Forklift Hydraulic Control Valve
Forklift Hydraulic Control Valve - The control valve is actually a device that routes the fluid to the actuator. This device will consist of cast iron or steel spool that is located inside of housing. The spool slides to various positions within the housing. Intersecting grooves and channels route the fluid based on the spool's position.
The spool is centrally situated, help in place with springs. In this particular position, the supply fluid can be blocked and returned to the tank. If the spool is slid to a direction, the hydraulic fluid is routed to an actuator and provides a return path from the actuator to tank. When the spool is transferred to the other direction, the supply and return paths are switched. Once the spool is allowed to return to the center or neutral place, the actuator fluid paths become blocked, locking it into place.
The directional control is normally designed to be stackable. They normally have one valve per hydraulic cylinder and a fluid input that supplies all the valves within the stack.
Tolerances are maintained extremely tightly, in order to handle the higher pressures and to prevent leaking. The spools will normally have a clearance within the housing no less than 25 Âµm or a thousandth of an inch. In order to avoid distorting the valve block and jamming the valve's extremely sensitive components, the valve block would be mounted to the machine' frame by a 3-point pattern.
A hydraulic pilot pressure, mechanical levers, or solenoids may actuate or push the spool right or left. 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 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 amongst the most expensive and sensitive parts of a hydraulic circuit.
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