单向阀（check valve）：止回阀、检查阀。 断油阀（oil stop valve）：喷油阀、止油阀。 最小压力阀（minimum pressure）：逆止阀。
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If the 450-ton valve at the wellhead can be turned on, the oil flow should stop, and the spill could be ended quickly.
如果井口450吨重的阀门可以可以关上，油流就可以停止，那么溢油很快就可以停下来。
The reversing valve and the hydraulic oil source, the reversing valve and the rotating valve, the rotating valve and the stop valve are all connected.
换向阀与液压油源间、换向阀与转阀间和转阀与截止阀间均相连接。
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