Embodiments of the present invention disclose a valve. The valve includes: a valve casing, a main valve spool and a counterbalance valve spool. The counterbalance valve spool is disposed in a main valve spool internal cavity of the main valve spool and is slidable between a first counterbalance valve spool position and a second counterbalance valve spool position. The counterbalance valve spool includes: a counterbalance valve spool body; and a first counterbalance valve spool recess formed on an outer periphery of the counterbalance valve spool body. In a state where the counterbalance valve spool is in the first counterbalance valve spool position, an inlet of an outlet passage of the main valve spool is closed by the counterbalance valve spool; and in a state where the counterbalance valve spool is in the second counterbalance valve spool position, the inlet of the outlet passage of the main valve spool is opened by the counterbalance valve spool through the first counterbalance valve spool recess of the counterbalance valve spool, so that a second working port is in communication with a return port through an inlet passage configured for the second working port, the first counterbalance valve spool recess and the outlet passage.

A mode valve includes a spool axially moveable within a sleeve in response to a control (e.g. hydraulic or electro-mechanical) command. The spool includes channels and lands, and the sleeve comprising ports in fluid communication with a hydraulic fluid supply and ports in connection with control chambers of an actuator responsive to the valve. The valve also includes first drive means for moving the spool, relative to the sleeve, between a first position, and a second position in which fluid flow from the fluid supply to the actuator chambers through the valve is blocked and wherein a fluid path with a first pressure drop is defined in the mode valve for fluid flow between actuator chambers; the mode valve comprising second drive means for moving the spool relative to the sleeve to a third position in which fluid flow from the fluid supply to the actuator chambers is blocked.

A poppet valve includes an inlet port, a first outlet port, a second outlet port, a first exhaust port, a second exhaust port, and a spindle. A first poppet element and a second poppet element each float relative to the spindle. A first piston and a second piston are fixed relative to the spindle. The spindle moves from an initial centered closed position to a first actuated position or a second actuated position to direct air flowing from the inlet port to the first outlet port or the second outlet port, respectively. The initial centered closed position is located between the first actuated position and the second actuated position. A housing contains the spindle, the first poppet element, the second poppet element, the first piston and the second piston.

A spool is slidably located in a slide hole of a first housing. A second housing forms a servo chamber that is coaxial with the slide hole. A sleeve is slidably located in the servo chamber. A nut is fixed to a piston that is slidably fitted in the sleeve. An electric motor rotates a screw shaft screwed with the nut. The second housing includes an input port and a drain port. A first pressure chamber communicates with the input port. In a balanced state where forces applied to the sleeve from both sides are balanced, a second pressure chamber is blocked from the input port and the drain port by the piston. From the balanced state, when the piston shifts, the second pressure chamber comes into communication with the input port or the drain port.

A hydraulic driving device of an industrial vehicle includes: a tank which stores hydraulic oil; a hydraulic pump which includes a suction port sucking the hydraulic oil and a discharge port discharging the hydraulic oil; a hydraulic cylinder which is driven by the hydraulic oil discharged from the discharge port of the hydraulic pump; a direction switching valve which is disposed among the hydraulic pump, the tank, and the hydraulic cylinder and switches a hydraulic oil flow direction in response to an operation state of operation means for driving the hydraulic cylinder; in which the direction switching valve includes a main spool which moves in response to the operation state of the operation means and a flow regulator which is disposed inside the main spool to control a flow rate of the hydraulic oil flowing from the hydraulic cylinder to the tank.

A valve member having a supply pressure and a method of controlling the supply pressure in the valve member includes a valve body having a fluid inlet, a fluid outlet, and a controlled port. The valve member includes a spool moveable within the valve body to fluidly connect at least one of the fluid inlet and the fluid outlet with the controlled port. The spool includes an end in fluid communication with a control pressure port and a pin received within the end of the spool that is moveable relative to the spool. Fluid flow through the control pressure port acts against a cross-sectional area of the pin and an annular area of the spool to modulate the supply pressure through the valve member.

A hydraulic axial-piston machine achieves a control cut-off by an additional control edge of a control valve of an actuating mechanism for swiveling a swash plate.

A spool valve device includes a valve body, an actuator port, a spool, a supply passage, and a regeneration flow passage formed in the spool. An inflow port of the regeneration flow passage always communicates with the actuator port, when the spool is placed at a regeneration switching position where a predetermined moving amount from a neutral position is ensured, the outflow port of the regeneration flow passage communicates with the actuator port through the supply passage, and when the spool is placed at a position other than the regeneration switching position, the communication between the outflow port and the actuator port is blocked.

Systems and methods use selective regeneration to aid in controllability and efficiency of a hydraulic circuit. A regeneration deactivation valve can react to a differential pressure when the function is in free air and at risk of cavitating or when then function is doing positive work and needs to be efficient. When the function is at risk of cavitating, the regeneration deactivation valve can react to the potential for cavitation and the regeneration deactivation valve closes so the function regenerates. The regeneration deactivation valve can also react when the function is not at a risk of cavitating and can open up allowing the function to move with more power and efficiency.

Disclosed is a flow control valve for a construction equipment for controlling the amount of oil supplied to a hydraulic actuator from a hydraulic pump. The flow control valve for the construction equipment, according to the present invention comprises: a valve body installed on the path between a hydraulic pump and a hydraulic actuator and configured with a supply path communicating with a pump path supplying the hydraulic oil from the hydraulic pump and the actuator ports connected to the hydraulic actuator; a switchable spool provided within the valve body; a pressure chamber provided within the spool, which communicates with the supply path and the actuator port on one side; a signal pressure path provided within the spool, which communicates with the actuator port on the other side and the pressure chamber; and a flow control valve provided within the pressure chamber, wherein when the pressure of the hydraulic oil returning to the hydraulic oil tank from the hydraulic actuator exceeds the predetermined pressure, the flow control valve is switched by the returning oil supplied through the signal pressure path and blocks the opening part.