摘要 |
There is disclosed two embodiments of a gate valve having a pair of parallel-sided gates for opening and closing a flowway through the valve body upon reciprocation within a gate cavity intersecting the flowway intermediate its ends. The gates are connected to an actuator stem by a lost motion connection which causes one to be moved from closed toward open position prior to the other, and the one gate has a passageway therein for moving into a position to connect the cavity with the flowway prior to movement of the gates together toward open position.
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