Mixing chamber for mixing a gaseous and a liquid component

Mixing chamber for mixing a gaseous and a liquid component, said mixing chamber being provided with separate inlet connections for pressurized components for the mixture which is to be formed, and an outlet connection for discharging the formed mixture to a space which is at lower pressure, said mixing chamber comprising a lower part and an upper part, said upper and lower parts having adjacent surfaces which meet at an inner side wall of said mixing chamber, said upper and lower parts enclosing a pressure body located in the upper region of the mixing chamber and a spring located in the lower region of the mixing chamber which biases the pressure body upwardly, said pressure body and the inner wall of the upper region of the mixing chamber forming an annular space around the pressure body, said lower part having a liquid inlet for passage of a pressurized liquid component into said mixing chamber, at least one of the adjacent surfaces of said upper and lower parts being provided with grooves which define, together with the surface of the other part, narrow channels substantially perpendicular to the longitudinal axis of the mixing chamber and having a transverse dimension equal to or less than 1 mm, said narrow channels opening into said annular space around the pressure body at the upper region of the mixing chamber and providing an inlet for passage of a pressurized gaseous component into said mixing chamber.