Patent ID: 9643829
Date: 2017-05-09
CPC Classifications: B67D

Claim:
1. A closure for a pressure vessel, the closure comprising: a housing; at least one valve element that is movable with respect to the housing, inwardly into an open state and outwardly into a closed state; and a lock mechanism having a locking element that is movable with respect to the housing and is capable of holding the valve element in the open state, the locking element having an outer end and an inner end; wherein the lock mechanism includes first and second couplings at which the locking element and the valve element are mutually engageable, and is arranged such that when the locking element and the valve element are engaged at the first coupling, the locking element moves outwardly together with the valve element as the valve element moves from the open state into the closed state, said movement of the locking element enabling engagement between the locking element and the valve element at the second coupling, which engagement at the second coupling occurs on subsequent movement of the valve element into the open state to prevent the valve element returning to the closed state.