Apparatus for shutting off flow of gaseous drilling fluid responsive to temperature in the bore hole专利检索- 防火或灭火的方法或设备专利检索查询-专利查询网

Apparatus for shutting off flow of gaseous drilling fluid responsive to temperature in the bore hole
申请号	US18537862	申请日	1962-04-05	公开(公告)号	US3151688A	公开(公告)日	1964-10-06
申请人	ARNOLD AIR DRILLING SERVICE;			发明人	YOUNG JAMES J;
摘要
权利要求	1. A DEVICE FOR BLOCKING DOWNWARDLY FLOW OF A GASEOUS MEDIUM THROUGH A DRILL PIPE, INCLUDING A SUBSECTION OF DRILL PIPE FOR CONNECTION INTO SAID DRILL PIPE, MEANS WITHIN THE SUBSECTION FOR PROVIDING AN UPWARDLY FACING SEAT ENCIRCLING THE FLOW OF GASEOUS MEDIUM, A VALVE FOR SAID SEAT, SAID SUBSECTION HAVING AN OPENING THROUGH A SIDE WALL THEREOF AT A POINT ABOVE SAID SEAT, A FUSIBLE ELEMENT CLOSING THE OPENING AND SUBJECT TO TEMPERATURE SURROUNDING THE SUBSECTION, MEANS CONNECTED WITH THE FUSIBLE ELEMENT FOR NORMALLY HOLDING SAID VALVE IN OPEN POSITION,
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