Automatic foam blender doser for fire extinguisher.

摘要

P Additive dosing mixer for the water of a fire extinguisher. BR/ It comprises a double venturi (12) and two separate supply lines (5, 10) of additive, each containing a respective choke element (6, 11). A shutter (20) pushed back by a spring (21) releases either the outer venturi (13) or the two venturis (13, 18). A check valve (7) cooperating with a regulating member (3), regulates the passage of the additive in one of the pipes (10) or in both (5, 10) depending on the flow rate of the water. BR/ Application to the automatically dosed incorporation of a wetting or foaming agent in the water of fire protection devices. / P