| 摘要 |
<p>A safety valve 1 comprises a main body 2, fixed body 2, meltable body 7, movable body 8, biasing member 9, movable plug 10 and plug holding means 11. The fixed body 2 has a small axial passageway 14 communicating with the interior of a container T, and a large axial passageway 15 having an upper-end opening. The movable plug 10 has a small rod portion 18 fitting in the upper end of the small axial passageway 14 of the fixed body 2, an intermediate rod portion 19 providing a clearance therearound inside a lower end portion of the large axial passageway 15 of the fixed body 2, and a large rod portion 20 slidably fitting in an intermediate portion of the large axial passageway 15 of the fixed body 2. The large rod portion 20 of the movable plug 10 has an axial passage 21 extending from the upper end thereof to the lower end thereof, and the intermediate rod portion 19 of the plug 10 is provided with communication passageways 22 having openings in a peripheral surface thereof and communicating with the lower end of the axial passage 21. <IMAGE></p> |
