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9
Troubleshooting Guide
9.2
Circle System
34
Fault
No pressure is building
up in the circle system
Pressure regulating
valve not closed or not
tight
Respiratory resistance
too high (becomes
evident by delayed
buildup of pressure
resp. decrease of
pressure)
The pressure indicated
by the respiratory
pressure gauge is
higher than the
pressure set on the
pressure regulating
valve
Tab. 2: Troubleshooting Circle System
SA-103-0109V1.3-HAO-GB
Possible cause
Leakage in the circle
system
Valve disc sticks in the
valve box
Pressure regulating
valve is incorrectly
calibrated
Pressure gauge is
incorrectly calibrated
Elimination of fault
Tightness test of the
circle system
Close pressure
regulating valve
Clean flap valves
See functional
capability of the
pressure regulating
valve
Calibrate the
respiratory pressure
gauge
© F. Stephan GmbH
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