| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a decompression device wherein there is no occurrence of chattering nor excessive increase of secondary side pressure especially even if a use amount of water is significantly reduced. Ž<P>SOLUTION: In this decompression device, a direct acting decompression valve 3 wherein responsiveness of an opening/closing valve in a small flow rate area is excellent, wherein the chattering does not occurs, and wherein the secondary side pressure does not increase as compared to a set pressure for valve closing, because the direct acting decompression valve has a configuration wherein a valve element is directly driven, and a pilot type decompression valve 4 suitable for water supply of a large flow rate are plumbed in parallel, and the set pressure of the direct acting decompression valve 3 is set to higher than a set pressure of the pilot type decompression valve 4. Thereby, the pilot type decompression valve 4 is certainly precedingly closed, the direct acting decompression valve 3 is in the middle of valve opening as the whole decompression device 1 even when the secondary side pressure increases at that time, so that its pressure is discharged from a bibcock such as a faucet during use installed to an end of a water supply pipe 2, and thereafter the direct acting decompression valve 3 is closed. Thereby, because the whole decompression device 1 is fully closed, the occurrence of the chattering or the excessive increase of the secondary side pressure is nil. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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