This is the name in FM standard, also known as the direct injection variable pump output proportioner in China. The water side and the foam side are respectively provided with a flow meter, the flow meter measurement results are input to the PLC for processing, and then through the relevant valve for pressure and flow regulation, so as to achieve accurate proportioning rate. This kind of proportioner is basically not used in China, but it can still be applied in mobile system, such as fire engines. However, the flow range of this proportioner is limited by the measurement range of the flow meter.

This proportioner is suitable for all kinds of foam agents if the flow meter is correctly selected.