A water spraying control unit includes a fire extinguishing sprinkler head. The sprinkler head receives a branch pipe from a pipe line arranged in the ceiling of a building and the sprinkler head suppresses fire by discharging pressured water due to separation of a heat sensing plate and a nut supporting...http://www.google.es/patents/US6129153?utm_source=gb-gplus-sharePatente US6129153 - Water spraying control unit for a fire extinguishing sprinkler head
Water spraying control unit for a fire extinguishing sprinkler head
