Hydraulic Control Valves for Forklift

Hydraulic Control Valve for Forklift - The function of directional control valves is to route the fluid to the desired actuator. Generally, these control valves comprise a spool positioned inside of a housing made either from cast iron or steel. The spool slides to different places inside the housing. Intersecting grooves and channels route the fluid based on the spool's location.

The spool is centrally located, help in place by springs. In this particular position, the supply fluid can be blocked and returned to the tank. When the spool is slid to one side, the hydraulic fluid is directed to an actuator and provides a return path from the actuator to tank. If the spool is moved to the other side, the return and supply paths are switched. When the spool is enabled to return to the neutral or center place, the actuator fluid paths become blocked, locking it into position.

Normally, directional control valves are built so as to be stackable. They normally have one valve per hydraulic cylinder and a fluid input that supplies all the valves inside the stack.

Tolerances are maintained extremely tightly, to be able to deal with the higher pressures and to be able to avoid leaking. The spools would often have a clearance in the housing no less than 25 Ã?â??Ã?µm or a thousandth of an inch. In order to prevent distorting the valve block and jamming the valve's extremely sensitive components, the valve block will be mounted to the machine' frame with a 3-point pattern.

The location of the spool can be actuated by mechanical levers, hydraulic pilot pressure, or solenoids which push the spool left or right. A seal allows a part of the spool to protrude outside the housing where it is accessible to the actuator.

The main valve block controls the stack of directional control valves by flow performance and capacity. Several of these valves are designed to be proportional, like a valve position to the proportional flow rate, while some valves are designed to be on-off. The control valve is one of the most sensitive and pricey parts of a hydraulic circuit.

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