CPC F16J 13/24 (2013.01) [F16J 13/065 (2013.01); F16L 55/115 (2013.01)] | 8 Claims |
1. A closure [10] for a cylindrical vessel, the closure comprising:
a pair of clamp rings [31] having a predetermined actuation force above the weight of the pair of clamp rings;
a pressure warning lock hole [19]; and
a block [40] connected to the pair of clamp rings and sized to at least partially overlap the pressure warning lock hole when the pair of clamp rings is in a fully open state and to fully expose the pressure warning lock hole when the pair of clamp rings is in a fully closed state.
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