Forklift Hydraulic Control Valve
Forklift Hydraulic Control Valve - The control valve is a device that routes the fluid to the actuator. This tool will include steel or cast iron spool which is located in a housing. The spool slides to various places within the housing. Intersecting grooves and channels route the fluid based on the spool's position.
The spool has a central or neutral location that is maintained by springs. In this position, the supply fluid is blocked or returned to the tank. If the spool is slid to a 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 supply and return paths are switched. As soon as the spool is enabled to return to the center or neutral position, the actuator fluid paths become blocked, locking it into position.
The directional control is usually designed to be stackable. They normally have a valve per hydraulic cylinder and a fluid input which supplies all the valves within the stack.
Tolerances are maintained extremely tightly, in order to deal with the higher pressures and in order to prevent leaking. The spools will usually have a clearance in the housing no less than 25 Âµm or a thousandth of an inch. In order 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.
The position of the spool can be actuated by hydraulic pilot pressure, mechanical levers, or solenoids which push the spool left or right. A seal allows a portion of the spool to protrude outside the housing where it is easy to get to 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, like a proportional flow rate to the valve position, whereas other valves are designed to be on-off. The control valve is among the most sensitive and expensive parts of a hydraulic circuit.
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