| 摘要 |
<p>PURPOSE: To guarantee high degree functional certainty and sealing property of a hole drilling type pipe joint combined with a valve in drilling a hole and with respect to a valve function. CONSTITUTION: A guide bush 24 for a drill 34 is arranged in a valve short pipe 8 so as to prevent the travel in the direction of axial line and rotation in a hole drilling type pipe joint. This guide bush 24 extends at least across an opening region of a branched short pipe of the valve short pipe 8 and is provided with an opening 28 in a region of the branched short pipe 10, and a valve seat 32 is provided in a lower end part of the guide bush 24.</p> |
