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EN
16
Examine the inhalation valve flap for tears and
splits.
Replace inhalation valve flap if required
17
Refit inhalation valve flap to inhalation disc.
18
Refit inhalation disc assemble to the Demand
Valve body. Note the pin should slide easily
inside the hole in the Demand Valve body
19
Refit patient port assemble to the Demand
Valve body.
Screw on hand tight only.
8.3.2. LEAK TESTING
Step
Procedure
Comment/Action
1
Connect the demand valve to gas supply
Gas will briefly flow as the Demand Valve is
connected to the gas supply, this is normal.
2
Using a suitable leak detection fluid check
for leaks at:
The leak detection fluid should be compatible
with oxygen and suitable for use on plastic
components.
3
The joint between the hose and hose fittings
at each end of the hose.
If a leak is found return the Demand Valve to
an approved repairer for hose replacement.
4
The swivel joint between the Demand Valve
body and the hose fitting.
If a leak is found return the Demand Valve to
an approved repairer for repair.
5
The connection between the hose probe
and the gas supply point.
If a leak is found here it may be due to a
worn male hose probe or a fault in the gas
supply connection. To eliminate gas supply
connection try a different supply point. If
leak continues hose assembly will require
replacement. Return the Demand Valve
to an approved repairer if the hose needs
replacing.
6
Unscrew the patient port assembly from
the Demand Valve body and lift out the
inhalation disc assembly.
7
While the Demand Valve is connected to
the gas supply hold the Demand Valve body
close to your ear (with outlet holes towards
your ear) and listen for leaks. No leaks
should be heard.
If a leak can be heard it indicates a fault with
either the main valve or pilot valve. Return
the Demand Valve to an approved repairer
for repair.
8
Refit the inhalation disc assemble to the
Demand Valve body.
9
Refit patient port assemble to the Demand
Valve body.
Screw on hand tight only.
8.3.3. DEMAND VALVE OPERATION TESTING
Step
Procedure
Comment/Action
1
Connect hose to gas supply.
Test gas may be air, nitrogen, oxygen or
N
2
O/O
2
mixture.Gas will briefly flow as the
Demand Valve is connected to the gas
supply, this is normal.
2
Press the test button. Gas should flow when
the button is pressed and stop flowing when
the button is released.
If gas flows when the button is not pressed
the Demand Valve is faulty and should be
returned to an approved repairer for repair.
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