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OMV
Service Instruction
created by the participants of the
CCBRT Anaesthesia Maintenance Training Course 2008 |
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Step 1
Remove pointer.
(1 screw)
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Step 2
Remove label and scale.
(2 screws)
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Step 3
Remove cover.
(3 screws)
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Step 4
Mark position of inlet or outlet cone.
Also mark the position of the rack.
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Step 5
Remove the rack.
(2 brass screws)
Important: Open the 2 counter nuts and
screws from the sides first. Otherwise you will demage the 2 brass screws.
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Step 6
Remove inlet cone.
(4 screws)
Remove regulator assembly.
(2 gaskets)
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Step 7
Check the regulator and the gaskets.
Clean everything with ether or alcohol.
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Step 8
Remove outlet cone.
(4 screws, 1 gasket)
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Step 9
Remove slide valve by pushing from outlet end of the housing.
If you have difficulties use a wooden or plastic tool.
Important: No metal tool! Metal will damage the valve's surface.
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Step 10
Clean the device with alcohol or ether.
Obstinate dirt can be removed with metal polish, if you wash away the polish afterwards with alcohol carefully.
Before assembling you may lubricate the valve lightly with vaseline.
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Step 11
Unscrew the regulator housing.
(4 screws)
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Step 12
Remove the regulator housing.
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Step 13
Clean the regulator with ether or alcohol.
Check every moving part for smoth motion.
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Step 14
Probably you need a new O-ring. If you don't have the original you may take another one. Put a bigger O-ring in and tighten the 4 srews of the clamp ring lighty just to keep the O-ring in position.
Cut it now accurately with a sharp knife. Work carefully, otherwise you will have leakage problems. Put a bit vaseline on the O-ring before inserting the regulator back to the housing.
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Step 15
Check the vaporizing chamber and the metal mesh for damages and clean everything.
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Step 16
Remove the lever of the halothane insert
mechanism.
(1 screw)
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Step 17
Clean the parts.
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Step 18
Only in case of a leakage continue dismanteling the rest of the mechanism.
Hold the sleeve and unscrew the inner
screw.
Important: To loose – turn clockwise
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Step 19
While assembling be sure that the lever
covers the hole of the white plastic
nozzle properly.
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Step 20
After reassembling and tighten all srews
check the pointer setting.
Move the pointer between 50 and 60
and insert the setting gauge through the
outlet.
Now move the pointer to the left. It
should indicate 35 (+/- 1mm).
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Step 21
The original setting gauge is shown in
the drawing above.
The same result you get with a modified
4mm allen key. The original diameter is
3.17 mm. But even a normal 3 mm allen key works fine.
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Step 22
Finally the leak test. Block outlet connector and connect an air source and a pressure gauge to the inlet.
(An old sphygmomanometer works very well)
Pump air into the system until approximately 200 mmHg. Close the airway. The pressure will fall slowly. The time for falling until
190 mmHg should be at least 30 seconds. Do the test with pointer in 'OFF' and in '3.5' position.
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Step 23
Leaks become visible by brushing a little soap water around the connections.
Bubbles will appear.
Note: Around the brass rack on top of the regulator only use ether or alcohol. The slider gets stick after the soap
solution is dried.
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