| 摘要 |
A safety valve comprises a pressure receiving hole ( 20 ), an actuation chamber ( 21 ), a discharging hole ( 22 ) and an alloy accommodating chamber ( 25 ). An alloy ( 27 ) of a low-temperature melting point is accommodated within the alloy accommodating chamber ( 25 ). A sealing plate ( 33 ) seals the pressure receiving hole ( 20 ). This sealing plate ( 33 ) has 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 ) is arranged within the actuation chamber ( 21 ). The actuator ( 28 ) has one end formed with a first back-up portion ( 30 ) which supports the breakable sealing portion ( 35 ) and has the other end formed with a second back-up portion ( 31 ) which is supported by the alloy ( 27 ).
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