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Class Information
Number: 137/596.14
Name: Fluid handling > Systems > Supply and exhaust > Pilot-actuated
Description: Device in which the valves are actuated by fluid pressure motive means controlled by an auxiliary or pilot valve.










Sub-classes under this class:

Class Number Class Name Patents
137/596.15 Common to plural valve motor chambers 113
137/596.16 Electric 281


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8701706 Valve arrangement Apr. 22, 2014
8689832 Volume booster with reduced noise trim Apr. 8, 2014
8631820 Hydraulic control valve for construction machinery Jan. 21, 2014
8631826 Volume booster with stabilized trim Jan. 21, 2014
8613292 Decompression switching valve Dec. 24, 2013
8602055 Hydraulic valve device Dec. 10, 2013
8485223 Hydraulic control valve Jul. 16, 2013
8479768 Directional control valve arrangement Jul. 9, 2013
8464753 Valve arrangement Jun. 18, 2013
8302627 Hydraulic system Nov. 6, 2012
8220478 Fluid flow control apparatus Jul. 17, 2012
8167586 Valve assembly with low resistance pilot shifting May. 1, 2012
7625190 Crossover switching valve Dec. 1, 2009
7044431 Electromagnetically actuated valve system and valve device May. 16, 2006
6722258 Dual cylinder circuit having a joystick with intuitive control Apr. 20, 2004
6595104 Pilot control for a hoist and balancing apparatus Jul. 22, 2003
6546957 Dual cylinder circuit having a joystick with intuitive control Apr. 15, 2003
6497246 Pneumatic snap pilot Dec. 24, 2002
6408876 Control valve Jun. 25, 2002
6308753 System for loading and unloading fluid tanks containing hazardous fluids Oct. 30, 2001
6209580 Multifunction valve assembly Apr. 3, 2001
6192936 Hydraulic control means Feb. 27, 2001
6102362 Gas motor actuator Aug. 15, 2000
6062260 Dual piston pilot valve May. 16, 2000
5918631 Ball-poppet pneumatic control valve Jul. 6, 1999
5865419 Pneumatic actuator having an end mounted control device Feb. 2, 1999
5855226 Valve actuator Jan. 5, 1999
5645263 Pilot valve for a flow amplyifying poppet valve Jul. 8, 1997
5613519 Operating valve assembly with pressure compensation valve Mar. 25, 1997
5409038 Hydraulic circuit including pressure compensating valve Apr. 25, 1995
5213133 Pressure responsive pilot control valve May. 25, 1993
5207059 Hydraulic control system having poppet and spool type valves May. 4, 1993
5137254 Pressure compensated flow amplifying poppet valve Aug. 11, 1992
5107753 Automatic pressure control device for hydraulic actuator driving circuit Apr. 28, 1992
5083430 Hydraulic driving apparatus Jan. 28, 1992
5067519 Safety valve for fluid systems Nov. 26, 1991
5044256 Exhaust pressurizing control for a fluid system Sep. 3, 1991
5024248 Two-position and three-way valve Jun. 18, 1991
4945723 Flow control valves for hydraulic motor system Aug. 7, 1990
4938022 Flow control system for hydraulic motors Jul. 3, 1990
4875500 Diaphragm type of pilot operated directional control valve Oct. 24, 1989
4844127 Actuating mechanism for a transmission control system Jul. 4, 1989
4838308 Multipurpose control valve Jun. 13, 1989
4823834 Diaphragm type of pilot operated directional control valve Apr. 25, 1989
4799420 Load responsive control system adapted to use of negative load pressure in operation of system controls Jan. 24, 1989
4763691 Hydraulic control valve Aug. 16, 1988
4748896 Safety valve assembly Jun. 7, 1988
4744388 Diaphragm type of pilot operated directional control valve May. 17, 1988
4729408 Control system for independent control of fluid actuated devices Mar. 8, 1988
4722362 Pilot operated 3/2 poppet valve Feb. 2, 1988

1 2










 
 
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