| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a gas block device allowing a safe welding repair by perfectly interrupting a gas fluid in the front of a repairing position within a pipe. SOLUTION: This gas block device 1 to be inserted to the pipe 3 for passing the gas fluid 25 to isolate a prescribed position 31 of the pipe 3 from the gas fluid 25 comprises a gas recovery pipe 17 for discharging the gas fluid 25; a sealing member interposed between the gas recovery pipe 17 and the pipe 3; a gas insert pipe 18 for introducing an inert gas to the sealed space of the sealing member; and a gas discharge pipe 19 for discharging the inert gas 24. The sealing member comprises a tip ring 13, O-rings 15 and 16, an intermediate ring 24 and a fastening pipe 12.</p> |
