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Class Information
Number: 137/596.12
Name: Fluid handling > Systems > Supply and exhaust > With bypass
Description: Device including an additional valve to connect the upstream side of the main valve directly to exhaust so that the fluid does not pass through a downstream port of the main valve.










Sub-classes under this class:

Class Number Class Name Patents
137/596.13 Controlled by supply or exhaust valve 240


Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8469047 System to control pressure in a test device Jun. 25, 2013
7958768 System to control pressure in a test device Jun. 14, 2011
7415989 Spool activated lock-out valve for a hydraulic actuator load check valve Aug. 26, 2008
7131453 Hydraulic valve device and method for assembling the same Nov. 7, 2006
7089957 Redundant valve system Aug. 15, 2006
6964281 Multiple hydraulic spool valve assembly with a monolithic body Nov. 15, 2005
6694859 Variable pressure relief valve Feb. 24, 2004
6502600 Hydraulic line connection Jan. 7, 2003
6470912 Dual-spool hydraulic directional valve Oct. 29, 2002
6394130 Control valve device May. 28, 2002
6311947 Valve assembly Nov. 6, 2001
6209580 Multifunction valve assembly Apr. 3, 2001
6119727 Pneumatic seat valve having a rapid exhaust mode Sep. 19, 2000
5755260 Mono-block control valve with regeneration conduit May. 26, 1998
5701933 Hydraulic control system having a bypass valve Dec. 30, 1997
5664477 Control system for a hydraulic circuit Sep. 9, 1997
5606901 Hydraulic circuit for turning purposes Mar. 4, 1997
5515879 Load sensed multi-purpose pressure control valve May. 14, 1996
5333454 Flow control valve unit Aug. 2, 1994
5090726 Suspension control system Feb. 25, 1992
5069301 Vehicle power assisted steering system Dec. 3, 1991
5065784 Valve assemblies and means Nov. 19, 1991
5020570 Combined valve modular control panel Jun. 4, 1991
4982803 Modulator and power-assisted steering circuit comprising such a modulator Jan. 8, 1991
4964433 Rotary valve Oct. 23, 1990
4909279 Fluid control valve Mar. 20, 1990
4895182 Hydraulic control unit Jan. 23, 1990
4879944 Hydraulic control valve Nov. 14, 1989
4865079 High pressure hydraulic flow control valve Sep. 12, 1989
4860635 Steering control valve for variable power assist steering system Aug. 29, 1989
4858651 Control valve for construction equipment Aug. 22, 1989
4852462 Operating noise-free fluid flow distributor circuit for variable assist power steering system Aug. 1, 1989
4825909 High pressure hydraulic flow control valve May. 2, 1989
4738278 Hydraulic control device Apr. 19, 1988
4730543 Closed center hydraulic valve control system for aerial lift Mar. 15, 1988
4708601 Dual diaphragm pump Nov. 24, 1987
4691618 Hydraulic control valve Sep. 8, 1987
4672885 Servo device for controlling flow in a hydraulic installation, particularly for the assisted steering of a vehicle Jun. 16, 1987
4658705 Control system for hydraulic fluid pressure Apr. 21, 1987
4655250 Open center unloading valve Apr. 7, 1987
4638924 Self mixing sprayer Jan. 27, 1987
4605042 Pilot oil supply arrangement Aug. 12, 1986
4574838 Means for saving energy in a hydraulic circuit Mar. 11, 1986
4570735 Dual rotary valve for variable assist power steering gear for automotive vehicles Feb. 18, 1986
4569367 Hydraulic valve inlet unloaders Feb. 11, 1986
4566867 Dual diaphragm pump Jan. 28, 1986
4561463 Sectional valve having dual pressure relief Dec. 31, 1985
4561521 Variable assist power steering system Dec. 31, 1985
4520902 Lubricant applying system and injector means Jun. 4, 1985
4518004 Multifunction valve May. 21, 1985

1 2 3










 
 
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