Coupling and hydraulic braking circuit for cycle incorporating such a coupling

A fluid coupling comprising a male element and a female element complementary to the male element, intended to fit in one another along a central axis of the coupling,

• the male element comprising a male body defining an inner fluid circulation channel, the male body being provided with a circumferential stepped outer groove with a front portion and a rear portion adjacent along the central axis, the diameter of the front portion being larger than the diameter of the rear portion, and
• the female element comprising:
• a female body defining an inner cavity with a front part able to receive the male body,
• locking balls radially movable in a housing of the female body, between a locking position of the male body in the female body in a coupled configuration of the coupling and an unlocking position in which the locking balls allow the removal of the male body from the female body;
• a locking ring provided with a circumferential front inner notch and a circumferential rear inner notch axially separated by a circumferential inner rim, the locking ring being movable between a forward position, where the rear inner notch keeps the locking balls in the locking position, and a retracted position, where the front inner notch is radially aligned with the locking balls such that the locking balls can reach their unlocking position,
• a spring that pushes the locking ring to the forward position,
• a valve movable in the female body between an open position and a closed position of a rear part of the inner cavity and pushed back by a spring toward its closed position,
• when the locking balls cooperate with the front portion of the stepped outer groove of the male body fitted in the female body, the locking balls form an obstacle to the inner rim of the locking ring along the central axis, when the locking balls cooperate with the rear portion of the stepped outer groove, the locking balls are able to be released relative to the inner rim,
• in the coupled configuration of the coupling, the locking balls are engaged with the front portion of the stepped outer groove and the rear inner notch;
• wherein the male element comprises a valve movable in the inner channel of the male body between an open position and a closed position of the inner channel, and a spring that pushes the valve of the male element toward the front of the male element toward its closed position,
• wherein the valve of the male element is formed by a front part, a rear part and at least one connecting member that are separate parts, the connecting member being able to abut axially against an inner surface of the inner channel when the valve of the male element is in the closed position of the inner channel,
• and wherein the maximum radial dimensions of the front part, the rear part and the connecting member are smaller than the minimum inner diameter of a cylindrical nozzle surface of the inner channel of the male element, such that the front part, the rear part and the connecting member can be inserted into the inner channel of the male element by the front of the male body.