发明名称 |
VALVE A ASSERVISSEMENT MONTEE DANS UN TRAIN DE TIGES DE FORAGE |
摘要 |
<p>An auxiliary controlled valve including a valve body (8) displaceable against a valve seat (9) disposed in a drilling string (6) to produce pressure pulses in drilling fluid renders possible a selective closing or opening of a low-resistance transmission section (12) which lies parallel to a main throttle section (10). The valve has a central passage which permits the passage of measuring instruments through the valve regardless of the particular position of a valve body (8). The valve body (8) is largely balanced out with regard to dynamic flow forces so that only a comparatively small actuating force is necessary.</p> |
申请公布号 |
FR2532987(B1) |
申请公布日期 |
1986.05.16 |
申请号 |
FR19830013532 |
申请日期 |
1983.08.22 |
申请人 |
NORTON CHRISTENSEN INC |
发明人 |
RUDOLF ROPER |
分类号 |
E21B34/08;E21B21/10;E21B34/06;E21B47/18;(IPC1-7):E21B21/10;H04B13/02;E21B47/12;F16K1/00;F16K17/00 |
主分类号 |
E21B34/08 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|