发明名称 |
Pressure equalizing safety valve for subterranean wells |
摘要 |
A subsurface safety valve having a valve member with a pressure equalizing mechanism is provided. The valve member includes a bore therethrough for receiving an equalizing plug. A beam is attached to the upper surface of the valve member for transferring downward motion of a flow tube to unseat the equalizing plug, and thereby establish fluid communication through the valve member prior to the opening of the valve member. A retention member is attached to the lower surface of the valve member to upwardly bias the equalizing plug within the plug bore of the valve member.
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申请公布号 |
US6079497(A) |
申请公布日期 |
2000.06.27 |
申请号 |
US19980089554 |
申请日期 |
1998.06.03 |
申请人 |
CAMCO INTERNATIONAL INC. |
发明人 |
JOHNSTON, RUSSELL A.;MARTIN, ANDREW J. |
分类号 |
E21B34/00;E21B34/10;(IPC1-7):E21B34/12 |
主分类号 |
E21B34/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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