发明授权
- 专利标题: Pipeline servicing tool
- 专利标题(中): 管道维修工具
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申请号: US256454申请日: 1988-10-12
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公开(公告)号: US4875523A公开(公告)日: 1989-10-24
- 发明人: Edward T. Thornburrow
- 申请人: Edward T. Thornburrow
- 申请人地址: TX Houston
- 专利权人: Cameron Iron Works USA, Inc.
- 当前专利权人: Cameron Iron Works USA, Inc.
- 当前专利权人地址: TX Houston
- 优先权: GBX8730103 19871224
- 主分类号: E21B4/02
- IPC分类号: E21B4/02 ; E21B29/00 ; E21B33/068 ; F16L55/10
摘要:
The invention relates to a compact valve removal tool with a fixed crosshead (18) to be mounted on a pipeline end, such as a wellhead spool outlet (3), and a moving crosshead (19) which is axially slidable, the fixed crosshead accommodating an axially slidable and rotatable rod (16) and gripping means (50) for holding the rod, and the moving crosshead having drive means (23, 24) for advancing and retracting it to enable rod extension pieces (17) to be fitted or removed, the fixed crosshead also having safety stops (58) movable into the line behind the rod or behind a rod extension to block the path of the rod if the griping means failed. Preferably, the moving crosshead (10) cooperates with further safety means (60-72) to prevent operation of the gripping means except in predetermined, safe positions. The tool could be useful for operations other than plug insertion, such as milling a valve gate.
公开/授权文献
- US5577553A Regenerator 公开/授权日:1996-11-26