Hydraulic Control Valves for Forklift

Forklift Hydraulic Control Valve - The control valve is a tool that directs the fluid to the actuator. This device would consist of cast iron or steel spool that is situated in a housing. The spool slides to different locations within the housing. Intersecting grooves and channels route the fluid based on the spool's position.

The spool is centrally located, help in place with springs. In this particular location, the supply fluid could be blocked and returned to the tank. When the spool is slid to a side, the hydraulic fluid is routed to an actuator and provides a return path from the actuator to tank. When the spool is moved to the opposite direction, the supply and return paths are switched. When the spool is enabled to return to the center or neutral position, the actuator fluid paths become blocked, locking it into place.

The directional control is normally designed to be stackable. They normally have one valve for each and every hydraulic cylinder and a fluid input which supplies all the valves within the stack.

So as to avoid leaking and handle the high pressure, tolerances are maintained really tight. Typically, the spools have a clearance with the housing of less than a thousandth of an inch or 25 µm. In order to prevent distorting the valve block and jamming the valve's extremely sensitive parts, the valve block would be mounted to the machine' frame with a 3-point pattern.

The location of the spool could be actuated by mechanical levers, hydraulic pilot pressure, or solenoids which push the spool left or right. A seal enables 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. Some of these valves are designed to be proportional, as a proportional flow rate to the valve position, whereas other valves are designed to be on-off. The control valve is among the most pricey and sensitive parts of a hydraulic circuit.

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