With this, closing is performed both by the force of the compression spring and by the medium pressure. the medium pressure builds up again above the diaphragm through a restrictor port in the diaphragm or through a bypass channel. The system closes as the result of the higher area ratio (above the diaphragm).
- Economical mechanical construction
- Low electrical power consumption
- Good closing-impact damping
- Low pressure differential required.
Servo-assisted 2/2-way solenoid valve, normally closed, with diaphragm. Shown closed at left and open at right