Product Type: Hydraulic Directional Control Valve (Lever Operated)
Primary Function:
This valve is the main control unit for the hydraulic functions of a forklift. It directs the flow of pressurized hydraulic oil from the pump to various hydraulic cylinders to perform specific actions.
Typical Functions Controlled:
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Lift / Lower: Controls the main lift cylinder that raises and lowers the forks.
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Tilt Forward / Tilt Backward: Controls the tilt cylinders that angle the mast forward and backward.
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Side Shift / Auxiliary Function (if equipped): Many forklifts have a third or fourth spool for additional attachments like side-shifters, carton clamps, or rotators.
Key Features & Characteristics:
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Monoblock Design: The valve body is typically a single, solid block of cast iron or aluminum, making it robust and leak-resistant.
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Lever Operated: The operator uses mechanical levers linked to the valve spools to control its functions.
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Open Center System: Most common in forklifts. When no functions are activated, hydraulic oil flows freely through the valve back to the reservoir, minimizing heat build-up and energy consumption.
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Parallel Circuit: All valve sections (spools) receive pump flow simultaneously, allowing for combined functions (e.g., lifting and tilting at the same time), though the function with the least resistance will move first.
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Built-in Relief Valve: Protects the hydraulic system from damage by limiting the maximum system pressure.
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Load Check Valves: Internal valves that prevent a load from dropping unexpectedly if a hose bursts or a connection fails.
Common Applications:
This specific valve is designed for use on Clark brand forklifts. It would be found on various electric and internal combustion (IC) pneumatic tire forklifts within Clark’s product range.
