Excavator Komatsu PC35MR-2 20T-62-71160 Hydraulic Main Control Valve assy

List of spare parts

Construction and Components

An excavator control valve consists of multiple integrated components:

(A) Valve Body

• Made of high-strength cast iron or steel to withstand high pressure (typically 300-400 bar).

• Contains precision-machined oil passages for smooth hydraulic flow.

(B) Spool Valves (Main Control Elements)

• Sliding spools inside the valve body shift to open or block oil flow.

• Spool movement is controlled by pilot pressure (hydraulic) or solenoid valves (electro-hydraulic).

(C) Pilot Valve (for Hydraulic Control)

• Generates low-pressure hydraulic signals to move the main spool.

• Reduces operator effort by using a smaller control pressure to regulate larger flows.

(D) Pressure Compensation Valve

• Ensures consistent flow regardless of load changes.

• Prevents one function from starving another when multiple movements occur simultaneously.

(E) Relief Valve (Safety Feature)

• Limits maximum system pressure to protect hydraulic components.

• Activates when pressure exceeds a set threshold (e.g., 350 bar).

(F) Check Valves (Anti-Cavitation & Load Holding)

• Prevent backflow and maintain cylinder position when the valve is neutral.

• Some models include over-center valves for better load control.

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