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Class Information
Number: 91/433
Name: Motors: expansible chamber type > With motive fluid valve > Both inlet and exhaust controlled by motive fluid pressure in supply line or chamber
Description: Apparatus in which the valve means controls both the inlet and the exhaust to initiate flow of motive fluid to and from a single working chamber of the motor and the valve means is operated in response to variations in the pressure in either the pressure line supplying motive fluid to the motor or the working chamber or the motor itself to control both the inlet and exhaust of motive fluid.










Sub-classes under this class:

Class Number Class Name Patents
91/434 With manual valve actuating means responsive to motive fluid pressure (e.g., "feel", etc.) 108


Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8667885 Actuating device for a shift element of a transmission device which can be applied with an actuating pressure Mar. 11, 2014
8607917 Electrically-operated hydraulic actuator unit and hydraulic four-wheel-drive work vehicle Dec. 17, 2013
8534182 Valvetrain oil control system and oil control valve Sep. 17, 2013
8516944 Valve arrangement having individual pressure scale and load-lowering valve Aug. 27, 2013
8505291 Hydraulic system having load sensing capabilities Aug. 13, 2013
8375989 Method of operating a control valve assembly for a hydraulic system Feb. 19, 2013
8356544 Raising drive and method for controlling a raising drive Jan. 22, 2013
8327750 Valvetrain oil control system and oil control valve Dec. 11, 2012
8286652 Configurable active jerk control Oct. 16, 2012
8240241 Hydraulic drive system and diagnostic control strategy for improved operation Aug. 14, 2012
8061261 Antagonistic fluid control system for active and passive actuator operation Nov. 22, 2011
8033209 Lifting mechanism, and method for triggering a lifting mechanism Oct. 11, 2011
7954318 PTM self-bleed/failsafe open system for FWD and RWD Jun. 7, 2011
7930970 Control unit for work machine Apr. 26, 2011
7779863 Pressure control valve having an asymmetric valving structure Aug. 24, 2010
7591214 Driving motor controlling device of construction machine Sep. 22, 2009
7513188 Force-based power steering system Apr. 7, 2009
7509905 Pressure control valve having intrinsic mechanical feedback system Mar. 31, 2009
7444920 Valve arrangement for the activation of a structural element Nov. 4, 2008
7406982 Hydraulic system control method using a differential pressure compensated flow coefficient Aug. 5, 2008
7373869 Hydraulic system with mechanism for relieving pressure trapped in an actuator May. 20, 2008
7364004 Apparatus for use in turning steerable vehicle wheels Apr. 29, 2008
7353743 Multi-valve fluid operated cylinder positioning system Apr. 8, 2008
7308848 Pressure control valve having intrinsic feedback system Dec. 18, 2007
7296669 Simple action actuator with a hydraulic fast-opening valve for controlling a clutch Nov. 20, 2007
7284471 Pressure control valve having intrinsic mechanical feedback system Oct. 23, 2007
7263924 Hydraulic circuit and its valve gear Sep. 4, 2007
7252030 Hydraulic control circuit and method thereof Aug. 7, 2007
7219591 Hydraulic control arrangement May. 22, 2007
7216578 Hydraulic actuating device May. 15, 2007
7213502 Robustly stable servo-controlled metering poppet valve May. 8, 2007
7210396 Valve having a hysteretic filtered actuation command May. 1, 2007
7182194 Low power modulating clutch control system with combination accumulator and piston actuator Feb. 27, 2007
7178654 Low power modulating clutch control system Feb. 20, 2007
7159506 State detecting device for load element receiving load of working fluid and state detecting device for fluid pressure control circuit Jan. 9, 2007
7121187 Fluid powered control system with a load pressure feedback Oct. 17, 2006
7080589 Hydraulic cylinder Jul. 25, 2006
7021191 Accurate fluid operated cylinder positioning system Apr. 4, 2006
7010911 Fluid pressure control circuit Mar. 14, 2006
7007447 Actuator device with a multi-chamber housing Mar. 7, 2006
6877417 Fluid pressure circuit Apr. 12, 2005
6802241 Air balancing device Oct. 12, 2004
6796330 Pressure control apparatus for a torque-transmitting mechanism Sep. 28, 2004
6786129 Sensor for cylinder control, and cylinder device incorporating the same Sep. 7, 2004
6779558 Valve, especially a pressure control valve Aug. 24, 2004
6755214 Solenoid valve for reduced energy consumption Jun. 29, 2004
6732761 Solenoid valve for reduced energy consumption May. 11, 2004
6705079 Apparatus for controlling bounce of hydraulically powered equipment Mar. 16, 2004
6691603 Implement pressure control for hydraulic circuit Feb. 17, 2004
6662705 Electro-hydraulic valve control system and method Dec. 16, 2003

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