... muzzle door control valve operating handle 前盖传动控制手柄 water valve handle 水阀手轮 ; 水阀手轮[把手] quick coupler valve handle 快速联接器阀门手柄 ...
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手轮、手柄和扳手传动以及安全阀、减压阀、疏水阀省略本代号。
The engineer opened the safety valve to allow the steam to escape and so reduce the pressure.
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