| 摘要 |
1. Ball valve of the type in which the plug (3) is displaced angularly with the aid of a mobile rod (6) associated on the one hand with a manoeuvring member (9) provided to be dismountable and on the other hand with an O-ring (7) packing (8) assembly, said packing (8) presenting an annular flange (8b) and a threaded end piece (8a) adapted to screw in a tubular part (1c) of the body (1) of the valve, characterized in that the annular flange (8b) is surmounted by a sleeve-shaped tubular part (8c) which projects beyond the free end (6b) of the rod (6) in order to avoid any manipulation of the latter by persons not having the dismountable manoeuvring member (9), whilst any attempt to dismantle the packing (8) to have access to the free end (6b) of the rod mentioned above is translated by a leak at the level of the O-ring (7) of said rod (6).
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