| 摘要 |
PROBLEM TO BE SOLVED: To solve problems of a conventional bypass flow passage mechanism of a support mechanism of aqueduct equipment for ensuring passing water during work wherein face to face distance becomes long because a change-over valve is arranged on only primary side holder port and the equipment, an opening and closing valve, and a junction pipe are arranged in series on a secondary side and back flow to a meter side when water passes through the equipment is not completely prevented because control of flowing water by a bypass flow passage is exclusively performed by the equipment opening and closing valve. SOLUTION: Holder ports 1, 2 of a primary side pipe and a secondary side pipe are mutually connected by the bypass flow passage 3, and flow passage change-over valves 12, 22 for switching equipment passing water, bypass passing water, and stop of water are provided in each holder port on the primary and secondary sides. COPYRIGHT: (C)2005,JPO&NCIPI
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