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Class Information
Number: 137/625.61
Name: Fluid handling > Systems > Multi-way valve unit > Supply and exhaust > Pilot-actuated > Variable orifice-type modulator
Description: Device wherein the valve actuating mechanism is connected to a fluid pressure line and responsive to pressure differentials therein to move the valve, and wherein the pilot includes a constantly discharging opening connected to the line, and a modulating restrictor adjacent the opening and movable to and from the opening to vary the rate of flow and modify the pressure to thereby actuate the valve.










Sub-classes under this class:

Class Number Class Name Patents
137/625.62 Opposed orifices; interposed modulator 60


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8567444 Accumulator assembly Oct. 29, 2013
8418722 Pressure-regulator servovalve with reduced leakage rate Apr. 16, 2013
8381761 Pressure management control valve assembly Feb. 26, 2013
8302629 Valve unit Nov. 6, 2012
7832427 Control valve arrangements Nov. 16, 2010
7779853 Proportional pressure control valve Aug. 24, 2010
7757714 Two-stage servo-valve Jul. 20, 2010
7343845 Fluid operated position regulator Mar. 18, 2008
7290565 Methods and apparatus for splitting and directing a pressurized fluid jet within a servovalve Nov. 6, 2007
6953057 Automatic transmission shift control solenoid and valve Oct. 11, 2005
6926033 Proportional pressure control valve Aug. 9, 2005
6814103 Solenoid valve, in particular, a pressure control valve Nov. 9, 2004
6786236 Electrohydraulic servo valve Sep. 7, 2004
6647965 Pump assembly and method Nov. 18, 2003
6615869 Solenoid valve Sep. 9, 2003
6571828 Proportional pressure control valve Jun. 3, 2003
6557822 Dynamically stable flow amplifying poppet valve May. 6, 2003
6460558 Pilot stage or pressure control pilot valve having a single armature/flapper Oct. 8, 2002
6405746 Proportional pressure control valve Jun. 18, 2002
6343621 Variable force solenoid control valve Feb. 5, 2002
6286535 Proportional pressure control valve Sep. 11, 2001
6223761 Proportional variable force solenoid control valve with armature damping May. 1, 2001
6196249 Pressure regulating method and apparatus Mar. 6, 2001
6109300 Proportional variable force solenoid control valve and transmission fluid control device Aug. 29, 2000
6029703 Pressure solenoid control valve with flux shunt Feb. 29, 2000
6021876 Electrical proportional pressure control valve Feb. 8, 2000
6019120 Single stage variable force solenoid pressure regulating valve Feb. 1, 2000
5996628 Proportional variable force solenoid control valve Dec. 7, 1999
5836335 Proportional pressure control valve Nov. 17, 1998
5741004 Shift valve for an automatic transmission used in automobiles Apr. 21, 1998
5651385 Servo drive operated by a pressure medium Jul. 29, 1997
5611370 Proportional variable force solenoid control valve and transmission fluid control device Mar. 18, 1997
5282604 Solenoid operated pressure regulating valve Feb. 1, 1994
5273297 Leveling system for vehicles Dec. 28, 1993
5253676 Low Bernoulli force control orifice Oct. 19, 1993
5217047 Solenoid operated pressure regulating valve Jun. 8, 1993
5186213 29 Feb. 16, 1993
5184644 Solenoid operated pressure regulating valve Feb. 9, 1993
5135070 Active hydraulic pressure control Aug. 4, 1992
5121769 Solenoid operated pressure regulating valve Jun. 16, 1992
5085400 Valve Feb. 4, 1992
5062454 Spool control valve Nov. 5, 1991
5060695 Bypass flow pressure regulator Oct. 29, 1991
5056561 Remote controlled, individually pressure compensated valve Oct. 15, 1991
5051631 Electromagnetic solenoid valve with variable force motor Sep. 24, 1991
5031663 Pressure control valve device Jul. 16, 1991
5026123 Flow control valve for antilock brake control device Jun. 25, 1991
4966195 Transmission pressure regulator Oct. 30, 1990
4959581 Servo valve having a piezoelectric element as a control motor Sep. 25, 1990
4947887 Proportional solenoid valve Aug. 14, 1990

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