| 摘要 |
PROBLEM TO BE SOLVED: To surely supply fire extinguishing water for replenishment from bypass piping to prescribed piping. SOLUTION: Sprinkler fire extinguishing equipment comprises the bypass piping for evading a preoperation valve for keeping a normally closed state, connecting primary side piping and secondary side piping at a low flow rate and maintaining the same pressure, and a check valve provided in the bypass piping, provided with a downward secondary side opening opposing an upward primary side opening and provided with a valve body capable of sealing one of them depending on a flowing water direction between the primary side opening and the secondary side opening. An elastic body having an opening for forming a clearance when the valve body is abutted is arranged near the secondary side opening of the check valve, and the valve body seals flowing water to the secondary side opening by the increase of a flowing water amount to the secondary side opening. COPYRIGHT: (C)2005,JPO&NCIPI
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