Abstract: Valve with a direct passage and rotary control including a body sealed by a cover and both of which are provided with an orifice, and wherein the valve also includes two coaxial plates having in each case an orifice and positioned between the body and the cover, a ratchet mechanism interconnecting the plates under the action of elastic means when the valve is open, the four orifices then being aligned, a stop member integral with the cover, a lug integral with the first coaxial plate disposed in the vicinity of the bottom of the body and cooperating with an opening in the second plate close to the cover, an O-ring joint intended for sealing the orifice of the body when compressed by the first coaxial plate and a drive mechanism for rotating the two coaxial plates in such a way that, starting from the valve open position, the lug of the first coaxial plate abuts against the stop member, the second coaxial plate then rotating alone by a fraction of a turn, the first coaxial plae thus moving axially away from th