Hydraulic control valve is a main valve and the exterior of the needle valve and a combination of the pilot valve.

水力控制阀是由一只主阀及其外装之针形阀和先导阀等组合而成。

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Hydraulic control valve is a main valve and the exterior of the needle valve and a combination of the pilot valve.

水力控制阀是由一只主阀及其外装之针形阀和先导阀等组合而成。

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