GE 9100c - Drive gas; Pressure Regulator; Inspiratory flow control valve; Exhalation (PEEP) Control

2 Theory of Operation
M1207026 2-25
2.8.1 Drive gas Drive gas (O
2
) enters the Vent Engine at a pressure of 241 to 690
kPa (35 to 100 psi) through a 2-micron filter (2) that is located under
the gas inlet fitting.
2.8.2 Pressure
Regulator
The pressure regulator (1) is a non-relieving pressure regulator that
regulates high pressure filtered supply gas down to 172 kPa (25 psi).
2.8.3 Inspiratory flow
control valve
The inspiratory flow control valve (3) is cycled by the control sample
board to supply drive gas to the outer chamber of the bellows
assembly at a rate determined by ventilator settings and sensor
signals. The control valve modulates the incoming 172 kPa (25 psi)
drive gases to an output from 0 to 70 liters per minute at pressures
ranging from 0 to 100 cm H
2
O.
2.8.4 Exhalation
(PEEP) Control
The exhalation valve contains an elastomeric diaphragm that is used
to control the pressures in the breathing circuit. The exhalation valve
includes one male port on the bottom for:
• Exhalation valve pilot (A) - (manifold pressure)
The exhalation valve includes two ports on top that connect to the
bellows base manifold:
• Bellows drive gas (B)
• APL exhaust flow to scavenging (C)
A port at the back of the exhalation valve connects to the down tube
that directs all the exhaust flows to the scavenging receiver.
The exhalation valve is normally open. When the exhalation port is
open, gas flows from the bellows housing to the scavenging port.
Approximately 2 cm H
2
O of pilot pressure is necessary to close the
valve. Pilot control of the exhalation valve is done with PEEP Control
Valve (7), Supply Pressure Switch (9), and the PEEP Safety Valve
(8).
C
B
A
M1207027 004 MANUAL−DOC, Technical Reference Manual, Technical Reference Manual for 9100c, English−default
Reproduced from the electronic master in MATRIX