| 摘要 |
A fusible bung for sealing an opening in a threaded flange on a liquid container. The bung is formed as a unitary body of polymeric material that includes cylindrical, concentric interior and exterior walls separated by a vent passage and interconnected by a unitary venting fuse. The exterior wall is threaded for mounting of the bung and includes an annular shoulder and separate sealing ring for providing a gas-tight seal to the container flange. The interior wall is supported by the exterior wall via the venting fuse, which is formed during molding of the bung as a thin-walled section of the polymeric material which melts and ruptures at elevated temperatures. The central region within the interior wall can include either a unitary cover member or can have a threaded bore to receive a separate relief valve.
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