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- Plumbing Valves - 3/8" Standard Fire Valve
Plumbing Valves - 3/8" Standard Fire Valve. The Screw Cap consists of two parts, an outer section A, and an inner circular block, which is gripped in the cap with a low melting point solder. Fire Valve Characteristics: When the valve is subjected to a temperature of about 85 degrees C, the solder melts and the inner block is released allowing an integral spring to slam the valve spindle closed, thus shutting off the oil supply.