| 摘要 |
PROBLEM TO BE SOLVED: To allow efficient and easy work for replacing fluid equipment in the state of avoiding or reducing water leakage by utilizing a connection flange portion of the fluid equipment such as an air valve. SOLUTION: In a fluid pipe system where the connection flange portion 3A of the fluid equipment 3 and a connection flange portion 2A of a connection pipe part 2 on the upstream side thereof are connected to each other with a first fastener 4, a gap is formed between both connection flange portions 2A, 3A by the loosening operation of the first fastener 4 and a flow path is shut off by a partition plate valve 8 inserted through the gap. As part ranging to the connection flange portion 3A of the fluid equipment is left, other parts are removed and a flow path closing device E is fastened and connected to each of the connection pipe portion 2 and a remaining equipment portion 3B. Then, the partition plate valve 8 is pulled off, a closing means F for the flow path closing device E is inserted into the connection pipe portion 2 to close the flow path, others than the closing means F being left in a flow path closing state are removed, specified fluid equipment 5 is connected thereto via an on-off valve 6 in a sealed state, and the partition plate valve 8 and the remaining structural member of the flow path closing device E are withdrawn. COPYRIGHT: (C)2007,JPO&INPIT
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