| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative pressure wet sprinkler system which prevents erroneous water discharge even with many folding parts and discharges water without delay in case of a fire. SOLUTION: The negative pressure wet sprinkler system includes a sprinkler head 2, a water supply pipe 5 having a primary pipe 3 and a secondary pipe 4, a valve 6, a pressure water supply device 8, a fire detector 9, a control section 10, and a negative pressure condition securing means 11. One end of a suction pipe 25 is connected to a suction branch pipe 12a near a rising branch pipe 4a and the other end of the suction pipe 25 is blocked and is extended to the end side of the secondary pipe. The secondary pipe 4 and the suction pipe 25 at a high setting position S face are connected by an open/close means 26 that opens when the pressure difference is smaller than a set pressure difference and closes when the pressure difference is equal to or larger than the set pressure difference. The suction pipe 25 has at a position near the rising branch pipe 4a a check valve 27 that opens in the direction of the suction branch pipe 12a. COPYRIGHT: (C)2011,JPO&INPIT
|
