Mechanical Overpressure Valve; Reservoir And Bleed Resistor - GE Datex-Ohmeda Aisys Carestation Reference Manual

Aisys
2.13.7 Mechanical
Overpressure Valve
2.13.8 Reservoir
and bleed resistor
2-64
The Mechanical Overpressure Valve (MOPV) is a mechanical valve (14) that operates
regardless of electrical power. It functions as a third level of redundancy to the
ventilator's pressure limit control functions, supplying pressure relief at approximately
110 cm H O.
2
Figure 2-53 • Mechanical overpressure valve
The reservoir (15) is a 200 ml chamber that dampens the manifold (pilot) pressure
pulses to the exhalation valve.
The bleed resistor (16) is a "controlled leak" from 0 to 12 l/min in response to circuit
pressures from 0 to 100 cm H
through the bleed resistor permits control of the exhalation valve's pilot pressure by
modulation of the valve output. The bleed resistor exhausts only clean drive gas and
must not be connected to a waste gas scavenging circuit. The output is routed away
from the electrical components to make sure that systems using oxygen drive gas meet
the 10VA limitation requirement for oxygen enrichment.
16
Figure 2-54 • Reservoir and bleed resistor
14
O. The small quantity of pneumatic flow exhausting
2
thing
lve
Overpressure
m H2O)
ve Gas Check Valve
5 cm H2O bias)
15
tory Flow
rol Valve
Gas Inlet
Valve
Vent Engine
Atmosphere
Free Breathing
Check Valve
Popoff
Mechanical Overpressure
Valve
Valve (110 cm H2O)
Exhalation Va
Drive Gas Check Valve
(2.0 cm H2O
(3.5 cm H2O bias)
Inspiratory Flow
Control Valve
200 m
25 psig @
15 LPM
Gas Inlet
Valve
Contro
1.0
if conti
Popoff
Bag/Ve
Valve
(10 cm H2O)
Exhalation Valve
(2.0 cm H2O bias)
0-10 LPM Drive Gas
0-10 LPM Patient and Fresh Gas
0-20 LPM Total Typical Flow
Negative Pressu
relief valve
200 mL Reservoir
25 psig @
15 LPM
Control Bleed to Ambient
1.0 LPM @ 3.0 cm H2O
if continuous (rate dependent)
Vent to Ambient
5 4 ig
04/08 M1046983