automatic valve ; self-acting valve
... selector valve body 分配阀壳体 self-acting valve 自动阀; 自动活门 self-closing valve 自闭阀 ...
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如果由于活门垫、活门损坏或由于其它原因，导致出口压力自行上升并超过一定许可值时，安全阀会自动打开排气。
If, as a living doormat, valve damage, or due to other reasons, led to pressure to increase exports and to permit more than a certain value, the safety valve will automatically open the exhaust.
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