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Class Information
Number: 137/106
Name: Fluid handling > Self-proportioning or correlating systems > Supply and exhaust type > Reversing or 4-way valve systems
Description: Systems which include two outlets or receivers, one outlet or receiver being connected to the supply while the other is connected to the exhaust, the connections being reversed or changed in response to a means sensing a change in condition.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8443827 Controlling device for hydraulic consumers May. 21, 2013
8291925 Method for operating a hydraulic actuation power system experiencing pressure sensor faults Oct. 23, 2012
7748461 Method and apparatus for multi-drop tool control Jul. 6, 2010
7604022 Manual valve of hydraulic control system for continuously variable transmission Oct. 20, 2009
7165569 Safety shut-off device Jan. 23, 2007
6988508 Device and method for the pneumatic control, and regulation of hydraulic fluid flows Jan. 24, 2006
6976500 Valve combination for a fluid circuit with two pressure levels, particularly a combined cooling system/heat pump circuit Dec. 20, 2005
6878293 Automatic valve assembly for water circulation systems Apr. 12, 2005
6782910 Multi-function hydraulic valve assembly Aug. 31, 2004
6745789 Valve unit with an overridable check valve and a fluid power drive fitted therewith Jun. 8, 2004
6422834 Reversing valve for a diaphragm pump Jul. 23, 2002
6419463 Reversing valve for a diaphragm pump Jul. 16, 2002
6371156 No-bleed pilot for pressure regulating valve Apr. 16, 2002
6068013 Counter balance valve May. 30, 2000
6065288 Flow control valve and hydraulic system employing same May. 23, 2000
6029689 Counter balance valve Feb. 29, 2000
RE36342 Low deadband marine hydraulic steering system Oct. 19, 1999
5960814 Counter balanced locking valve Oct. 5, 1999
5875811 Counterbalance valve with improved relief pressure setting arrangement Mar. 2, 1999
5862828 Oscillating valve for a double acting operating cylinder Jan. 26, 1999
5791143 Flow control valve and hydraulic system employing same Aug. 11, 1998
5749390 Valve having four connection ports and two positions May. 12, 1998
5676169 Counterbalance valve Oct. 14, 1997
5579676 Hydraulic valve to maintain control in fluid-loss condition Dec. 3, 1996
5535773 Hydromechanical differentiating apparatus Jul. 16, 1996
5481871 Hydraulic steering system with spool pressure equalization Jan. 9, 1996
5468127 Pilot control valve having means for recovering exhaust fluids Nov. 21, 1995
5444979 Fluid passage control device for fluid pressure actuator Aug. 29, 1995
5400816 Pilot actuated override mechanism for holding valve Mar. 28, 1995
5349818 Low deadband marine hydraulic steering system Sep. 27, 1994
5309936 Poppet configuration for counterbalance valve May. 10, 1994
5183071 Counterbalance valve Feb. 2, 1993
5174322 Automatic two-position four-way pulsating valve Dec. 29, 1992
5113894 Counterbalance valve May. 19, 1992
5018935 Automatic pressure relief system for a hydraulic motor May. 28, 1991
4953579 Quick acting diversion valves Sep. 4, 1990
4914913 Load responsive flow amplified control system for power steering Apr. 10, 1990
4809549 Apparatus for metering, measuring, or dosing flowing media Mar. 7, 1989
4796656 Method and apparatus for causing a series of mechanical actions Jan. 10, 1989
4776773 Pilot control valve for controlling the pumping rate of an injection pump Oct. 11, 1988
4749055 Power steering assembly for a large vehicle Jun. 7, 1988
4669494 Hydraulic lock valve with partial return to tank for marine steering Jun. 2, 1987
4638924 Self mixing sprayer Jan. 27, 1987
4593712 Pilot control valve Jun. 10, 1986
4580590 Automatic air valve assembly Apr. 8, 1986
4513653 Automatic hydraulic reversing valve for a double-action working cylinder Apr. 30, 1985
4510846 Pneumatic actuator device Apr. 16, 1985
4494912 Energy conserving air pump Jan. 22, 1985
4462418 Unitized pneumatic cycling and timing system Jul. 31, 1984
4461314 Electrohydraulic valve Jul. 24, 1984

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