| 摘要 |
<p>The invention relates to a device (1) for an injector (2) in order to mix foam liquid (3) in water (4), comprising a movable piston, which exhibits two piston faces with separate piston areas, i.e. a pressure drop piston (6) and an inlet (7) leading thereto for foam concentrate (3) to the suction side of the injector (2). Said injector (2) is arranged internally in said movable pressure drop piston (6) in order to adjust varying water flow past said injector (2) and with maintained pressure drop. The pressure drop piston (6) exhibits axial passage for water. A dosing valve (8) to the injector (2) is provided to vary occurring water flow changes in order to keep the premix within the intended wanted limits, so that when the water flow (4) past the injector is low, it is so arranged that smaller quantities of foam concentrate (3) are dosed than when the water flow (4) past the injector (2) is increased.</p> |
