This paper describes a new improved structural type of end closure with use of D-shaped shearing bolts by which the head can be opened and closed easily & quickly, and use of metallic self-energized C-ring or O-ring as its sealing gaskets for pressure vessels. Strength analysis and calculation methods for its key components are recommended. This new structure has reliable safety, compact, easy assembly and cost effective in materials etc. Its size and operating pressure should be unlimited, so it can be widely used in industries.

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