Explosion discharge valve

A valve for discharging pressurized fire extinguisher fluid from a container, including the combination of a valve housing formed with a passage communicating with the interior of the container, a diaphragm mounted in the housing across the passage, said diaphragm comprising a thin-walled cup-shaped center portion and an integral peripheral rim which includes a ring formed of a ductile metal, said center portion being positioned within the passage in a direction convex away from pressurized fluid of the container, means forming a hermetical seal about the rim for normally sealing fluid within the passage, said seal means comprising means in the housing forming an annular knife-shaped edge about the passage with the edge abutting the diaphragm rim on a side thereof which is normally exposed to pressurized fluid in the passage from the container, the housing including means for releasably urging the ring against the knife-shaped edge whereby the edge forms and seats into an annular groove in the metal of the ring and whereby the ring can be released for moving and replacing the diaphragm, and explosive charge means oriented toward the diaphragm center portion on the convex side thereof for rupturing the diaphragm and permitting discharge of fluid from the container along the passage.