... manual shutoff valve 手控断油开关 main valve ring 主阀环 oil pressure relief valve spring 油压安全阀簧 ...
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An O-ring seals the relief valve body to the main housing.
用一个O形环密封安全阀阀体与主外壳。
The check valves shall be modular and shall seal to the main valve body by the use of an O-ring.
这种止回阀应该是模块化的，并且应该采用一个O形环密封在主阀体上。
Note: The main spare parts and sealing-ring materials of ball valve series can be designed for Options as per real working conditions and users special reauirements.
主要零部件及密封圈的材质亦可根据实际工况条件或用户特殊要求设计选用。
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