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8430016 |
Control valve assembly with a workport pressure regulating device
A hydraulic system has several valve sections, each having a directional valve that controls fluid flow from a pump to a hydraulic actuator. A mechanism senses a greatest pressure among the...
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8413688 |
Device for controlling a pilot pressure signal
A device (100, 200, 200bis, 300, 300bis) for controlling a pilot pressure signal of hydraulic valves (3), for controlling the handling of gravitational loads (M), operating between two pilot lines...
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8375975 |
Load sensing directional control valve with an element having priority under saturation conditions
The invention relates to the field of load sensing, flow sharing directional control valves for controlling an operating machine, such as an excavator. The directional control valve of the present...
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8356546 |
Holding control valve
A holding control valve of the present invention is configured such that: a spool is configured to perform strokes by a piston configured to operate by introduction of pilot pressure and have a...
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8122714 |
Variable hydraulic motor driving device
A hydraulic motor 11 is switched to a high-speed mode when pressure oil is supplied to a pressure chamber 23 of a tilt piston 17 based on the transmission of a speed signal to a high-low speed...
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8109198 |
Hydraulic control apparatus
A hydraulic control apparatus 1 includes a switch valve 11, a valve support chamber 35, a flow control valve 12 movable within the valve support chamber 35, an on-off valve 13 movable within the...
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8091355 |
Flow compensated restrictive orifice for overrunning load protection
A hydraulic circuit for an actuator that has a piston and piston rod that will move a load in a first direction, and which can be externally loaded in an opposite direction, includes a flow...
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8056465 |
Active implement down force system providing reduced heat generation
A line connects the tractor hydraulic power beyond supply to the pressure reduction valve that is connected to the implement cylinder ends and automatically controls implement down pressure. Fluid...
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8042451 |
Hydraulic control apparatus
A hydraulic control apparatus 1 includes a switch valve 11, an adjustment valve 12, and a valve control device 13. The adjustment valve 12 has a fluid chamber 15, a valve body 14, and a back...
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8001882 |
Double check valve having floating function
A double check valve having a floating function is disclosed, which can prevent construction equipment from overturning through intercepting of a floating function even if a signal pressure is fed...
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7975598 |
Hydraulic valve arrangement
The invention concerns a hydraulic valve arrangement (1) with a supply connection arrangement comprising a high-pressure connection (P) and a low-pressure connection (T), a working connection...
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7913612 |
Actuator control device
In an actuator control device that controls an expansion/contraction operation of a hydraulic cylinder, when a main spool 52 is switched to a discharge position for discharging working fluid in the...
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7617760 |
Valve device
A control valve device (1) for the control of a consumer (2), in particular of a dual-action consumer, includes a control valve (3) that controls the connection of an admission side of the consumer...
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7574860 |
Damper valve and hydraulic power steering apparatus
A damper valve includes first and second chambers separated by a partition wall, hydraulic oil flowing from the first chamber to the second chamber via a supply path, and returning to the first...
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7415989 |
Spool activated lock-out valve for a hydraulic actuator load check valve
A check valve system controls the flow of fluid between a spool valve and a hydraulic actuator and includes a pilot operated check valve that is controlled by a lock-out valve. The check valve has...
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7395662 |
Hydraulic control arrangement
A hydraulic control arrangement is disclosed for the control of a consumer, comprising at least one mechanically operated continuously adjustable distribution valve with a subsequent LUDV pressure...
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7328646 |
Hydraulic valve arrangement
The invention concerns a hydraulic valve arrangement (1) with a control valve module (2) comprising a supply connection arrangement with a high-pressure connection (P) and a low-pressure connection...
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7305821 |
Hydraulic control apparatus
A hydraulic control apparatus is provided to prevent failure that can occur due to hunting, to elevate performance of a hydraulic control valve, and to improve operation efficiency by effectively...
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7302797 |
Hydraulic system having a post-pressure compensator
A hydraulic system for a work machine is disclosed. The hydraulic system has a reservoir configured to hold a supply of fluid and a source configured to pressurize the fluid. The hydraulic system...
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7263924 |
Hydraulic circuit and its valve gear
To simplify a circuit structure and a path structure in a hydraulic circuit having a pilot check valve and an overload relief valve and to reduce the size of a gear. The hydraulic circuit includes...
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7162946 |
Hydraulic control valve having holding valve with improved response characteristics
Disclosed is a hydraulic control valve having a holding valve with improved response characteristics. The hydraulic control valve includes a valve housing including a pump path communicating with a...
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7003949 |
Integrated three function valve
An integrated three function valve (ITFV) that combines the functions of a bypass valve (e.g. 183a, 185a, 161a) into a single assembly is disclosed. The ITFV allows continued operation after any...
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6948524 |
Pressure holding apparatus for a torque-transmitting mechanism
A pressure holding apparatus incorporates a hydraulic pressure system having an engine-driven pressure source, a pressure holding valve, and a torque-transmitting mechanism. The torque-transmitting...
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6922923 |
Change-over valve for boom cylinder of excavating/slewing work truck
In an excavating/slewing work truck, the boom falls freely at the time of lowering operation without requiring any power but the flow rate of a pump increases excessively when the speed is balanced...
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6865886 |
Hydraulic control system
A hydraulic control system (1) has a hydraulic motor (10), which is connected with a control valve (2) via two working lines (8, 9), the control valve (2) being connected with a low-pressure...
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6848473 |
Low leak boom control check valve including an insert
An insert or cartridge that fits into a cavity in a valve body provides a check valve function and an anti-cavitation function and a pressure relief function. This insert is substantially circular...
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6761027 |
Pressure-compensated hydraulic circuit with regeneration
A fluid system includes first and second control valves that control fluid communication with first and second actuators. The first control valve may combine fluid flow from a second end port of...
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6746326 |
Hydraulic clutch
A fluid operated actuator includes a shaft and a housing. The shaft is at least partially mounted in the housing for relative rotation between the shaft and the housing. The shaft includes a...
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6742438 |
Hydraulic valve control device for heavy construction equipment
An actuator is prevented from an abrupt descent by supplying a high-pressure hydraulic fluid drained upon the descent of the actuator to a path on a supply side of the actuator, provided is a main...
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6679162 |
Working cylinder, switch valve and pressure-actuated working unit
A working cylinder (A) having at least one working chamber (6, 7) defined by the cylinder barrel (1), at least one of the end sections (2, 3) and a piston (4), at least one supply port (9a, 9b) and...
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6536328 |
Damper valve for hydraulic power-assisted steering system
A damper valve (70) located between a control valve (18) and a power steering motor (22) in a hydraulic power-assisted steering system (10). The damper valve (70) comprises a housing (72) having...
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6523453 |
Hydraulic control valve for agricultural implements
A hydraulic valve having a main body in which is formed a pressurized-fluid inlet opening; a first conduit communicating hydraulically with a user device; a second conduit communicating...
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6499505 |
Hydraulic valve arrangement
A hydraulic valve arrangement includes a control valve (3), which, in a first operating position (5), connects a motor connection (21) with a pump connection, in a second operating position (6),...
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6467392 |
Steering damper for a hydraulic power-assisted steering system
The invention concerns a hydraulic power-assisted steering system for motor vehicles, with a valve and two hydraulic lines leading from the valve to cylinders of a servo drive mechanism and with at...
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6457487 |
Hydraulic system with three electrohydraulic valves for controlling fluid flow to a load
An assembly of a pair of electrically operated bidirectional proportional control valves and a four-way direction control valve governs the flow of fluid to and from a hydraulic cylinder. The...
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6439102 |
Tilt control device for fork lift truck
A tilt control device for a fork lift truck comprises a tilt spool for operating the tilt cylinder, a pilot operation type flow rate control valve connected to the hydraulic pump via the tilt spool...
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6438952 |
Hydraulic circuit device
A hydraulic circuit system having a load sensing system including a hydraulic pump, a plurality of hydraulic actuators driven by a hydraulic fluid delivered from the hydraulic pump, a plurality of...
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6427721 |
Hydraulic valve arrangement with locking function
The invention concerns a hydraulic valve arrangement with locking function. It has a control valve (9), which in two operating positions (11, 12) connects one motor connection (A) with a pump...
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6422126 |
Power steering apparatus
In a power steering apparatus provided with a damper valve, a second valve apparatus of the damper valve is provided with a valve plate in contact with and apart from a partition member so as to...
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6397726 |
Device for path-dependent control of force generated by a piston
The invention provides a method and apparatus for controlling in a path-dependent manner the force generated by a piston. A first piston travels in a first cylinder—divided into a first and s...
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6371006 |
Cylinder control device
A main passage communicated to a pump passage or a tank passage by switching operation of a spool valve is provided with an operation check valve permitting communication only to a cylinder. A...
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6318079 |
Hydraulic control valve system with pressure compensated flow control
An assembly of valves controls hydraulic fluid flowing to several hydraulic actuators from a variable displacement pump that produces an output pressure equal to a control input pressure plus a...
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6305264 |
Actuator control circuit
Disclosed is an actuator control circuit which adopts a meter-in control system to control the displacement speed of a piston of a pneumatic cylinder and which is provided with a first pressure...
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6260357 |
Quick coupler control system
A quick coupler for coupling an implement to a work machine is provided with a control system that substantially prevents inadvertent and unintended release of the implement from the machine....
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6253658 |
Hydraulic control system
The invention provides a hydraulic control system capable of preventing an objective from crashing even if a load supporting passage is fractured or the like during a crane operation for moving...
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6244158 |
Open center hydraulic system with reduced interaction between branches
Directional control valves are arranged with restrictable center passageways connected in series to a fixed displacement pump and with restrictable power and exhaust passageways straddling loads...
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6244410 |
Starting control to control a hydraulic piston /cylinder unit
The present invention relates to control of a hydraulic piston/cylinder unit, in particular a multi-disc clutch having a control valve which can be moved into an open and a closed position, a first...
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6223773 |
Check valve assembly
In a check valve assembly and a valve assembly employing such a check valve assembly, a topping piston may be taken into contact with a main poppet to raise the main poppet from its seat. The main...
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6220289 |
Hydraulic valve arrangement with locking and floating function
A hydraulic valve arrangement with locking and floating function, with a control valve (9), which, for two operating positions (11, 12) connects one motor connection (A) with a pump connection and...
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6202685 |
Electrohydraulic clamping module
In an electrohydraulic clamping module for a clamping element of a tooling machine comprising a pressure regulating valve in a flow line towards said clamping element is provided for regulating the...
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