| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To monitor changing gas pressure accurately and at a low monitoring cost in the condition that the person monitoring is unlikely to have fatigue. <P>SOLUTION: A gas shutoff bag A is structured so that pressurized fluid supplying tubes 2 are connected in communication with the bag body 1 capable of expanding and contracting, the bag body is inserted into a gas pipe in the contracted condition via a through hole formed in the pipe wall and inflated with a pressurized fluid supplied via the tubes, the gas pipe being arranged with its inside capable of being shut, and in the condition that a gas pressure introducing tube 3 is inserted into the bag body and the inside of the gas pipe is shut by the bag body, communication may be generated to inside a pipe located oppositely to the through hole about the shutting position by the bag body, wherein a gas pressure measuring means 4 is connected with the gas pressure introducing tube, and further an informing means 7 is provided to issue a notification about the failure generation information if the measured pressure given by the measuring means is deviated from the reference pressure range. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
