PIETRO FIORENTINI NORVAL, Installation, Commisioning And Maintenance Instructions

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TECHNICAL MANUAL MT044
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6.0 TROUBLE-SHOOTING
The problems of various kinds which could arise over time are highlighted below.
They derive from phenomena associated with the conditions of the gas as well, of course, as with the natural
ageing and wear of the materials.
It must be remembered that all operations on the apparatuses must be carried out by highly qualified personnel
with appropriate knowledge of the subject. Tampering with the apparatuses by unsuitable personnel relieves us
from all responsibility of any kind.
You must therefore train your maintenance personnel or avail yourself of the service centres officially authorised
by us.
6.1 TAB. 9 REGULATOR (FIG. 17)
Dirt Clean the parts subject to movement
Anti-pumping valve not suitable for the Adjust or replace the internal part
particular type of installation
Compensating diaphragm [29] worn Replace
Incorrect assembly of diaphragm [20] Check
Operating anomalies
Setting spring [41] Check and, if necessary, replace
Incorrect assembly of compensating Check
diaphragm [29]
Reinforced gasket [4] with wrong Replace
hardness
Incorrect sensing line take-off Change arrangement
arrangement
Reinforced gasket [4] damaged Replace
No tightness at Q=0
Valve seat dented Grind or replace
PROBLEM POSSIBLE CAUSES REMEDY