Patent ID: 8607887

Claim:
A closure for sprinklers and nozzles having a nozzle body with an outlet channel containing fluid extinguishant under pressure, said closure comprising: a cover plate, a melt tripping device which connects said cover plate with the nozzle body prior to melting of said melt tripping device, and a spring element compressed against the nozzle body by said cover plate, said spring element having an inner side surface exposed to and urged toward said cover plate by fluid extinguishant under pressure prior to melting of said melt tripping device, said spring element having a peripheral edge portion which seals with said nozzle body to block flow of fluid extinguishant between said peripheral edge portion of said spring element and said nozzle body prior to melting of said melt tripping device, said peripheral edge portion of said spring element moves out of a sealing relationship with the nozzle body upon melting of said melt tripping device to facilitate a flow of extinguishant through the nozzle body.