8-40
Ensure no leakage occurs before using the negative pressure ball. Check whether the pre-seal
cover is fastened. Then, squeeze the negative pressure ball to exhaust all gas inside. Properly
install the exhaust port plug. Block the pre-inlet port using your fingers and then release the
negative pressure ball. Ensure that the negative pressure ball is obviously expanded within 30s. If
not, replace the negative pressure ball.
8.4.2 Effectiveness Test for the Pipeline Pressure Gauge and
Correction of the Regulator
The following table lists the faults related to gas source and drive gas.
Failure Description Possible Cause Recommended Action
Leakage
The supply pipeline is
damaged or the seal ring
of the connector is
damaged.
Replace the supply pipeline or seal ring of the
connector.
The quick connector is
leaked.
Replace the quick connector or PU tube. (If
the PU tube is not damaged and has enough
length, cut a certain segment of the PU tube
that is in contact with the quick connector and
insert the segment into the PU tube.)
The pipeline inlet
assembly is leaked.
Check whether the check valve of the
pipeline gas source assembly has a leakage
issue in the reverse direction. If necessary,
replace the check valve. Check whether the
seal ring on the pipeline inlet assembly is
damaged. If yes, replace the seal ring. If the
issue persists, replace the pipeline inlet
assembly.
The drive gas pipeline is
leaked.
Check and repair the exhalation valve
according to section 5.3.4.2 Low Pressure
Airway System Leakage Test.
The pipeline
pressure gauge
displays inaccurate
reading or no
reading.
The pipeline pressure
gauge is damaged.
Replace the pipeline pressure gauge.
The reading of the
pipeline pressure
gauge is sharply
fluctuated.
The filter of the pipeline
supply assembly or PU
tube of the pipeline
pressure gauge is
blocked, or the pressure
If the pipeline pressure is stable, check the
PU tube of the pipeline pressure gauge or the
filter of the pipeline supply assembly. If the
PU tube or filter is blocked, replace it.
2. If the issue persists, replace the pipeline
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