10
Maintenance
The maintenance operations required for the
pressure regulator (and the safety shutoff valve)
are closely linked to the quality of gas supplied (in
terms of moisture content, liquid hydrocarbons
and impurities in general) and to the degree of fil-
tration performed upstream of the pressure regu-
lator. For this reason we recommend always in-
stalling a
cartridge filter
upstream from the pres-
sure regulator that is capable of withholding the
solid and liquid particles present in the gas that
might otherwise compromise efficient operation.
All pressure must be discharged before perform-
ing any maintenance operation on the pressure
regulator by proceeding as follows:
•
Close the on/off valves upstream and down-
stram,
•
Slowly discharge the pressure by opening the
vent valve downstream from the pressure
regulator until the gauge indicates zero.
Before performing any maintenance operation on
pressure regulators fitted with
overpressure and
underpressure
shutoff devices, open the bypass
between the inlet and outlet chambers (see In-
struction Manuals for safety shutoff valve). This re-
lieves the pressure that otherwise would be
trapped upstream from the valve disc of the safe-
ty shutoff device.
Disassembly
Check the following before beginning any disas-
sembly operations on the pressure regulator:
•
The regulator must be depressurized as
described above;
•
The wrenches and other tools required for the
operation must be close at hand;
•
Spare parts to replace damaged parts must be
immediately available.
Remember to:
•
Disassemble all parts carefully in order to avoid
damage. Pay extra attention to the rubber parts
(using the appropriate tool for the disassembly
of the O-rings) and replace all parts that exhibit
even the slightest signs of damage.
Built-in safety valve
Thanks to its modular design, the retrofit - or
change of safety valve model - can be easily
made on the field without dismounting the regu-
lator from the gas line.
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