Solenoid valves, servo-assisted, 2/2-way

In this case, a plunger-type solenoid is used as the pilot valve. The main valve seat is opened and closed by means of a diaphragm. 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).

Advantages:
- 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