Peep/Pmax Valve Control; Apl Bypass Valve Control - Dräger Medical Fabius Tiro Technical & Service Manual

Function Description
Figure 31 Pneumatic Control System Schematic
9.1 PEEP/Pmax Valve
Control
9.2 APL Bypass Valve
Control
Dräger Medical AG & Co. KGaA
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When the Fabius Tiro is operating in the automatic mode, the pump on the
pneumatic assembly is running, and the electronic PEEP valve receives a
signal from the main control PCB. The amount of current supplied to the coil
of the electronic PEEP valve is proportional to the PEEP value set by the
operator, and controls the position of the diaphragm within the electronic
PEEP valve. This then determines the control pressure applied to the propor-
tional PEEP valve in the breathing system, which maintains the desired
amount of PEEP during patient expiration. The V1 reservoir smooths out
pressure variations caused by the pump. See
When the Fabius Tiro 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.
6020.002
Fabius Tiro
Figure 29.
Revision B Released
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