31Q8-17781 31Q8-17783 31N6-17400 Main Relief Valve for R210-7 R210-9 R215-7 R305 Excavators

31Q8-17781 31Q8-17783 31N6-17400 Main Relief Valve for R210-7 R210-9 R215-7 R305 Excavators

 Key attributes

Critical Overload Protection
The core function of these main relief valves is to limit the maximum working pressure of the hydraulic system. When system pressure rises abnormally – such as during heavy digging or breaking operations – the valve opens instantly to release excess oil back to the tank. This effectively prevents costly damage to the main pump, control valves, cylinders, and other core components.

Reliable Performance & System Stability
Featuring pilot-operated or direct-acting designs, these valves respond quickly and precisely to pressure changes. They maintain system pressure accurately at a preset safe level, ensuring stable, controllable power output during heavy-duty operations.

Rugged Construction for Demanding Conditions

Robust Valve Body – Made from high-strength materials with excellent corrosion resistance.

Durable Internals – Key internal components are hardened and precision-ground to withstand extreme pressures and wear.

Reliable Seals – Ensure long-term leak-free performance in hydraulic oil.

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GVO – What Makes Us Different from Other Suppliers

The Difference

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