Ventilator Mechanical Subsystems; Drive Gas Filter And Gas Inlet Valve - GE Datex-Ohmeda Aisys Carestation Reference Manual

Aisys

2.13 Ventilator mechanical subsystems

2.13.1 Drive gas
filter and Gas Inlet
Valve
2-60
Refer to Figure 11-1, "System circuit diagram" in Section11, for the complete
pneumatic/mechanical subsystem diagram.
The mechanical subsystems for the ventilator include:
Pneumatic Vent Engine
• Drive gas inlet filter
• Gas inlet valve
• Supply gas pressure regulator
• Flow control valve
• Drive gas check valve
• Mechanical Overpressure Valve (MOPV)
• Bleed resistor
• Free breathing valve
Exhalation valve
Bellows assembly
Breathing circuit flow sensors
Drive gas (O or Air) enters the Vent Engine (1) at a pressure of 241 to 690 kPa (35 to
2
100 psi) through a 2-micron filter (2) that is located under the Gas Inlet Valve (3).
During normal operation the Gas Inlet Valve (GIV) is open to let supply gas flow. The GIV
shuts off supply gas to the ventilator under failure conditions detected by the CPU or
over-pressure switch. The output from the GIV stays at the filtered supply gas pressure.
1
3
2
Figure 2-47 • Inlet filter and Gas Inlet Valve (GIV)
Drive Gas Check Valve
(3.5 cm H2O bias)
Inspiratory Flow
Control Valve
25 psig @
15 LPM
Gas Inlet
Valve
Vent to Ambient
P
04/08 M1046983
Exh
(2.0
5.