A pressure regulator can be used to vary the pressure in the liquid reservoir. If the pressure in the reservoir is increased compared to the surroundings and the fluid valve is opened at the same time, liquid is dispensed from the reservoir through the nozzle. The amount of liquid that is dispensed can be adjusted extremely precisely by using the pressure and opening time as the parameters.
This enables a wide range of different volumes, from nl to ml, to be realised. The linear pressure and opening time characteristics enable easy adjustment of the required dispensing quantity. A safety valve is connected directly to the reservoir to prevent excess air pressure from building up in the bottle.
It is important to keep the pressure at the valve as constant as possible. Pressure variations have a direct influence on the dosed volume. The proportional regulator VEAB is therefore used for dynamic pressure regulation. It can regulate a setpoint value with a repetition accuracy of 0.4%.