发明名称 Gate valve
摘要 Disclosed is an expanding gate valve that expands the gate assembly by engagement of symmetrical opposing inclined cam surfaces with corresponding symmetrical opposing wedges, where at least one of the wedges is driven by the stem that moves the gate assembly, and where the gate assembly is urged back toward the retracted position by at least one lateral-force-inducing member at least when the gate assembly is not in the closed position. Example compact and full body gate valve designs are disclosed. Lateral-force-inducing members may comprise one or more springs, such as a snap-ring, or may comprise cam followers running against surfaces defining the gate members' movement profile. A sealed sleeve is also disclosed that seals the interior of the valve body from pressure in the pipeline when the valve is open, while allowing the gate assembly to expand and retract laterally.
申请公布号 US8777184(B2) 申请公布日期 2014.07.15
申请号 US201213487161 申请日期 2012.06.02
申请人 发明人 Brock Tom J.
分类号 F16K25/00 主分类号 F16K25/00
代理机构 Roberts IP Law 代理人 Roberts IP Law ;Roberts John
主权项 1. An expanding gate valve, comprising: (a) a valve body having a valve chamber and inlet and outlet passages and having spaced interior sealing surfaces; (b) a gate assembly comprising first and second gate members and being movable within the valve chamber to an open position permitting flow of fluid through the inlet and outlet passages and a closed position with the gate assembly located between the sealing surfaces and blocking the flow of fluid through the inlet and outlet passages, the gate members each defining an outer-facing surface facing in the direction of a corresponding interior sealing surface of the valve body, and an inner-facing surface facing the other gate member, the inner-facing surface of each gate member further defining an upper inclined cam surface and a lower inclined cam surface, the upper inclined cam surface symmetrical with the lower inclined cam surface about a latitudinal axis, the upper and lower inclined cam surfaces of the first gate member being symmetrical with the upper and lower inclined cam surfaces of the second gate member about a longitudinal axis, the upper and lower inclined cam surfaces disposed for engagement with opposed upper and lower wedges, respectively, and causing lateral expansion of said gate assembly responsive to engagement of the upper and lower wedges with the upper and lower inclined cam surfaces; (c) a valve stem having driving connection with the upper wedge and the gate assembly for moving the gate assembly linearly to said open and closed positions; and (d) at least one lateral-force-inducing member engaging the gate members and urging them toward each other at least when the gate assembly is not in the closed position; wherein the at least one lateral-force-inducing member further comprises: (e) a first cam follower attached to the first gate member and oriented to travel against a first surface fixed inside the valve chamber, the profile of the first surface causing the first gate member to move toward the second gate member when the gate assembly is moved away from the closed position; and (f) a second cam follower attached to the first gate member and oriented to travel against the first surface fixed inside the valve chamber, the profile of the first surface causing the first gate member to move toward the second gate member when the gate assembly is moved away from the closed position.
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