Hydraulic Control Valve for Forklift

Forklift Hydraulic Control Valves - The function of directional control valves is to direct the fluid to the desired actuator. Normally, these control valves include a spool located in a housing made either of cast iron or steel. The spool slides to various locations in the housing. Intersecting grooves and channels route the fluid based on the spool's position.

The spool is centrally positioned, help in place with springs. In this particular position, the supply fluid can 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. If the spool is moved to the other side, the supply and return paths are switched. As soon as the spool is enabled to return to the neutral or center place, the actuator fluid paths become blocked, locking it into position.

The directional control is usually designed to be stackable. They generally have a valve per hydraulic cylinder and a fluid input that supplies all the valves in the stack.

In order to prevent leaking and tackle 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. So as to prevent jamming the valve's extremely sensitive parts and distorting the valve, the valve block will be mounted to the machine' frame with a 3-point pattern.

Mechanical levers, solenoids or a hydraulic pilot pressure might actuate or push the spool left or right. A seal enables a part of the spool to stick out the housing where it is easy to get to to the actuator.

The main valve block controls the stack of directional control valves by capacity and flow performance. Some of these valves are designed to be proportional, like a valve position to the proportional flow rate, whereas other valves are designed to be on-off. The control valve is among the most costly and sensitive components of a hydraulic circuit.

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