Patent ID: 8726923

Claim:
A safety valve comprising: a gas releasing assembly formed by a main body mounted to a container and by a housing coupled to the main body, the gas releasing assembly including a fusible member which fuses at high temperatures and being adapted to release gas within the container along with the fusion of the fusible member, wherein the main body has a mounting portion inserted in an opening provided in the container and a large-diameter portion having an outer diameter larger than an outer diameter of the mounting portion, the housing is abutted, at a lower surface thereof, against an upper surface of the outer peripheral edge portion of the large diameter portion of the main body, the outer peripheral edge portion of the large-diameter portion of the main body is provided with a plurality of axial through holes, and the housing is provided, from the lower surface, with female screw portions conforming to the respective axial through holes and the main body and the housing are coupled to each other, through a plurality of screws which are inserted from a surface of an outer peripheral edge portion of the main body and screwed in female screw portions provided in the housing, wherein at a state where the safety valve is mounted to the container, the lower surface of the outer peripheral edge portion of the large-diameter portion is closely faced to a surface of the container so that there is a substantially zero slack allowance for loosening of the screws less than approximately one turn due to vibrations.