983623 Valve block assembly for I.S. glassware machine and modular pilot valve operated poppet valve assembly Jan. 10, 2006
6957664 Pilot control valve Oct. 25, 2005
6766828 Interlock valve Jul. 27, 2004
6755761 Microvalve for electronically controlled transmission Jun. 29, 2004
6494804 Microvalve for electronically controlled transmission Dec. 17, 2002
6422254 Hydraulic control cold start neutral valve Jul. 23, 2002
6305419 Variable pilot pressure control for pilot valves Oct. 23, 2001
6241487 Fluid powered diaphragm pump Jun. 5, 2001
6192936 Hydraulic control means Feb. 27, 2001
6186045 Latching valve and a multiplexed hydraulic control system utilizing same Feb. 13, 2001
6038957 Control valves Mar. 21, 2000
5996627 Adjustable fluid valve for diaphragm pumps Dec. 7, 1999
5975139 Servo control valve for a hydraulically-actuated device Nov. 2, 1999
5743297 Detent arrangement for holding hydraulic valve member stroked Apr. 28, 1998
5683071 Apparatus for controlling selectively engageable detents in a pilot controller Nov. 4, 1997
5638866 Detent arrangement for holding hydraulic valve members stroked Jun. 17, 1997
5494075 Hydraulic time delay valve Feb. 27, 1996
5353686 Hydraulic circuit for four-position closed-center selector valve controlled by pressure proportional control valve Oct. 11, 1994
5313983 Remote hydraulic control systems May. 24, 1994
5279121 Flow control valve with pilot operation and pressure compensation Jan. 18, 1994
5253808 Power assisted dump valve Oct. 19, 1993
5172726 Pressure regulator Dec. 22, 1992
5136898 Hydraulic system for controlling engagement of frictional coupling in automatic transmission Aug. 11, 1992
5129500 Control valve for timed clutch engagement Jul. 14, 1992
5117868 Pilot-controlled directional valve Jun. 2, 1992
5095806 Device in a hydraulic power system connected to a load driving hydraulic motor Mar. 17, 1992
5081905 Hydraulic pilot operation circuit and valve for quickly discharging oil Jan. 21, 1992
5056561 Remote controlled, individually pressure compensated valve Oct. 15, 1991
5038825 Multiport valve Aug. 13, 1991
5022359 Actuator with energy recovery return Jun. 11, 1991
4966196 Balanced servo-operated multiway valve Oct. 30, 1990
4964424 Pneumatic valve assembly for controlling a stream of compressed air Oct. 23, 1990
4926905 Manually operated air valve and actuator in combination control a hydraulic spool valve for maneuvering heavy equipment May. 22, 1990
4858649 Valve apparatus Aug. 22, 1989
4833798 Hydraulic control for earth working machines May. 30, 1989

1 2 3










 
 
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