Dosing system for fire fighting with selectable fixed additive 1%, 2%, 3%, 4%, 5% and 6% – for fixed installations connected to a concentrate tank with gravity feed to the dosing pump. It mainly consists of two volumetric parts; a water engine and a piston pump. Equipped with a manual air relief valve. The dosing pump can be flushed with a separate flush valve after closing the dosing valve (no. 4.1 and 4.2 in the flowchart). Special designed volumetric water motor using 8 vanes extending from the rotor to make smooth rotation and volumetric function without using movable elastomer seal
