Dräger Savina 300, Technical Documentation Manual, Page: 25 / 166

Savina 300
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Function descriptions
Pneumatic assembly
Pneumatic safety devices
The pneumatic safety valve D1 ensures that the ventilation pressure cannot
rise above 120 mbar. In the event of inspiratory stenosis the pressure is lim-
ited by opening the expiratory valve. The mechanical vacuum valve D2
ensures (except in the case of inspiratory stenosis) that the patient can
breathe ambient air in case of a fault.
The pneumatic emergency vent valve V9 relieves the pressure in the breath-
ing system in a case of expiratory stenosis if the pressure cannot be relieved
through the expiratory valve. To do so, the electric emergency vent valve
(pilot valve) V8 actuates the emergency vent valve V9 accordingly.
Fig. 13 Detail view of functional diagram; pneumatic safety devices
Drug nebulizer
The drug nebulizer is operated with 100% oxygen. The pressure regulator
DR1 ensures in the case of widely varying supply pressure (2.7 to 6.0 bar)
that the pneumatic drug nebulizer receives a constant supply pressure of
2 bar.During the nebulizing phase the solenoid valve V5 operates in an “inspi-
ration” (open position) and “expiration” (closed position) cycle. When the neb-
ulizer function is inactive the nebulizer switching valve V5 is closed.
Fig. 14 Detail view of functional diagram; drug nebulier