| 摘要 |
A nitrogen die cylinder is disclosed having an upright post threaded at its lower end into the wall of a manifold containing nitrogen at high pressure. The post has a central vertical passageway extending therethrough and communicating with the manifold. A cylindrical sleeve having a top wall is telescoped over the post. A seal at the upper end of the post engages the bore of the sleeve to form a chamber between the seal and the top wall of the sleeve which, when pressurized, urges the sleeve upwardly on the post. The top wall of the post has a noncircular socket therein which is accessible through an opening in the top wall of the sleeve which is normally closed and sealed by means of a threaded plug.
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