The dispense head VTOE was the first modular complete solution developed by Festo for quickly and accurately dispensing extremely small quantities of liquids. Festo was thus able to offer customers an integrated system for liquid handling, including kinematics, that is based on the functional principle of pressure over liquid.
By using a proportional pressure regulator, such as the VEAB, pressure is built up in a filled reservoir. The liquid is delivered to a dispense head or a media-separated valve via an additional line. By opening and closing the valve (e.g. VYKA or VYKB) the liquid is dispensed via special fluidic push-in fittings (NLFA) using a dispensing needle (VAVN). The pressure and valve opening time can be used to regulate how much liquid is dispensed. The opening times can be easily adjusted, for example with the valve control module VAEM. Thanks to this setup and a suitable handling system, microwell plates in laboratory automation applications can be precisely filled in no time at all.