发明名称 |
Rotating piston for ball and seat valve assembly and downhole pump utilizing said valve assembly |
摘要 |
Disclosed is an assembly for unseating a seated traveling valve ball, and pumps utilizing such an assembly. The assembly generally includes a tubular member having therein a piston with an actuator for engaging the ball. Mechanical advantage is provided either by providing a sealing area of the piston that is greater than the sealing area of the seat valve and/or by providing a engaging member suitable to strike to seated ball asymmetrically with respect to the vertical axis through the center line of the ball.
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申请公布号 |
US5893708(A) |
申请公布日期 |
1999.04.13 |
申请号 |
US19970784600 |
申请日期 |
1997.01.21 |
申请人 |
NELSON, II, JOE A. |
发明人 |
NELSON, II, JOE A. |
分类号 |
E21B31/107;E21B34/06;E21B34/14;E21B43/12;F04B7/00;F04B47/02;F04B53/10;F04B53/12;F16K15/18;(IPC1-7):F04B53/12 |
主分类号 |
E21B31/107 |
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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