Bosch Sensixx B35L Repair Instructions page 15

by: openings are very short, so the steam pressure can be
maintained to maximum, and the steam flow is higher
("ultimate steam").
21. Steam outlet to the iron: through the valve of the steam flow
control.
22. Air inlet into the water tank: during the expulsion of steam,
the deposit must be in contact with the air, to avoid the
creation of vacuum in the boiler. To do this, the solenoid valve
includes an air inlet from the outside.
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