48 Functional checks
7.4 Check of patient valve
Checking reusable hose system
1. Dismantle the patient valve.
2. Carry out a visual check of all the components
for cracks or other physical damage.
Crinkled, sticky or misshapen lip membranes
must be changed immediately. They must never
be used during ventilation as they can cause
serious functional disturbances.
Also perform a visual check of the valve mem-
branes in the expiration and spontaneous
breathing arms. To do so, there is no need to
dismantle the valve membranes. Crinkled, mis-
shapen or sticky valve membranes must be re-
placed, however, as they can lead to consider-
able malfunctions.
3. Reassemble the patient valve.
When reassembling, make sure that the lip
membrane is correctly positioned.
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