Including motive fluid pressure or flow responsive valve (468)

A hydraulic pressure regulating system for a vehicle having a regulator valve, a shift valve and a plurality of fluid actuated clutch means, wherein an accumulator being provided between the regulator valve and the shift valve is so designed as to control the fluid pressure to keep it relatively low...     

The invention relates to a hydraulic steering apparatus comprising a continuously operating pump, an operating motor for controlling the parts to be steered, a control device which is adjustable by the steering wheel and which, in its neutral position, connects the pump to a tank through a short-circuiting...     

A valve section which establishes priority flow in a valve assembly having a plurality of directional control open-center valves each for controlling flow between an associated hydraulic motor and a common power passage from a single source of motive fluid, wherein flow to one of the motors is afforded...     

A hydraulic control arrangement for control of fluid flow to a consumer device and comprising a three-position valve having a valve member movable between a neutral position closing at least one conduit leading to the consumer device and two working positions in one of which it connects the consumer...     

A load responsive direction and flow control valve for use in fluid power load responsive system. The valve maintains a selected constant flow level for control of both positive and negative loads, irrespective of the change in the load magnitude or change in the fluid pressure, supplied to the valve....     

The piston of a fluid ram is provided with an end of stroke braking means comprisng a pusher adapted to contact the end wall of the ram cylinder as the piston approaches the end wall to restrict the flow of fluid from the outlet chamber of the ram to an outlet part. As the ram moves nearer the end the...     

A load responsive direction and flow control valve for use in fluid power load responsive system. The valve maintains a selected constant flow level for control of both positive and negative loads, irrespective of the change in the load magnitude or change in the fluid pressure, supplied to the valve....     

A servoactuator for stopping a ram in its existing position or retracting the ram at a fixed rate to a locked position.

A load responsive direction and flow control valve for use in fluid power load responsive system. The system is powered by a single fixed or variable displacement pump. The valve maintains a selected constant flow level during control of positive loads and automatically blocks pump flow to the actuator...     

A load responsive direction and flow control valve for use in fluid power load responsive system. The valve maintains a selected constant flow level for control of both positive and negative loads, irrespective of the change in the load magnitude or change in the fluid pressure, supplied to the valve....     

A hydraulic valve includes a valve body which is provided with a fluid inlet chamber, a pair of user chambers arranged for communication with users of the fluid admitted into the valve body and a pair of return chambers for recovering fluid from the users and recycling the fluid to a source of the same....     

A servoactuator for stopping a ram in its existing position or retracting the ram at a fixed rate to a locked position.

A load responsive fluid power multiple load control system using load responsive direction and flow control valves in combination with pump flow control responding to highest system load. Each direction flow control valve is equipped with a load responsive negative load control. The negative load responsive...     

A load responsive direction and flow control valve for use in fluid power load responsive system. The valve maintains a selected constant flow level for control of both positive and negative loads, irrespective of the change in the load magnitude or change in the fluid pressure, supplied to the valve....     

A load responsive direction and flow control valve for use in a fluid power load responsive system. The valve maintains a selected constant flow level for control of both positive and negative loads in parallel or series type circuits, irrespective of the change in the load magnitude or change in the...     

An hydraulic power system comprising a dual acting work piston adapted to be operatively connected to an external mass to be moved, the piston being instantly directionally responsive to a pair of control valves adapted to be sequentially opened and closed to actuate the work piston for movement in opposite...     

A control valve having a rotor for communicating outlet port or ports selectively to fluid drain port or to inlet port so as to change flow direction of fluid to be supplied to fluid operated apparatus. The control valve comprises first and second pistons inserted in a hollow space of the rotor and a...     

A pressure operated shut-off valve for controlling a pneumatic circuit for instance a supply passage of a pneumatic tool, in response to the motive air supply pressure. The valve comprises a valve body that is continuously biased in its closing direction by a spring means and in its opening diection...     

A load responsive fluid power multiple load control system using load responsive direction and flow control valves in combination with pump control responding to highest system load. Each direction flow control valve is equipped with a load responsive pressure control which automatically regulates valve...     

A load responsive fluid power multiple load control system using load responsive direction and flow control valves in combination with pump control responding to highest system load. Each direction flow control valve is equipped with a load responsive pressure control which automatically regulates valve...     

A pressure compensating valve spool assembly for a hydraulic flow control valve the spool assembly being slidably positioned in the central bore of a valve housing for movement from a neutral position wherein fluid will flow through the valve assembly to reservoir to operative positions in either direction...     

A load responsive fluid power multiple load control system using load responsive direction and flow control valves in combination with pump control responding to highest system load. Each direction flow control valve is equipped with a single load responsive controller which automatically regulates fluid...     

A direction flow control valve for control of positive and negative loads equipped with a load responsive positive load control which automatically regulates valve inlet pressure to maintain a relatively constant pressure differential between inlet pressure and load pressure. The load responsive control...     

A self-depressurizing hydraulic control valve having a sliding-type metering valve to control the flow of hydraulic fluid through the valve and also a shutoff valve to stop the flow automatically. The shutoff valve is responsive to the rate of flow of fluid through the control valve and stops the flow...     

A pressure responsive check valve permits fluid flow therethrough in a first direction and blocks fluid flow therethrough in the reverse direction until the fluid pressure at the blocked side exceeds a preselected pressure level at which time the check valve is controllably opened for reverse flow therethrough.

Instrumentality for use in multiple spool control valve assemblies including a high pressure pilot operated relief valve that exhausts fluid from the chamber being protected through a pair of exhaust passages simultaneously. A pressure responsive flow restricting valve maintains a constant pressure differential...     

A load responsive fluid power multiple load control system using a first type of load responsive direction control valves responding to upstream pressure differential between inlet and load chambers together with a second type of load responsive direction control valves responding to down stream actuator...     

A load responsive fluid power multiple load control system using load responsive direction and flow control valves in combination with pump control responding to highest system load. Each direction flow control valve is equipped with a load responsive pressure control which automatically regulates valve...     

A load responsive fluid power multiple load control system using load responsive direction and flow control valves in combination with pump control responding to highest system load. Each direction flow control valve is equipped with a load responsive pressure control which automatically regulates valve...     

A hydraulic valve system particularly adapted for controlling a hydraulically powered elevator. The system involves essentially a bypass valve which selectively bypasses hydraulic fluid from the pump directly back to the tank during the up mode operation, thereby controlling the up speed of the elevator;...     

A hydraulic valve system particularly adapted for controlling a hydraulically powered elevator. The system involves essentially a bypass valve which selectively bypasses hydraulic fluid from the pump directly back to the tank during the up mode operation, thereby controlling the up speed of the elevator;...     

The disclosure is directed to a closed center, pressure compensated hydraulic system which uses a multiple section hydraulic control valve in conjunction with a variable output hydraulic pump. The hydraulic control valve has a plurality of independently operable power spools each of which is used to...     

A fluid power device such, for example, as one for opening and closing clam shell gates is operated by a ram under fluid pressure. A tank is provided for storing fluid under pressure and by a system of valving extension of the ram, as for a gate opening operation, is inhibited until enough fluid under...     

A load responsive direction and flow control valve for use in fluid power load responsive system. The system is powered by a single fixed or variable displacement pump. The valve maintains a selected constant flow level during control of positive loads and automatically blocks pump flow to the actuator...     

A fluid controller is disclosed of the type including a primary valve member, and a follow-up valve member. The controller includes a load signal port and a load signal chamber. Fluid is communicated from the inlet port to the load signal chamber, and the valve members define a neutral orifice communicating...     

A load responsive fluid power multiple load control system using load responsive direction and flow control valves in combination with pump flow control responding to highest system load. Each direction flow control valve is equipped with a load responsive negative load control to control a constant...     

A direction flow control valve for control of positive and negative loads equipped with a load responsive positive and negative load control which automatically regulates valve inlet pressure to maintain a relatively constant pressure differential between inlet pressure and load pressure and throttles...     

A compensated work port fluid valve is provided wherein a directional control valve having an inlet chamber, an outlet chamber and a work chamber is provided with a compensator valve connected to the work chamber and having a pressure sensing compensator valve controlling the flow of fluid from the work...     

A device for cushioning hydraulic actuators at the end of travel including a unique valve responsive to hydraulic pressure which, one when under system return pressure ports fluid to a chamber of less volume than the actuator cylinder and then through a line restriction for reduced fluid flow and the...     

A flow control valve in fluid communication with a variable orifice which is utilized to control speed of a fluid motor, the valve providing a constant pressure drop across the variable orifice whereby consistent control of speed of the motor may be maintained.

A direction flow control valve for control of positive and negative loads equipped with a load responsive positive load control which automatically regulates valve inlet pressure to maintain a relatively constant pressure differential between inlet pressure and load pressure. The load responsive control...     

A load responsive direction and flow control valve for use in fluid power load responsive system. The system is powered by a single fixed or variable displacement pump. The valve maintains a selected constant flow level during control of positive loads and automatically blocks pump flow to the actuator...     

A power steering device includes a housing which journals coaxial input and output shafts. Drivingly connected to the input shaft is an eccentric which rotatably carries a gear wheel. The gear wheel is prevented from rotating in the housing so that it gyrates when the input shaft rotates. An internally...     

In a fluid throttling pressure compensated valve remote control of position of valve spool in which the total force acting on the spool is directly proportional to displacement of the spool from its neutral position, irrespective of the pressure differential between the pump pressure and the load pressure...     

A direction flow control valve in a load responsive system equipped with a positive load compensator, which in the presence of negative load either blocks the pump flow to the motor above a certain predetermined level of the exhaust manifold pressure, or below that predetermined pressure level acts as...     

A high pressure hydraulic system, including a bidirectional fluid motor having two ports, a pair of normally closed, pilot operated poppet valves, each connected to an associated port, a fluid reservoir, a flow sensor having a flow path interconnecting each of the poppet valves and the reservoir and...     

This invention relates to a pneumatic cylinder and valve control system in which a block and two plates bolted to the block form one end of the cylinder. This block and plate combination, moreover, provides the housing for the valves and conduits that comprise the pneumatic control system for the operation...     

A control valve for actuating a double acting hydraulic jack or lift cylinder features a pressure compensator assembly for limiting the rate of retraction of the cylinder and piston relative to each other under heavy loading conditions to prevent dropping a load or letting the load get out of control....     

A load responsive fluid power multiple load control system using load responsive direction and flow control valves in combination with pump control responding to highest system load. Each direction flow control valve is equipped with a load responsive pressure control which automatically regulates valve...     

A control system for operating a double-acting hydraulic ram or motor, including a proportional meter-out type directional-control valve which meters the flow of fluid out of the load and, in association therewith, a combined flow and pressure-control valve in the return line from the load. The flow...     

A load responsive fluid control system in which system pump controls permit variation in the level of pressure differential in response to an external control signal and which uses direction control valves equipped with load responsive variable pressure differential positive load controls.

A pressure operated valve restricts outflow of fluid from a servomotor to which inflow of fluid is controlled by valve elements torsionally interconnected by a torsion bar for limited relative rotation. The pressure operated valve, mounted within one of the valve elements, is displaced by operating pressure...     

A direction flow control valve for control of positive and negative loads equipped with a load responsive positive load control which automatically regulates valve inlet pressure to maintain a relatively constant pressure differential between inlet pressure and load pressure. The load responsive control...     

A direction flow control valve for control of positive and negative loads equipped with a load responsive positive load control which automatically regulates valve inlet pressure to maintain a relatively constant pressure differential between inlet pressure and load pressure. The load responsive control...     

In a hydraulic apparatus, operating oil delivered from a fixed delivery hydraulic pump is divided into two parts, one end of which is discharged into an oil tank by passing through a serial circuit of a normally open valve and an orifice and the other end of which is supplied to a piston-cylinder mechanism...     

A direction flow control valve for control of negative load equipped with a load responsive negative load control, which automatically regulates valve outlet pressure to maintain a relatively constant pressure differential between negative load pressure and valve outlet pressure and which permits variation...     

A direction flow control valve for control of positive loads equipped with a pilot operated load responsive positive load control, which automatically regulates valve inlet pressure to maintain a relatively constant pressure differential between inlet pressure and load pressure and which permits variation...     

A pressure reducing valve between a high pressure source and a steering control valve lowers the operating pressure of fluid conducted to a piston servomotor from the source by the steering control valve. A constant pressure differential across the steering control valve is maintained by the pressure...     

A direction flow control valve for control of negative load equipped with a pilot operated load responsive negative load control, which automatically regulates valve outlet pressure to maintain a relatively constant pressure differential between negative load pressure and valve outlet pressure and which...     

Fluid control circuits employed on construction vehicles to control the actuation of various work cylinders oftentimes include a system for sensing the fluid pressure in the cylinder and communicating such fluid pressure to a control device in signal form to closely control the displacement of a pump,...     

A direction flow control valve for control of positive and negative loads equipped with a positive and negative load compensator controlled by a single pilot valve stage responsive to positive and negative load pressure signals.

A direction flow control valve for control of positive loads equipped with a load responsive positive load control, which automatically regulates valve inlet pressure to maintain a relatively constant pressure differential between inlet pressure and load pressure and which permits variation in the level...     

A valve is provided, particularly as a part of a block control device, made up of an elongate housing having a longitudinal bore with spaced work chambers, inlet chambers and exhaust chambers intersecting the bore and an elongate cylindrical spool slidable in said bore, having a second bore in each end...     

A progressive pneumatic starter device delivers at its outlet an increasing pressure of low flow rate, then a working pressure at a high flow rate. The starter device is provided with a distributor member adapted to connect, in parallel with a calibrated bore, a channel of large section, when a pressure...     

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 consisting of a normally open valve and an orifice and the other of which is supplied to a piston-cylinder...     

A direction flow control valve for control of positive and negative loads equipped with a positive and negative load compensator controlled by a single pilot valve stage responsive to positive and negative load pressure signals. The positive and negative load compensator is provided with two sets of...     

A direction flow control valve for control of positive and negative loads equipped with a positive and negative load compensator controlled by a single pilot valve stage responsive to positive and negative load pressure signals.

An hydraulic system: a power assisted vehicle steering system which includes such an hydraulic system and a method of alleviating noise in an hydraulic system. The hydraulic system as applied to a vehicle steering gear (1) has an open center valve (3) which directs hydraulic fluid under pressure derived...     

An electro-hydraulic proportional control valve includes an electro-hydraulic pilot valve, an inlet pressure reducing valve, and a directional control valve. The electro-hydraulic pilot valve receives an electrical input signal and provides a hydraulic signal to the directional control valve in response...     

A direction flow control valve for control of positive and negative loads operated by a single pilot valve stage, which automatically maintains a relatively constant pressure differential across valve spool, while controlling positive and negative loads and which permits variation in the level of pressure...     

A hydraulic valve mechanism has a housing with first and second bores, a control valve element in the first bore, a pressure compensation valve in the second bore, and a non-return valve cooperating with motor parts, wherein control edges for direction control are arranged on the control valve element...     

A priority flow control system in which the priority feature is obtained by progressively lowering the pressure differential of nonpriority valves, once the maximum pump output is reached, so that all of the system valves always retain their compensated proportional flow feature.

An electro-hydraulic proportional actuator in which the actuator piston position is hydraulically controlled by fluid flow through solenoid valves operable by an electronic control system. An operator control provides an input voltage representing a desired piston position and a transducer generates...     

A hydraulic valve system particularly adapted for controlling a hydraulically powered elevator. The system involves essentially a bypass valve which selectively bypasses hydraulic fluid from the pump directly back to the tank during the up mode operation, thereby controlling the up speed of the elevator;...     

A 4-way, 3-position, on-off type electrohydraulic valve includes a pair of solenoid-operated inlet valves for controlling communication between a pump and a valve bore. A pair of adjustable check valves are positioned in opposite ends of the valve bore. A double-acting pilot return valve assembly is...     

In a pressure compensated flow control system a flow control valve has a valve element which is subjected to pulsating fluid pressure by which it is maintained in a state of dither about a mean position corresponding to the selected flow rate through the valve. The valve element is spring-biased towards...     

For supplying a compressible driving fluid, preferably air, under pressure from a source to a motor of the kind comprising a housing, in which a body is reciprocable between predetermined end positions while dividing the interior of the housing into two chambers alternatingly serving as fluid receiving...     

A hydraulic system includes a pump, a reservoir, and an actuator system. A hydraulic circuit breaker is arranged to compare fluid flow to and from the actuator system and to shut off this flow in the event the flow to the actuator system is greater than the flow returning from the actuator system by...     

A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a pump for supplying fluid to said actuator, a pilot operated meter-in valve to which the fluid from...     

A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions and a variable displacement pump with loading sensing control for supplying fluid to said actuator. A...     

A direction flow control valve for control of positive and negative loads equipped with positive and negative load compensators, a single pilot valve stage responsive to positive and negative load pressure signals and control signal diverting valve operable to connect the pilot valve stage either to...     

An electropneumatic door valve for use with pneumatic door operations as are used on mass transit vehicles. The single valve housing arrangement provides either a through passageway or a throttled passageway for pressurizing the opening or closing chamber of a pneumatic door drive unit. Provisions are...     

A fail-safe actuator mechanism has an actuator housing encapsulated within a tank which stores a pressurized fluid media. Ports of the actuator housing are put into selective fluid communication with both the interior and exterior of the encapsulating tank by a valve at selective pressures.

A valve combining in a single unit a multiplicity of functions including isolation, thermal and pressure relief, return check and bypass. The valve includes a pair of spool valves, one slidably positioned within the other, disposed with a bore in a housing and interconnected with system pressure and...     

A hydraulic valve is provided which can be modified to provide priority compensation, parallel pressure compensation, inlet check functions and a float function by changing a flow through inlet valve portion in the inlet chamber of the valve.

A hydraulic valve is provided which can be modified to provide priority compensation, parallel pressure compensation, inlet check functions and a float function by changing a flow through inlet valve portion in the inlet chamber of the valve.

A pneumatic door control equipped with a door control valve for operating a door drive to an open or a closed position. The door control valve has an opening and a closing solenoid-operated pilot valve and an opening and closing spool valve, each operable to a passage or a vent position. A shuttle valve...     

The invention relates to a hydraulic control valve assembly for controlling a consumer unit such as a servomotor of a vehicle steering system. The valve assembly has a conventional port arrangement which includes two selectively pressurizeable and drainable motor ports connectable to a servomotor and...     

In a pneumatic nailer using compressed air for driving nails, a work chamber contains a drive piston and is in communication with a storage chamber for effecting the return of the drive piston after it has driven a nail. A valve unit controls the supply of additional compressed air into the storage chamber....     

An electrohydraulic servovalve which includes as an integral part thereof a monitor valve which senses the absence or lack of system pressure in the first or second stages of the valve and translates in the absence thereof to deactivate load control. The torque motor of the electrohydraulic servovalve...     

A power steering system which includes an engine-driven pump, a fluid motor for supplementing manual steering torque, a fluid control valve for distributing fluid to the fluid motor, and a reaction device for applying hydraulic reaction or feeling to a steering wheel. A first flow control valve is utilized...     

An arrangement for supplying pilot oil to a servo-valve arranged to activate a main valve of a hydraulic system. The hydraulic system also includes a hydraulic oil pump, a valve located between the pump and the main valve, a pressure reducing valve located between the pump and the servo-valve, and at...     

A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions and a variable displacement pump with loading sensing control for supplying fluid to said actuator. A...     

A hydraulic circuit breaker for use with a hydraulic device comprising a body having a supply conduit for supplying hydraulic fluid under pressure to the hydraulic device and a return conduit for carrying hydraulic fluid away from the hydraulic device. A slide valve is mounted for movement in a first...     

A hydrostatic drive is provided having an adjustable pump connected with a pump servo positioned by a control pressure from a line connected between the consumer and an adjustable measuring restrictor which in turn is connected to a switching means which includes a plurality of hollow ended main spools...     

A hydraulic control apparatus has at least two meter-in and two meter-out poppet valves. In order to be compact and deal with a great flow rate, the apparatus is arranged such that a pair of meter-in poppet valves and load check valves are located in an upper horizontal plane, a pair of meter-out poppet...     

A compensated direction flow control valve arrangement provided with a direction control spool for control of fluid flow to and from a fluid motor, which may be of a cylinder type and is subjected to positive and negative loads. During control of negative load the upstream of the outflow metering orifice,...     

The point at which pump out pressure exceeds load is sensed to provide a point for scheduling flow to an actuator in a hydraulic system. Flow is controlled by a stepper motor (28) that moves a flow control valve (27). The steps needed to achieve fixed flow changes are greater for high flow positions....     

A compensated direction flow control valve assembly for control of fluid flow to and from a fluid motor, which may be of a cylinder type and is subjected to positive and negative loads. During control of negative load, the negative load compensating control varies the level of the pressure differential...     

A compensated control valve assembly for control of fluid flow to and from a fluid motor, which may be of a cylinder type and is subjected to positive and negative loads. During control of negative load the controlled pressure level of a pressure reducing valve mechanism handling the fluid flow at negative...