Maintenance - ITRON RB 4000 Instruction Manual

Maintenance

The maintenance operations required for
the pressure regulator (and the safety shu-
toff valve) are closely linked to the quality of
gas supplied (in terms of moisture content,
liquid hydrocarbons and impurities in ge-
neral) and to the degree of filtration per-
formed upstream of the pressure regulator.
For this reason we recommend always in-
stalling a cartridge filter upstream from the
pressure regulator that is capable of with-
holding the solid and liquid particles pre-
sent in the gas that might otherwise com-
promise efficient operation.
All pressure must be discharged before
performing any maintenance operation on
the pressure regulator by proceeding as
follows:
• Close the on/off valves upstream and
downstream,
• Slowly discharge the pressure by ope-
ning the vent valve downstream from
the pressure regulator until the gauge
indicates zero.
Before performing any maintenance ope-
ration on pressure regulators fitted with
overpressure and under pressure shutoff
devices, open the bypass between the in-
let and outlet chambers (see Instruction
Manuals for safety shutoff valve). This relie-
ves the pressure that otherwise would be
trapped upstream from the valve disc of
the safety shutoff device.
Disassembly
Check the following before beginning any
disassembly operations on the pressure re-
gulator:
• 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 the actuator top casing
only after removing the loading spring;
• 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 dismoun-
ting the regulator from the gas line. See
Fig 9.
Noise abatement cage (silencer)
This part can be easily accessed from the
bottom cap. See Fig 7
11
15