A quick coupling for sealably joining fluid conduits (C1, C2), including a male element suitable for being connected to a first conduit and a female element suitable for being connected to a second conduit, the male element including: - a male body provided with a locking relief and defining an inner channel in communication with the first conduit, - a purging ring of the first conduit, surrounding the male body, and movable between a rear position, in which the purging ring closes off a purging passage of the male body, and a forward position, in which the purging ring no longer closes off the purging passage, the female element including: - a female body (12, 14, 16) defining an inner channel in communication with the second conduit, - a ball-retainer (23; 90) arranged inside the female body (12, 14, 16), forming a receiving housing of the male body and bearing locking balls of the male body, said locking balls being movable in a housing between a first position, in which they are able to oppose the removal of the locking relief, and a second position, in which the locking balls allow the removal of the locking relief, - a valve body (25; 90) secured to the ball-retainer (23; 90), translatable in the female body (12, 14, 16) between a forward position, in which it closes off the fluid passage toward the second conduit, and a rear position, in which the passage toward the second conduit is open, the valve body (25; 90) including coupling balls (27; 18) suitable for securing the valve body and the female body (12, 14, 16) in translation, - an inner ring (29; 92) arranged inside the valve body (25; 90), suitable, in a retaining position, for keeping the valve body (25; 90) and the female body (12, 14, 16) coupled by the coupling balls (27; 18) when the female element is uncoupled from the male element, the coupling being characterized in that: - in a first coupling configuration by bringing the male element and the female element closer together, the locking balls have crossed the locking relief of the male element, - in a second coupling configuration by coming closer together, the inner ring (29; 92) has reached a position in which it no longer keeps the valve body (25; 90) and the female body (12, 14, 16) coupled by the coupling balls (27; 18), - in a third coupling configuration by coming closer together, the female body (12, 14, 16) keeps the locking balls in their first position, - in a fourth coupling configuration by coming closer together, the valve body (25; 90) has reached a position that allows fluid to pass between the two conduits (C1, C2), - the female element includes steering means (32; 36) able to drive the purging ring from its rear position toward its forward position during the uncoupling of the male and female elements by moving away from one another. - a male body provided with a locking relief and defining an inner channel in communication with the first conduit, - a purging ring of the first conduit, surrounding the male body, and movable between a rear position, in which the purging ring closes off a purging passage of the male body, and a forward position, in which the purging ring no longer closes off the purging passage, - a female body (12, 14, 16) defining an inner channel in communication with the second conduit, - a ball-retainer (23; 90) arranged inside the female body (12, 14, 16), forming a receiving housing of the male body and bearing locking balls of the male body, said locking balls being movable in a housing between a first position, in which they are able to oppose the removal of the locking relief, and a second position, in which the locking balls allow the removal of the locking relief, - a valve body (25; 90) secured to the ball-retainer (23; 90), translatable in the female body (12, 14, 16) between a forward position, in which it closes off the fluid passage toward the second conduit, and a rear position, in which the passage toward the second conduit is open, the valve body (25; 90) including coupling balls (27; 18) suitable for securing the valve body and the female body (12, 14, 16) in translation, - an inner ring (29; 92) arranged inside the valve body (25; 90), suitable, in a retaining position, for keeping the valve body (25; 90) and the female body (12, 14, 16) coupled by the coupling balls (27; 18) when the female element is uncoupled from the male element, - in a first coupling configuration by bringing the male element and the female element closer together, the locking balls have crossed the locking relief of the male element, - in a second coupling configuration by coming closer together, the inner ring (29; 92) has reached a position in which it no longer keeps the valve body (25; 90) and the female body (12, 14, 16) coupled by the coupling balls (27; 18), - in a third coupling configuration by coming closer together, the female body (12, 14, 16) keeps the locking balls in their first position, - in a fourth coupling configuration by coming closer together, the valve body (25; 90) has reached a position that allows fluid to pass between the two conduits (C1, C2), - the female element includes steering means (32; 36) able to drive the purging ring from its rear position toward its forward position during the uncoupling of the male and female elements by moving away from one another.