用一个O形环密封安全阀阀体与主外壳。

An O-ring seals the relief valve body to the main housing.

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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。

The check valves shall be modular and shall seal to the main valve body by the use of an O-ring.

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从阀杆上的阀杆O形环密封开始，然后在手柄安装在阀杆上后，将其压进手柄的位置上。

Start stem O-ring seal over stem, then press into position as handle is pressed down over stem.

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