The new compact valves from Bürkert use two different drive and valve concepts, depending on the orifice size: the first is based on linear drive seat valves for orifices DN2 to DN6 (Type 3270: shut-off valve, Type 3280: proportional valve).
The new valves are designed for space-saving and energy-saving operation and offer an alternative to the known solenoid valves in less dynamic applications which do not require response times in the millisecond range.
Compared with valves of competitors, the motor actuated valves from Bürkert are dynamic with closure times of only 2.5 s (about 4 s for disc valves).
They also feature low energy consumption, due to negligible holding power for a defined valve opening position and extremely precise positioning thanks to high-quality electric stepper motors. In addition, they achieve a higher flow coefficient in comparison to solenoid valves with the same orifice.
The compact valves can be used with combustible gases at pressures from 0 to 3 bar, with neutral gases and liquids up to 6 bar.
Seals of FKM or NBR and a body of polyphenylene sulfide and polycarbonate make them very robust and are designed for an ambient temperature from -10 to 60 °C and fluid temperatures from 0 to 70 °C.
The electrical connection to the power supply, measuring lines and process controller is achieved in the standard version (with end position detection) by means of a standard M12 connector (8-pin).
The integrated electronics facilitate commissioning by eliminating the need for additional control electronics.
Additional versions of the motor-driven proportional valves will be added in the future: the positioner version (for fieldbus communication and with integrated displacement measuring system), as well as the process controller version, (based on the positioner version with additional sensor signal inputs).