Apl Bypass Valve Control - Dräger Medical Fabius GS Technical & Service Manual

Function description
9.2 APL bypass valve
control
40
Figure 31 Pneumatic control system schematic
When the Fabius GS is operating in the automatic mode, the pneumatic
assembly provides a vacuum signal to hold open the APL bypass valve in the
breathing system. The V2 reservoir and filter provide noise damping, and the
variable restrictor is used to set the vacuum level in the range of –150 to –240
cmH2O (mbar).
When the machine is operating in the Manual mode, the pump on the pneu-
matic assembly (and the ventilator) is stopped, and the spring-loaded APL
bypass valve in the breathing system closes, directing exhaled gas through
the APL valve.
Fabius GS
5330.500