Even if a fire occurs in a high-rise building, it is possible to quickly extinguish the initial fire, and even if a failure occurs in the electric equipment or the fire pump, the fire can be suppressed. A digesting water supply system capable of preventing a breakage phenomenon caused by an overpressure in a pipeline and capable of supplying sufficient digestion water equal to or greater than a legal digestion water source capacity is disclosed. The fire extinguishing water supply system can quickly evolve early in the event of a fire in a high-rise building, thereby securing safety against fire occurrence and customer reliability.
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