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8156962 Microvalve device  
A microvalve device for controlling fluid flow includes a body defining a chamber having first and second ends. The first end is in communication with a source of command pressure. The second end...
8156960 Servo pressure control valve  
A valve for controlling pressure in a system is provided. The valve includes a housing, a servo spool and a piston positioned within the housing with the piston and the servo spool being movable...
8069928 Percussion device, drilling machine including such a percussion device and method for controlling such a percussion device  
A percussive device and method having, inside a machine housing (3), a reciprocally moveable percussive piston (2), the movement of which is controlled by a control valve (5), which is arranged to...
8011387 Pressure control device for heavy equipment  
A pressure control valve for heavy equipment. The pressure control valve can smoothly operate a working device having a high load pressure by limiting a supply of hydraulic fluid to a working...
7909060 Pressure control valve  
A pressure control valve includes a sleeve on which an input port, an output port, and drain ports are formed; and a linear solenoid portion for generating thrust. The pressure control valve...
7832427 Control valve arrangements  
A valve arrangement includes a valve member, which rotates continuously in one sense. The generally cylindrical head of the valve member, within the housing, is formed to co-operate with various...
7828245 Dual motor dual concentric valve  
An actuator control system has a dual concentric servo valve having a spool and at least one motor adapted to selectively displace the spool.
7793912 Fluid pressure actuated poppet valve  
In a valve body, an input chamber is located between a small diameter slide hole, which slidably supports a small diameter portion of a slidable valve, and a large diameter slide hole, which...
7757714 Two-stage servo-valve  
A two-stage servo-valve has a first stage in which four flow resistances are arranged in a bridge circuit. At least one of the flow resistances is variable, and two opposite switching points of the...
7735517 Rotary-actuated electro-hydraulic valve  
A valve for controlling fluid flow in a fluid system is disclosed. The valve includes a housing, a servo spool, and a piston. The servo spool defines a spiral groove and a spiral land. The piston...
7237470 Fluid power unit having closed circuit  
A fluid power unit has a cylinder in a housing, a piston slidable in the cylinder and dividing the cylinder into a retract side and an extend side, and a two-position control valve. The control...
6983623 Valve block assembly for I.S. glassware machine and modular pilot valve operated poppet valve assembly  
A valve block assembly includes a cartridge block and a plurality of modular pilot valve operated poppet valve assemblies. The cartridge block has a plurality of bores therein dimensioned and...
6957664 Pilot control valve  
The present invention relates to a pilot control valve, especially for use in mining hydraulics. The valve has a valve insert constructed as a valve cartridge, whose single or multipart valve...
6766828 Interlock valve  
An interlock valve is formed by incorporating a main valve portion having a valve member into a first casing, incorporating a driving-side operating portion 2 having a driving piston for driving...
6755761 Microvalve for electronically controlled transmission  
A microvalve device for controlling fluid flow in a fluid circuit. The microvalve device comprises a body having a cavity formed therein. An electronically controlled automatic transmission,...
6422254 Hydraulic control cold start neutral valve  
A hydraulic neutral cold start control valve for a variable displacement hydraulic unit includes a housing with a spool bore and an intersecting signal pressure passage therein. A spool is disposed...
6305419 Variable pilot pressure control for pilot valves  
A hydraulically operated industrial machine has hydraulic work components such as a boom, bucket or the like, and also uses hydraulic motors for propelling the machine. The motors and cylinders are...
6241487 Fluid powered diaphragm pump  
A fluid powered diaphragm pump is provided which includes three means for supplementing the pilot valve signal to the main fluid valve spool. The means include a cross porting of the main fluid...
6192936 Hydraulic control means  
A hydraulic remote control (HRC) valve including a main spool valve and a pilot pressure control valve. A lever is operatively connected to the pilot valve whereby to provide "finger tip" control...
6186045 Latching valve and a multiplexed hydraulic control system utilizing same  
A latching valve, useable in a multiplexed fluid control system, is switchable between two positions to control working output fluid flow to a corresponding actuator. The valve is latched by...
6038957 Control valves  
A hydraulic control valve (10; 110) which acts as a hydraulic flow amplifier. An obturator (34; 134) is slidable towards and away from a valve seat (36; 136) to controllably vary throughflow from...
5996627 Adjustable fluid valve for diaphragm pumps  
A fluid diaphragm pump is provided with a means for controlling the flowrate of fluid to the main fluid valve. Specifically, in the main fluid valve, a sleeve accommodates a sliding spool. The...
5975139 Servo control valve for a hydraulically-actuated device  
A servo control valve includes a valve body that defines a high pressure passage, a low pressure passage and a flow passage. A valve member has a first pressure surface in opposition to a control...
5743297 Detent arrangement for holding hydraulic valve member stroked  
A hydraulic pilot valve has a joystick which is normally maintained in a neutral position by coil springs acting on plungers which engage corresponding first cam surfaces of a cam fixed to the...
5683071 Apparatus for controlling selectively engageable detents in a pilot controller  
A pilot hydraulic system controller including a pilot controller valve for controlling the flow of hydraulic fluid to actuate a primary hydraulic system valve, a pilot controller lockout valve, and...
5494075 Hydraulic time delay valve  
A hydraulic time delay valve includes a hydraulic timer valve having a valve pressure port, a valve return port, a valve cylinder port and a porting device for porting hydraulic fluid from the...
5353686 Hydraulic circuit for four-position closed-center selector valve controlled by pressure proportional control valve  
A hydraulic circuit, having a four-position closed-center valve (6) controlled by a proportional control valve (22), can facilitate the vertical position control and operating speed control of a...
5313983 Remote hydraulic control systems  
Response times for a remote hydraulic control system having control lines from a remote controller to a main control valve of 50 feet or more are reduced by providing actuator pistons which are...
5279121 Flow control valve with pilot operation and pressure compensation  
A pilot-actuated, pressure-compensated flow and directional control valve assembly (11) is provided in which a main valve spool (95) is positioned in response to a pressure differential between a...
5253808 Power assisted dump valve  
A power assisted dump valve for a high pressure nozzle system. The dump valve is formed from a unitary housing or valve body. A valve chamber in the valve body includes a slidable piston which, in...
5172726 Pressure regulator  
The pressure regulator comprises a valve with a slide member (5) whose displacements are controlled by the pressure prevailing in the control chamber (7). This pressure is adjusted by an obturator...
5136898 Hydraulic system for controlling engagement of frictional coupling in automatic transmission  
In order to improve only a pressure variation characteristic of hydraulic fluid supplied to a hydraulically actuable frictional coupling, but also a pressure variation characteristic thereof...
5129500 Control valve for timed clutch engagement  
A control valve assembly has a multi-land spool valve slidably disposed in a stepped valve bore. One end of the spool valve has disposed adjacent thereto a control chamber in which a control signal...
5117868 Pilot-controlled directional valve  
Pilot-controlled directional valve having two positions, an admitting position and a closing position for a hydraulic user device, such closing position can be obtained independently from the...
5095806 Device in a hydraulic power system connected to a load driving hydraulic motor  
Device in a hydraulic power system connected to load driving hydraulic motor (18; 32), comprising a pilot controlled flow regulating directional valve (1; 29) for alternative connection of the...
5081905 Hydraulic pilot operation circuit and valve for quickly discharging oil  
A hydraulic control valve is controlled and changed over by a hydraulic pressure output from a remote control valve. A change-over valve is provided between an output port of the remote control...
5056561 Remote controlled, individually pressure compensated valve  
A remote controlled individually pressure compensated hydraulic valve assembly includes a directional valve having an inlet, a load holding check valve, an outlet passage, at least one outlet or...
5038825 Multiport valve  
In a hydraulically operated multiport valve having a floating position for connecting the cylinder chambers of a hydraulic piston-cylinder drive, a valve slide and a restraining piston associated...
5022359 Actuator with energy recovery return  
An electronically controlled actuator which compresses a fluid thereby storing potential energy as it transitions from a first to a second position is disclosed. The compressed fluid exerts a high...
4966196 Balanced servo-operated multiway valve  
A servo-operated multiway valve is disclosed which can be optionally used as both a pressurization valve and a ventilation valve for use with a fluid consuming device. The valve utilizes a valve...
4964424 Pneumatic valve assembly for controlling a stream of compressed air  
This invention relates to a pneumatic valve assembly for controlling a compressed air stream in response to a non-contacting actuation. It is desired to provide such a valve assembly which is...
4926905 Manually operated air valve and actuator in combination control a hydraulic spool valve for maneuvering heavy equipment  
A proportional remote control having an air regulating controller and an air operated actuator that have matched components to provide a true linear control of the displacement of a valve spool in...
4858649 Valve apparatus  
A valve apparatus (1; 50; 60, 61; 90; 100) in which at least one flow control valve (21, 22; 63, 76; 101) is incorporated in a body block (20; 62, 82), and the flow control valve is connected in...
4833798 Hydraulic control for earth working machines  
The hydraulic control is constructed for time-sharing of the pump which normally controls the turning mechanism, to operate other hydraulic equipment in conjunction with other pumps.
4799420 Load responsive control system adapted to use of negative load pressure in operation of system controls  
A load responsive control system using on a selective basis the energy derived from a negative type load for operation of system controllers, which may be of various types, including...
4785849 Pressure reducing valve assembly  
A pressure reducing valve assembly comprising a main valve (11) and a pilot valve (22), wherein a cylindrical chamber (12) of the main valve (11), which has annular grooves (17, 16, 15) provided...
4779648 Pilot controlled valves  
A new pilot valve for spool-type valves and cartridge-type valves is disclosed. In both types of valve, the valve body (spool or cartridge) is provided with a cylindrical bore and first and second...
4762147 Servo valve with torque feedback  
A servo valve assembly having torque feedback includes a housing and a valve spool disposed for axial translation therein. The valve spool has a plurality of lands alternating with three reduced...
4741364 Pilot-operated valve with load pressure feedback  
A pilot-operated electrohydraulic valve has a pilot valve member exposed to load pressure via a load pressure feedback passage. Part of the pilot valve member forms a feedback valve which closes...
4736773 Electronically switched pneumatic valve system  
An electronically actuated switching valve for controlling the flow of gas streams in a pneumatic system. The preferred embodiment of the invention comprises a double piloted three-way spool valve...
Matches 1 - 50 out of 230 1 2 3 4 5 >