| 摘要 |
PROBLEM TO BE SOLVED: To supply water with a stable pressure even when the quantity of water to be used is changed. SOLUTION: The system is provided with a main valve 17 for opening/closing a valve port 11 communicating the primary side pressure chamber 8 and the secondary side pressure chamber 8 provided inside a main body 2 energized in a valve closing direction by a spring 19 and formed by partitioning a diaphragm chamber 14 provided on the back side and the primary side pressure chamber 8 with a diaphragm 13 interlocked with the main valve 17, and a pilot conduit 3 provided between the primary side pressure chamber 8 and the secondary side pressure chamber 9 while interposing a pressure reducing valve 4. In the conduit 3, a branch conduit 3a provided on the primary side of the pressure reducing valve 4 is connected to the diaphragm chamber 14, and a restrictor 20 is provided on the upstream side of a branch point. Thus, by restricting the quantity of water to be passed from the primary side pressure chamber 8 of the main body 2 to a primary side pressure chamber 25 of the pressure reducing valve 4 and the diaphragm chamber 14 by using the restrictor 20, the main body 2 is opened by dropping the pressure of the diaphragm chamber 14 when opening the pressure reducing valve 4 for using water, and the secondary side pressure is not considerably dropped by passing, through the main body 2, the water of the same quantity as the quantity of water to be used.
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