A delivery pressure of 3 - 6 bar feeds the medium to be dosed to the dosing chamber via the valve connection block. A dynamic pressure relieved non-return poppet valve built into the outlet of the VDV dosing chamber prevents the uncontrolled release of the dispensing medium up to a pressure of 6 bar. Dosing volumes can be manually adjusted on a continuous basis via the rotary valve cylinder, which restricts the stroke of the dosing piston.
Triggered by a mono-stable 3/2-way valve, the dosing piston in the valve cartridge is pressurised, thus forcing the spring loaded plunger into the dosing chamber without any clearance.