| 摘要 |
PROBLEM TO BE SOLVED: To simplify a procedure by simplifying a construction of an apparatus. SOLUTION: Two bolts 17 facing to each other at an angle of 180 degrees of six bolts 17 connecting a flange 1b of a nozzle 1 to a flange 2a of a main valve 2 are removed while nitrogen gas 20 is fed from a branch pipe 11 to the nozzle 1. A nozzle closing fixture 12 having a flat plate part 13 and a wedge part 14 is inserted from the tip end side of the wedge part 14 into a clearance between the flange 1b of the nozzle 1 and the flange 2a of the main valve 2 while the remaining four bolts 17 are loosened gradually. The opening 1a of the nozzle 1 is closed by attaching the flat plate part 13 of the nozzle closing fitting 12 to the flange 1b of the nozzle 1 with an attachment bolt 15 by using the bolt holes 16 from which two bolts 17 were removed, and then the remaining four bolts 17 are removed to separate the main valve 2 from the nozzle 1. The restoration of the main valve 2 is conducted in the reverse procedure. COPYRIGHT: (C)2009,JPO&INPIT
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