(Externally) Pressure controlled valves are suitable for the control of gaseous, highly viscose, polluted and aggressive media. The actuator is separated from the medium. Neutral or liquid medium of 4-10 bar is necessary for the actuation.
The pilot valve is available in standard supply voltages and can be delivered, by request. With compressed air being widely available, this type of valve control is preferable for problematic media. On average, only 0.4 liter of air are consumed for each switching. A return line for the control medium air is not necessary because the air will be returned into the atmosphere during the switching periods.