Copyright by Servizio Clienti ANGELO PO Spa
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2.2. Closed valve operation
With the valve closed, the steam can not escape from the vent pipe 6, or from the tube 5 at
least until the pressure inside the cooking chamber is not sufficient to overcome the effect
of decompression generated by the rotation of the fan (usually 1,5-2,0 mBar). But when the
pressure chamber exceeds the decompression generated by the fan, the steam excess is
expelled through the tube 5. The system operates as a closed system, where the
overpressure valve (overpressure valve in the FM ovens) is dynamically replaced by the
effect of decompression generated by the fan. Even in this mode, water is sprayed by the
injector 12 in order to maintain the siphon full.
Note that, unlike than the FM, the condensate tube 14 is connected upstream of the swing
of the siphon, as with the motorised valve closed the vent pipe 6 and the drain tube 14 are
at the same pressure of the cooking chamber.
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