Powered Flame Modulation Valves - Electrolux Hob Service Manual

4.4.3

POWERED FLAME MODULATION VALVES

The flame control valves comprise two sections: the modulation section and the safety valve section.
Fig. 11
1 - ELECTRICAL CONNECTORS (FASTONS)
2 - CONNECTOR FOR MODULATION MOTOR
3 - VALVE SOLENOID
4 - MODULATION MOTOR (STEPPING LINEAR
ACTUATOR)
5 - GAS INLET COUPLING
6 - GAS DELIVERY COUPLING
The modulation section SM comprises a pressure regulator which, by means of a stepping linear actuator
APP, compresses the regulation spring M1 , thus obtaining one of the six levels of closure of element O1.
The output pressure varies according to the compression of the spring M1 and therefore according to the
electronic control system.
When actuator APP is in the minimum compression position of spring M1, the closing element O1 is
forced into the closed position by spring M2. On the contrary, when the actuator is at maximum position
(i.e. when the flame is at maximum setting), the closing element O1 is forced into the completely-open
position.
In this way the SM assembly acts as a modulator for the delivery pressure and therefore for the power of
the burner (flame setting). The SM assembly also serves to cut off the gas.
The safety solenoid section EV consists of a control coil EM and a closure element O2, and acts as a
safety valve.
Fig. 12
APP - LINEAR STEPPING ACTUATOR (MOTOR)
EM - CONTROL COIL
EV - SAFETY VALVE
M1 - REGULATION SPRING
M2 - CLOSURE SPRING
O1 - MODULATOR CLOSING ELEMENT
O2 - CLOSING ELEMENT FOR SAFETY VALVE
SM - MODULATOR
SOI 04.05 FV 20/57 599 36 62-62