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US 5,332,002 AGranted
Gate valve
AssigneeDril-Quip, Inc.
InventorLarry E. Reimert
Life of this patent
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Abstract
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.
Claims10
A gate valve, comprising
- a body having a flowway therethrough, and a cavity therein intersecting the flowway intermediate its ends,
- means forming annular seating surfaces in the body cavity at its intersection with the inner ends of the flowway,
- means for opening and closing the flowway including
- a pair of gates each having parallel sides and guidably slidable within the cavity between the seating surfaces between positions opening and closing the flowway,
- means for moving a first gate from its closed toward its open position prior to moving the second gate from its closed toward open position and then moving the gates together to their open position, and
- means for venting the cavity to the flowway on the outer side of one of the gates prior to movement of the second gate from its closed toward its open position.
3 more elements
Dependencies are inferred from the claim text.