Hitachi Excavator Spare Parts Main Relief Valve 4372038 4654858 4651860 YA00011313

Original Main Relief Valve For Excavator ZAX Series 4372038 4654858 4651860 YA00011313

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We have other various types of relief valves that you can contact us to know more.

Performance requirements of the hydraulic system on the relief valve:
(1) High accuracy of constant pressure.
(2) The sensitivity should be high.
(3) Work should be stable and free from vibration and noise.

(4) When the valve is closed, the seal should be good and the leakage should be small.

When the hydraulic cylinder suddenly stops moving. Open the relief valve quickly, otherwise. The oil output by the quantitative pump will not be discharged in time, which will cause the system pressure to rise suddenly and exceed the set pressure of the relief valve. It is called dynamic pressure overshoot, which increases the pressure of each component and pipeline in the system and affects its life. The more sensitive the relief valve is. The smaller the dynamic pressure overshoot.