Patent ID: 7111818

Claim:
A safety valve comprising a pressure receiving hole ( 20 ), an actuation chamber ( 21 ), a discharging hole ( 22 ) and an alloy accommodating chamber ( 25 ), a sealing member ( 34 ) sealing the pressure receiving hole ( 20 ) so as to be able to cancel the sealing, the sealing member ( 34 ) being supported by an alloy ( 27 ) of a low-temperature melting point accommodated within the alloy accommodating chamber ( 25 ), the sealing member ( 34 ) being composed of a sealing plate ( 33 ), this sealing plate ( 33 ) having at least a portion, which faces the pressure receiving hole ( 20 ), provided with a breakable sealing portion ( 35 ) that breaks up with a predetermined pressure, an actuator ( 28 ) being arranged in the actuation chamber ( 21 ), the actuator ( 28 ) having one end formed with a first back-up portion ( 30 ) which supports the breakable sealing portion ( 35 ) and having the other end formed with a second back-up portion ( 31 ) which is supported by the alloy ( 27 ) of the low-temperature melting point.