Abstract: The invention relates to a fluid premixer for mixing a first fluid and a second fluid by aspirating the second fluid into the first fluid by Venturi effect. The premixer comprises a pipe which has a first inlet for the first fluid at a first pressure and a second inlet for the second fluid to be mixed into the first fluid to form a mixture. The pipe also has an outlet for the mixture at a second pressure and a shutter movable between several positions where each position defines a distinct degree of shutting of the pipe. The premixer also includes a control element to control the position of the shutter as a function of the difference between the first pressure and the second pressure.

Abstract: The invention relates to a fluid premixer for mixing a first fluid and a second fluid by aspirating the second fluid into the first fluid by Venturi effect, the premixer comprising a pipe (12) including: a first inlet (16) for the first fluid at a first pressure, a second inlet (18) for the second fluid to be mixed into the first fluid to form a mixture, an outlet (22) for the mixture at a second pressure, and a shutter (24) of the pipe (12) movable between several positions each defining a distinct degree of shutting of the pipe (12), the premixer further including a control element (34) able to control the position of the shutter (24) as a function of the difference between the first pressure and the second pressure.