Patent ID: 6415870
Filing Date: 2002-07-09
Classification: A62C

Abstract:
A wet-type sprinkler system comprising:sprinkler heads for being individually actuated; a water supply unit for supplying water to said sprinkler heads; a feed pipe arrangement having at least one primary pipeline connected to said water supply unit, at least one secondary pipeline connected to said sprinkler heads, and a valve section which is closed in a normal condition to interrupt communication between said primary pipeline and said secondary pipeline, said feed pipe arrangement forming a water supply line from said water supply unit to said sprinkler heads; a fire detecting unit for outputting a fire-detection signal in response to detection of a fire state; a control section for controlling said water supply unit and the opening and shutting of said valve section in response to said fire-detection signal; said primary pipeline and said secondary pipeline of said feed pipe arrangement both being filled with water under a normal condition; a negative-pressure-securing unit for causing to maintain water in said secondary pipeline in a negatively pressurized state; and said negatively pressurized state of water is ensured under a normal condition.