Proportion Range: 0.4% -4%Flow range: 20-2500 liters / hourWater temperature: 4 degrees -30 degreesWorking pressure: 0.2-5 kgOut of water diameter: 25mmPackage includes as below pictue (color may be different ) APPLICATIONwater powered dosing pumps (water is the only driving force) guarantee automatic in line dosing of cleaning agents for bodywork, discaling renovators, disinfectants, auto-driers, wax, cleaners for rims and motors, in car washes etc. for car washing mixer livestock Fertilizer Working Principle:The proportional pump takes the flowing pressure water as power, having small water pressure loss, without any other power facilities. It uses water power of the proportional pump as engine which drives the piston and the connecting rod inside the proportional pump, sucks up the liquid additive directly and makes it dissolve in the water flow. This device moves up and down in a cylinder. When pressing out the water, it uniformly sucks the additives loaded at the bottom of the container into the water flow through a tube. Repeat the up-and-down motion until the effect is achieved that the additive is added to the flowing water evenly and constantly.Note:1.in the use of automatic dosing device to ensure that the container for containing liquid additive is not empty!2. vent valve: at the start of the doser originally, should hold the valve down a few seconds, discharge the inside the air, this process will be a little water, in the exhaust air, quickly close the bleeder valve.