Regulator Start-Up - ITRON RB 4000 Instruction Manual

Regulator Start-up

After the pressure regulator has been
installed, make sure that the on/off valve
upstream and downstream and the vent
valve are all closed.
• partially open the upstream on/off val-
ve slowly enough to pass a very small
amount of gas;
• reset the safety shutoff valve (see the
relevant Instruction Manual). Note that
a safety shutoff valve with over and un-
der-pressure protection is always clo-
sed in absence of gas downstream
from the regulator, where its sensing
line is connected.
• check that the pressure rises slowly;
the downstream pressure must stabili-
ze around the set value. If the pressure
continues to rise, interrupt the starting
procedure by closing the upstream
on/off valve and identify the cause of
the malfunction;
• after the outlet pressure has stabilized,
open the on/off valve completely;
• then slowly open the downstream
on/off valve until the piping is comple-
tely filled.
At this point, the pressure regulator is
operative.
10
14
Monitor Start-up
The same procedure must be followed
when starting a monitor and active sy-
stem, bearing in mind that the pressure
gauge installed in the section in between
the two regulators must indicate the
same pressure value as the upstream
gauge.
Pressure Regulator Setting
The pressure regulator is usually delivered
already set to the specifications indicated
in the order sheet. Whenever the set
pressure must be modified, this value
must be set within the setting range of
the spring installed.
Make sure there is a flow demand or
open the vent valve downstream of the
regulator. This valve should be closed after
the desired set pressure is obtained.
• To increase the set pressure: rotate
the adjustment screw clockwise using
the adjustment wrench - see Fig 8.
• To decrease the set pressure: proceed
as above, rotating the spring adjust-
ment screw counter-clockwise.