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Class Information
Number: 91/465
Name: Motors: expansible chamber type > With motive fluid valve > For double-acting motor > Relatively movable unitary inlet and exhaust valves for opposed working chambers
Description: Apparatus in which the valve means comprises two unitary inlet and exhaust valves, each controlling the flow of motive fluid to and from its respective opposed working chamber, the control of motive fluid for each working chamber being effected by the relative movement of the unitary movable elements of the valves.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8695333 Method for when necessary automatically limiting a pressure in a hydraulic system during operation Apr. 15, 2014
8635939 Apparatus, a control circuit and a method for producing pressure and volume flow Jan. 28, 2014
8191456 Method of driving an hydraulic actuator by means of a pressure controlled proportioning solenoid valve Jun. 5, 2012
7540230 Three-way poppet valve for work exchanger Jun. 2, 2009
7243679 Adsorbent fractionator directional flow control valve assembly apparatus and method Jul. 17, 2007
7243591 Hydraulic valve arrangement Jul. 17, 2007
7216578 Hydraulic actuating device May. 15, 2007
6848641 Actuating valve for bidirectional pneumatic cylinder and use of such actuating valve for bobbin creels controlled by pneumatic cylinders Feb. 1, 2005
6786441 Bobbin creel for textile machines and actuating valve for adjusting such a bobbin creel Sep. 7, 2004
6688332 Multiway valve for switching a flow of fluid under pressure with parallel disposition of valve bores, and valve assembly kit Feb. 10, 2004
6626082 Table feed system Sep. 30, 2003
6557452 Valve and position control system integrable with clamp May. 6, 2003
6382076 Piston servo-actuation main system with hydromechanically self-contained detection May. 7, 2002
6230608 Vacuum actuated control mechanism May. 15, 2001
6220288 Electrohydraulic control device Apr. 24, 2001
6082243 Fluid controlled switching unit Jul. 4, 2000
6062260 Dual piston pilot valve May. 16, 2000
6047628 Control device for a steering system Apr. 11, 2000
6003428 Electro-pneumatic pressure control system for welding and like apparatus Dec. 21, 1999
5921165 Hydraulic control system Jul. 13, 1999
5887618 Fluid flow control valve device Mar. 30, 1999
5816131 Fluid-controlled actuator assembly Oct. 6, 1998
5743297 Detent arrangement for holding hydraulic valve member stroked Apr. 28, 1998
5737992 Method and device for controlling a double-acting cylinder actuated by a pressurized fluid Apr. 14, 1998
5664477 Control system for a hydraulic circuit Sep. 9, 1997
5644967 Servo valve arrangement Jul. 8, 1997
5638866 Detent arrangement for holding hydraulic valve members stroked Jun. 17, 1997
5575150 Stiffness enhanced electrohydrostatic actuator Nov. 19, 1996
5558004 Control arrangement for at least one hydraulic consumer Sep. 24, 1996
5522301 Pressure control valve for a hydraulic actuator Jun. 4, 1996
5427012 Electronically controlled fluid powered motor Jun. 27, 1995
5363739 Reduced icing low friction air valve Nov. 15, 1994
5317953 Neutral-centering valve control system Jun. 7, 1994
5277099 Reduced icing low friction air valve Jan. 11, 1994
5226346 Axial piston type pressure medium servomotor control device Jul. 13, 1993
5179887 Captive cylinder linear solenoid valve positioner Jan. 19, 1993
5179888 Split clamp linear solenoid valve positioner Jan. 19, 1993
5138838 Hydraulic circuit and control system therefor Aug. 18, 1992
5131318 Directional control valve for pneumatic cylinder Jul. 21, 1992
5115720 Hydraulic valve bank May. 26, 1992
5105622 Hydraulic unit for driving a tool Apr. 21, 1992
5058484 Electrohydraulic control arrangement for controlling a hydraulic drive Oct. 22, 1991
5029516 Pneumatically powered valve actuator Jul. 9, 1991
5016519 Linear drive May. 21, 1991
4991548 Compact valve actuator Feb. 12, 1991
4967702 Fast acting valve Nov. 6, 1990
4942852 Electro-pneumatic actuator Jul. 24, 1990
4915015 Pneumatic actuator Apr. 10, 1990
4899700 Pneumatically powered valve actuator Feb. 13, 1990
4878464 Pneumatic bistable electronic valve actuator Nov. 7, 1989

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