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7444920 Valve arrangement for the activation of a structural element  
The valve arrangement for the activation of a structural element has three inlet switching valves through which a pressure-loaded medium can be conducted. These inlet switching valves are connected...
7089957 Redundant valve system  
The redundant valve system 10 of the preferred embodiment includes a first valve unit 12 and a second valve unit 14 . The redundant valve system 10 is preferably used to connect a source 16...
6851350 Valve device for a control cylinder  
For a valve arrangement of a pneumatically actuated, spring-loaded control cylinder, a non-return valve in pneumatic communication with the control cylinder piston chamber. At very low...
5746108 Hydraulic control system of transfer system for machine tools  
Disclosed is a hydraulic control system of a transfer system for a machine tool, including a hydraulic pump for generating hydraulic pressure, a first directional control valve for controlling the...
5577876 Hydraulic interblock system  
A control apparatus controls movement of a lift arm and tool on a skid steer loader. Power actuators are coupled to the lift arm circuit and the tool circuit for moving the lift arm and tool along...
5531286 Assisted steering mechanism, in particular for motor vehicles  
An auxiliary power steering unit, especially for motor vehicles, contains a control valve (1) made as a rotary slide valve for controlling a pressure medium conveyed by a servopump (3) out of a...
5481874 Exhaust pressurizing circuit including flow amplification  
An exhaust manifold (25) of a fluid power and control system, the pressure of which is varied when the fluid motor (10) is subjected to a bidirectional positive or negative type load (W). This...
5364231 Full authority propeller pitch control  
A control for a hydraulic propeller pitch actuator includes a low power pilot valve responsive to digital electronic input signals to control movement of a hydraulic servomotor driving a higher...
5323687 Hydraulic circuit  
A hydraulic circuit for a backhoe loader having two double-acting cylinders for the arm and bucket of the loader and respective directional valves for the cylinders. There are heavy demands on the...
5232410 Rotational speed differential responsive type control coupling  
A pair of orifices of different orifice sizes is provided between each pressure chamber and an accumulator chamber. A larger one serves as a variable orifice and a smaller one as a fixed orifice....
5159872 Valve units for use in hydraulic control systems of mining equipment  
A valve block in a mine hydraulic system contains a non-return valve which is opened when a hydraulic control signal occurs to connect a pressure fluid feed or return line to a working chamber of...
5142963 Load referenced pressure reducing valve  
A load-referenced, pressure reducing valve, and a system which incorporates one or more of such valves provide needed response to rapidly changing hydraulic system load demands which are...
5081902 Apparatus for providing relief to a working chamber  
For the relief of a highly pressurized hydraulic liquid in a working chamber of pilot controlled 2/2 poppet valve is used. The working chamber is further connected to a pressure relief valve, the...
4799418 Vacuum actuator for vehicle speed control  
Disclosed is a pressure actuator such as a vacuum actuator comprising a valve unit including a plurality of solenoid valves and a diaphragm unit including a diaphragm defining a pressure chamber,...
4756233 Air filter system for a vacuum actuator  
Disclosed is an air filter unit for a pressure actuator such as a vacuum actuator for a speed control of an automobile comprising a solenoid valve unit including a plurality of solenoid valves and...
4682629 Electromagnetic proportional valves  
An electromagnetic proportioning valve is provided having two coils and an armature which can be displaced by either coil in one of two possible directions, in which case a seat valve on whose...
4672885 Servo device for controlling flow in a hydraulic installation, particularly for the assisted steering of a vehicle  
The servo device for controlling flow (10) situated in a branch hydraulic line (6), incorporates in a body (11) an inlet passage (12) and an outlet passage (9) connected by an intermediate passage...
4630527 Electro-hydraulic height corrector for motor vehicles  
An electro-hydraulic height corrector for motor vehicles comprising a hydraulic distributor having ducts connected, one to a pressurized supply source, another to suspension cylinders and another...
4590966 Control-valve system and block for a fluid-operated cylinder-and-piston assembly  
A control valve includes a monolithic valve body incorporating dual digital valves and dual by-pass valves interconnected with each other by ducts within the valve body and providing for either...
4585024 Air shift conversion apparatus for manual valves  
An air actuator device is provided for manually operable hydraulic valves having a valve spool moving in a bore in a valve housing in the form of an actuator housing adapted for attachment on the...
4517877 Step control apparatus for a fluid motor  
Step control apparatus for a fluid motor includes a plurality of devices each responsive to an external signal for initiating movement of the fluid motor. Also included is a mechanism for stopping...
4412415 Hydrostatic steering gear  
The invention relates to a hydraulic steering system of the type having a servomotor controlled by a steerable valve assembly which directs metered quantities of pressurized fluid to the servomotor...
4409887 Hydraulic apparatus  
In a hydraulic apparatus, an operating oil delivered from a fixed delivery hydraulic pump is divided into two parts, one of which is discharged into an oil tank by passing through a serial circuit...
4401009 Closed center programmed valve system with load sense  
A closed center programmed valve system having a load sense fluid source for control of the raising and lowering of load means by a raise and a lower normally closed two stage valve assembly. Each...
4373874 Fluid actuated pump system  
A pump system includes a source of fluid under pressure conveyed into a fluid chamber containing meshing gears which are rotated by the pressurized fluid to, in turn, transmit rotation to a unitary...
4368805 Hydraulic control unit for elevators  
A control unit for a hydraulic actuated elevator consists of a valve device in the hydraulic circuit wherein the circuit includes a pump, a hydraulic cylinder and its piston for raising and...
4354526 Control valves  
A valve structure is provided for use in an integral hydraulic pump and valve assembly having a housing adapted to be integral with a pump housing with spaced apart low pressure and high pressure...
4348945 Device for controlling a hydraulic power circuit  
The control device is applicable as a hydraulic regulating valve for controlling a power lift unit of a tractor and comprises a mechanically actuated preliminary selector valve operable for...
4345736 Solenoid operated valve and dashpot assembly  
A dashpot assembly has a movable cylindrical element mounted within a housing. The movable element has a chamber with a first opening for restricting flow of fluid into the chamber and a second...
4345507 Elevator fluid flow control valve  
A fluid flow control valve system to be used to control a hydraulic lifting mechanism used on elevators and the like. The valve system includes an inlet conduit from the pump and an inlet-outlet to...
4307750 System for precise position control  
A hydraulic system for precise positioning of a control device, such as a valve actuator. A double-acting, hydraulic cylinder, which operates the control device, is held in any set position by a...
4280397 Hydraulic fluid control apparatus  
The hydraulic fluid control apparatus has velocity control means and pressure control means. The apparatus has hydraulic fluid entry means for receiving hydraulic fluid and hydraulic fluid...
4276810 Programmed valve system used for positioning control  
A programmed valve system for positioning control having a first two stage valve assembly operable for raising a load and a second two stage valve assembly for lowering the load. Each of the second...
4214506 Hydraulic control arrangement with at least one multiple position valve  
A hydraulic control arrangement for hydraulic consumer includes a multiple position valve having a control slide movable by proportional magnets between a neutral position and a plurality of...
4202250 Programmed unbalanced load valve system  
A valve system for an unbalanced load having a first two stage valve assembly operable for raising the load and a second two stage valve assembly for lowering the load. Each of the second stages...
4152970 Fluid pressure supply apparatus  
A fluid pressure supply apparatus includes a fluid pressure source, a fluid supply circuit to receive fluid under pressure from the fluid pressure source, and a fluid return circuit. These circuits...
4146053 Fill and vent valve assembly  
A fill and vent valve assembly has a bore in a first member and a cylindrical stem of a second member positioned within the bore. A blind bore extends inwardly from an inner end of the stem and has...
4119016 Hydraulic control device  
A hydraulic control device for use in a hydraulic system having a pump supplying fluid from a reservoir to a working circuit. The control device detects leaks in the working circuit by monitoring...
4066148 Hydraulically-actuatable elevator system  
Generally described is a hydraulically-actuatable elevator system wherein the vertically reciprocatable cargo-carrying carrier member is suspended from a lofty superstructure by at least one...
4023466 Apparatus for regulating the speed of and the pressure of fluid upon the ram in the injection assembly of an injection molding machine  
An injection molding machine wherein the ram in the injection cylinder can be moved at several speeds and can be subjected to different fluid pressures by an apparatus having a two-way valve whose...
4020748 Valve structure for hydraulic control system  
A valve piston in an automotive power-steering system has a pair of inner peripheral grooves, defined by confronting lands of adjoining piston heads, normally communicating with the high-pressure...
4019845 Control system for injection-molding machine  
An injection-molding machine has a drive ram with a pressurizable chamber that can be connected either to the high-pressure side or the low-pressure side of a source of fluid under pressure. A...
4018136 Hydraulic apparatus for controlling movement of a member under loading  
Disclosed herein is an apparatus including a member mounted on a frame and biased for movement in one direction, a hydraulic cylinder-piston assembly connected between the frame and the member and...
4007664 Hydraulic booster  
A hydraulic booster has its piston located in a normal passive position so that hydraulic fluid supplied to the cylinder through an inlet port enters the cylinder on both sides of the piston....
3984648 Circuit breaker actuating device  
A circuit breaker actuating device comprising valve means interposed between a high pressure section of an operation fluid and a low pressure section thereof to preclude communication therebetween...
3983790 Brake actuator  
A brake actuator for a vehicle having air brakes is disclosed in which air pressure is expelled through the actuator upon release of the brakes in order to purge the latter of contaminants. The...
3974742 Lock valve assembly  
A lock valve assembly is provided in a hydraulic control system for a double acting hydraulic jack which is adapted to permit the desired substantially unrestricted flow of inlet fluid selectively...
3973595 Arrangement for actuating mechanically independent valves in a pressure fluid system  
A hydraulic interlock arrangement for ensuring that an inlet valve is closed before a discharge valve is opened, and vice versa, each inlet or discharge valve having a hydraulic piston-cylinder...
3963047 Fill and relief valve arrangement  
A fill and relief valve arrangement for the introduction of fluid into and the selective venting of fluid from a fluid chamber includes a body having a stepped open-ended bore extending...
3924904 Grease fitting assembly including safety stop  
A grease fitting assembly is provided for introducing grease into the cylinder of a hydraulic track tension adjustor. The assembly includes a grease fitting which is threadably received in a bore...
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