The controller is a self-acting pressure reduction controller primarily for use in district heating systems.
The controller is normally open and closes on rising differential pressure.
The controller has a control valve, an actuator with one control diaphragm and a spring for pressure setting.
Further on three valve versions are available:
- VFG 2 for water, with metallic sealing cone
- VFG 21 for water, with soft sealing cone
- VFGS 2 for steam, with metallic sealing cone