Quick acting safety coupling for the disconnectable connection of pipe lines

The quick safety connector comprises a male (A) and female (B) fitting which are locked one inside the other. A controlled lock axially immobilizes the male fitting in a connection position while retaining balls (40,41) immobilize this fitting, after releasing it from the lock, in an intermediate discharging position of the pipe (C1) connected to the male fitting. The lock and the retaining balls are controlled by a sheath (60) sliding around the body (2) of the female fitting. Vents and/or a safety collar (200) limit the movement of the sheath under the effect of the pressure (P) existing in its internal volume (V,C) because of the discharge from the upstream pipe in the intermediate position, to a release position of the male fitting from the retaining part.