IM-P337- 6 9 EMM Issue 2
56
8.1.1.2 Visual checks of ILVA20
It is also possible to carry out some simple checks on the ILVA20, though to do so the ILVA20 would need
to be removed from the line.
Checks possible:
1. With the ILVA20 held in a vice (with soft jaws) with the cone and shaft below, check that the cone is
free to move up and down on the shaft. It should have a smooth action with no ‘sticking’ points across
the full movement.
2. Check that the spring is not cracked or broken. DO NOT loosen the nuts at either end of the shaft or
dismantle the ILVA20, or the calibration will be affected.
3. Check that the differential pressure ports are clear and free of debris. Clean if necessary with an airline
or appropriate tool.
Spring
Cone
Fig. 31
Do not loosen
Do not loosen
Upstream pressure
port
Downstream
pressure port
Shaft
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