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Class Information
Number: 91/454
Name: Motors: expansible chamber type > With motive fluid valve > Relatively movable inlet and exhaust valves for single working chamber
Description: Apparatus in which the valve means comprises two valves, each having a movable flow controlling part, one of the valves controlling the pressure line to a working chamber and the other controlling the exhaust line from the same chamber, at least one of the valves controlling its respective line by movement of its movable valve part relative to the movable valve part of the other valve.

Sub-classes under this class:

Class Number Class Name Patents
91/455 One valve forms unitary part of valve controlling opposed working chamber 26
91/456 One valve moves about an axis 1
91/457 Single actuating means moves both valves 54

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8479504 Hydraulic system having an external pressure compensator Jul. 9, 2013
8291925 Method for operating a hydraulic actuation power system experiencing pressure sensor faults Oct. 23, 2012
8096227 Hydraulic system having regeneration modulation Jan. 17, 2012
7908852 Control system for recovering swing motor kinetic energy Mar. 22, 2011
7874152 Hydraulic system with compensation for kinematic position changes of machine members Jan. 25, 2011
7874241 Electronically controllable and testable turbine trip system Jan. 25, 2011
7849686 Valve assembly and a hydraulic actuator comprising the valve assembly Dec. 14, 2010
7836690 Positioning control mechanism for double-acting air cylinder Nov. 23, 2010
7810585 Bi-directional rotary steerable system actuator assembly and method Oct. 12, 2010
7690196 Hydraulic actuator having an auxiliary valve Apr. 6, 2010
7677154 Control unit for rotor blade adjustment Mar. 16, 2010
7614336 Hydraulic system having augmented pressure compensation Nov. 10, 2009
7380398 Hydraulic metering mode transitioning technique for a velocity based control system Jun. 3, 2008
7269947 Vibration control method and vibration control system for fluid pressure control circuit Sep. 18, 2007
7270046 Integrated valve assembly and computer controller for a distributed hydraulic control system Sep. 18, 2007
7258058 Metering valve with integral relief and makeup function Aug. 21, 2007
7251935 Independent metering valve control system and method Aug. 7, 2007
7243493 Valve gradually communicating a pressure signal Jul. 17, 2007
7240604 Electro-hydraulic metering valve with integral flow control Jul. 10, 2007
7213502 Robustly stable servo-controlled metering poppet valve May. 8, 2007
7213612 High pressure ball-poppet control valve with flow control May. 8, 2007
7210396 Valve having a hysteretic filtered actuation command May. 1, 2007
7204185 Hydraulic system having a pressure compensator Apr. 17, 2007
7194948 Secondary pump of brake Mar. 27, 2007
7146902 Hydraulic directional converter Dec. 12, 2006
7059127 Hydro-pneumatic spring support arrangement Jun. 13, 2006
7028599 Control device for the continuous drive of a hydraulic control motor Apr. 18, 2006
6935107 Three-way pneumatic commutator and volume booster Aug. 30, 2005
6880332 Method of selecting a hydraulic metering mode for a function of a velocity based control system Apr. 19, 2005
6854268 Hydraulic control system with energy recovery Feb. 15, 2005
6837045 Electrohydraulic lifting control device for industrial trucks Jan. 4, 2005
6807892 Pneumatic actuator with elastomeric membrane and low-power electrostatic flap valve arrangement Oct. 26, 2004
6802242 Pneumatic circuit control system Oct. 12, 2004
6748738 Hydraulic regeneration system Jun. 15, 2004
6732512 Velocity based electronic control system for operating hydraulic equipment May. 11, 2004
6701822 Independent and regenerative mode fluid control system Mar. 9, 2004
6694860 Hydraulic control system with regeneration Feb. 24, 2004
6691603 Implement pressure control for hydraulic circuit Feb. 17, 2004
6691604 Hydraulic system with an actuator having independent meter-in meter-out control Feb. 17, 2004
6619183 Electrohydraulic valve assembly Sep. 16, 2003
6598391 Control for electro-hydraulic valve arrangement Jul. 29, 2003
6543223 Drive device Apr. 8, 2003
6540010 Device for hydraulically adjusting the rollers of strand guiding segments of a continuous casting installation Apr. 1, 2003
6467264 Hydraulic circuit with a return line metering valve and method of operation Oct. 22, 2002
6431207 High-pressure ball-poppet control valve Aug. 13, 2002
6431209 Multi-pressure ball-poppet control valve Aug. 13, 2002
6354185 Flow manager module Mar. 12, 2002
6349627 Electropneumatic positioner Feb. 26, 2002
6253659 Band controlled valve/actuator Jul. 3, 2001
6244048 Hydraulique drive device Jun. 12, 2001

1 2 3 4

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