| 摘要 |
1. A double-backward self-sealing quick union, including a male element (1) adapted to be inserted into a female element (2) and locked therein by a main locking device provided with balls (3) and a ball covering ring carried by said female element (2), each male and female element including a body (4, 8) which defines a fluid passage and, in said body, a sliding valve means (9, 10) biased to a closing position by a spring (12), valve means of said union elements mutually cooperating to be opened during the coupling action, characterized in that said female element (2) includes a locking device (22, 23, 25) which can be operated by the fluid when passing through said union as an aid to the return spring (25) or as a shifting of the slid-ring (23) according to whether said fluid flows respectively from the female union (2) to the male union (1) or from the male union (1) to the female union (2) in such a way that said locking device opposes said associated valve means (10) being submitted to an opening backward movement beyond a certain determined distance. |
