초록 ▼

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

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).

대표청구항 ▼

What is claimed is: 1. 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 (3

What is claimed is: 1. 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. 2. The safety valve as set forth in claim 1, wherein the second back-up portion (31) has a surface supported by the alloy (27), which is formed larger in area than the breakable sealing portion (35) opposed to the pressure receiving hole (20). 3. The safety valve as set forth in claim 1, wherein the sealing plate (33) has a peripheral edge portion at which a gasket (32) is airtightly arranged. 4. The safety valve as set forth in claim 1, wherein the sealing plate (33) has a side opposite to the actuation chamber (21), which side is communicated with an interior space (6) of a gas cylinder (2) and the breakable portion (35) is adapted to break up with a gas pressure lower than a pressure normally used within this gas cylinder (2). 5. The safety valve as set forth in claim 1, wherein the first back-up portion (30) is inserted into the pressure receiving hole (20) positioned downstream of the breakable portion (35 ) and has a periphery to which an annular second sealing member (37 ) able to airtightly slide on an inner surface of the pressure receiving hole (20) is attached.