Patents
Sitemap › F15 - Fluid-pressure actuators; Hydraulics or pneumatics in general › F15B - Systems acting by means of fluids in general; Fluid-pressure actuators, e.g. servomotors; Details of fluid-pressure systems, not otherwise provided for › F15B 13 - Details of servomotor systems
Patents for F15B 13 - Details of servomotor systems (18,792)
05/1991
05/16/1991WO1991006903A1 Steering and transmission shifting control mechanism
05/16/1991DE4035775A1 Hydraulic machine regulation and monitoring procedure - evaluating detected oil flow values at outlet of electrically controlled pre-control valve
05/15/1991EP0427165A1 Hydraulic system, especially valve arrangement for an actuator supplied by a pump
05/14/1991US5014824 Hydraulic elevator control valve
05/10/1991CA2029008A1 Automatic pressure relief system for a hydraulic motor
05/08/1991EP0425684A1 Valve apparatus and hydraulic drive system
05/07/1991US5012836 Servovalve apparatus for use in fluid systems
05/03/1991CA2067568A1 Steering and transmission shifting control mechanism
05/02/1991WO1991005958A1 Hydraulic driving apparatus of civil engineering/construction equipment
04/1991
04/30/1991US5012144 Linear direct drive motor
04/24/1991EP0423362A1 Counterbalance valve
04/24/1991EP0423343A1 Abnormal pressure prevention-vacuum prevention valve
04/23/1991CA1283342C Power transmission
04/18/1991DE3933393A1 Minimum element directional control valve - makes use of lower pressure to activate piston
04/16/1991US5007459 Hydraulic control system
04/09/1991US5005600 Servovalve apparatus for use in fluid systems
04/09/1991US5005467 Pilot-operated flow controlling directional control valve with copying spool
04/09/1991US5005358 Hydraulic drive system for crawler-mounted construction vehicle
04/04/1991DE3931509A1 Magnetically operated three=way valve - has centring springs for valve control piston incorporated in opposing operating magnets
03/1991
03/20/1991CN2073504U Throttling automatic controlled direction-changing valve
03/19/1991US5000226 Circuit assembly
03/19/1991US5000001 Dual load-sensing passage adjustable relief valves for hydraulic motor control
03/13/1991EP0416130A1 Hydraulic valve capable of pressure compensation
03/12/1991CA1281259C Load sensing circuit of load responsive direction control valve
03/07/1991WO1991002903A1 Hydraulic circuit device
03/07/1991WO1991002902A1 Valve device and hydraulic circuit device
03/06/1991EP0415133A1 Hydraulic circuits for actuators
03/06/1991CN2072613U Membrane nonlinear flow back coupling electrolyte proportion valve
03/06/1991CN2072612U Improved structure hydraulic integrated block
03/05/1991US4997159 Logic valve
03/05/1991US4997002 Power transmission
03/01/1991CA2021922A1 Powers transmission
02/1991
02/27/1991EP0413960A1 Solenoid valve
02/27/1991EP0281635B1 Valve device
02/27/1991CN2072164U Valve for backing tractor and unloading
02/26/1991US4995424 Directional control valve
02/26/1991CA1280785C Method and system employing strings of opposed air- inflatable tension actuators in jointed arms, legs, beams and columns for controlling theirmovements
02/21/1991DE3926847A1 Hydraulic control valve for water hydraulics - involves two=part valve body with plunger and sleeve
02/21/1991DE3926846A1 Piston slide valve for water hydraulics - makes use of ceramic for piston and housing bush
02/14/1991DE3918926A1 Constant pressure flow control valve - has tubular valve spool sliding over fixed sleeve with high pressure sealing surfaces of equal dia.
02/13/1991EP0412871A1 Control valve assembly for pressurized oil
02/13/1991CN2071271U Back pressure self-adjusting composite valve and hydraulic drive system
02/06/1991EP0411808A1 Logic valve
02/06/1991CN1011526B Hydraulic transmission system
02/05/1991US4990842 Operation control method and device for construction machine
02/05/1991US4989495 Hydraulic positioning system with normal and high supply and exhaust flow paths
01/1991
01/31/1991DE3941690C1 Hydraulic control of valve - incorporates clamp actuator with its own control valve
01/30/1991CN2070376U Relief valve for air pump
01/29/1991US4987927 Direct-drive valve
01/29/1991CA1279553C Alternating valve
01/22/1991US4986305 Fluidic multiplexer
01/22/1991US4986165 Hydraulic shovel control circuit with operating pattern switching valve
01/22/1991CA1279231C Load responsive system having synchronizing systems between positive and negative load compensation
01/16/1991EP0370070A4 Synthetisized flow-control servovalve
01/15/1991US4984505 Multiplexed hydraulic control systems
01/15/1991US4984427 Control circuit for hydraulic actuator
01/10/1991WO1991000432A1 Hydraulic circuit
01/10/1991WO1991000431A1 Hydraulic circuit for operating cylinder of working machine
01/02/1991EP0405113A1 Hydraulic control device
01/02/1991EP0404956A1 Oil pressure feeder of work machine cylinder
01/02/1991CN2068618U Proportional pressure front guide valve
01/02/1991CA1278494C Load responsive control system adapted to use of negative load pressure in operation of system controls
01/01/1991US4981159 Controlling flow of oil
12/1990
12/27/1990CA1278360C Load sensing circuit of load compensated direction control valve
12/20/1990DE3919413A1 Positional control valve units - can be assembled using stiffeners in connecting bolt region
12/19/1990CN1047909A Method to make independent from piston wear fluid tight seal of inlet and outlet ports of fluid in hydraulic appliance
12/19/1990CN1010875B Valve manifold stacking base
12/12/1990EP0401607A1 Method for manufacturing a microvalve and microvalve
12/12/1990CA2006780A1 Hydraulic control valve
12/06/1990DE3917528A1 Electrical control of solenoid-actuated hydraulic valves - has stacked construction with control unit located on top of unit
12/06/1990DE3917418A1 Electrohydraulic control valve - has fail-safe position provided by fluid pressure acting on sliding control piston
11/1990
11/29/1990DE3915913A1 Spring loaded hydraulic control valve - has spring loaded movable control element sliding in bush in which element is subject to effect of number of springs
11/28/1990EP0399044A1 Hydraulic servo valve
11/28/1990CN1010607B Direction controlling valve with hydraulic pilot valve
11/27/1990US4972761 Hydraulic safety brake valve arrangement for load lowering
11/27/1990CA1276858C Load compensated valve
11/20/1990US4971115 Four-way poppet valve with hollow stem and four-port body
11/15/1990WO1990013766A1 Pilot valve
11/15/1990WO1990013749A1 Electromagnetic directional control valve
11/15/1990WO1990013748A1 Hydraulic driving device of construction equipment
11/15/1990DE3915652A1 Hydraulic control for spool valve unit - makes use of throttles to reinforce spring action
11/14/1990EP0396760A1 Operation valve device
11/13/1990US4969487 Solenoid valve
11/07/1990CN1010340B Fluid supply device
11/06/1990US4967554 Commonly-piloted directional control valve and load pressure signal line relieving switching valve
11/03/1990CA2013481A1 Load responsive flow amplified control system
11/01/1990WO1990012973A1 Counterbalance valve
10/1990
10/31/1990EP0395611A1 Hydraulic valve
10/31/1990DE3914094A1 Solenoid valve for pressure medium vehicle brake system - provided with cylindrical seating body located in bore, with seat arranged on same axis as magnetic armature
10/31/1990DE3913870A1 Direction control valve for machine tool - arrangement of control piston to reduce flow losses
10/31/1990CN1010242B 3 position -5 way valve unit
10/30/1990US4966065 Multiplexed hydraulic control systems
10/23/1990US4964273 Subplate-mounted control valves in convertible oscillator drive system
10/18/1990WO1990012232A1 Valve for pressure medium
10/18/1990WO1990012212A1 Hydraulic circuit of closed center load sensing system
10/11/1990DE3911560A1 Hydraulic control arrangement
10/11/1990DE3911204A1 Directional control valve
10/11/1990DE3910913A1 Pneumatic or hydraulic valve with electromagnetic operating block
10/11/1990DE3910895A1 Control arrangement independent of load for hydraulic consumers
10/10/1990EP0391397A1 Education hydraulics device
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