Hydraulic system and the valve main body may be the integral-type installment, also may separate the installment.
液压系统与阀门本体可以是整体式安装，也可分开装。
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。
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