Working principle

The sensor system accurately detects valve stem movement, the

position of the valve at any given time, with an accuracy of

± 0.1mm through the use of microchip sensors. To locate the

current valve position, sensor chips inside the sensor board

calculate the angle between the axial magnetic field produced by

an indication pin mounted on the valve stem.

The solenoid valves receive signals from the PLC system

to activate or deactivate the air-operated valve. It then transmits

feedback signals indicating up to four valve positions and

conditions back to the PLC system.

In the control unit, up to three electric solenoid valves can

physically convert compressed air into mechanical energy to

activate or deactivate the pneumatic valve actuator.

Each control unit fits any Alfa Laval hygienic valve and

provides a tolerance band for valves to prevent product

contamination and failure. This eliminates the need to re-adjust

the sensors and boosts productivity.

LEDs conveniently display all the valve positions, solenoid

activation, setup and local fault indication on the control unit.