PRESSURE RELIEF DEVICE FOR SEALED ELECTRICAL APPARATUS

摘要

A pressure relief device for sealed electrical apparatus. The sealed apparatus comprises a container provided with a cover member having a flared edge which mates with a bead formed on the top of the container. A gasket member is provided between the bead and the flared edge of the cover. A cover band substantially surrounds the container engaging the flared edge of the cover and the lower portion of the bead. A bolt member is provided between the ends of the cover band to draw the cover band tightly against the cover and bead thereby effectively sealing the cover to the container. The gasket, the flared edge of the cover and the mating surface of the bead are designed such that at high pressures within the sealed container the gasket will be displaced, at least into the area of the bolt location of the cover band, thereby venting such high pressures. If desired, a lubricant can be provided to the gasket to minimize friction between the gasket and the mating parts of the cover and tank.