Regulator Start-Up; Monitor Start-Up; Pressure Regulator Setting - ITRON RB 4600 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 valve 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 under-pressure protection
is always closed in absence of gas downstream
from the regulator, where its sensing line is
connected.
•
check that the pressure rises slowly; the down
stream pressure must stabilize 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 mal-
function;
•
after the outlet pressure has stabilized, open the
on/off valve completely;
•
then slowly open the downstream on/off valve
until the piping is completely filled.
At this point, the pressure regulator is operative.

Monitor Start-up

The same procedure must be followed when
starting a monitor and active system, bearing in
mind that the pressure gauge installed in the sec-
tion 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 modi-
fied, this value must be set within the setting range
Wa 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 clockwise the adjustment screw on top of
the pilot - see Fig 1.
•
To decrease the set pressure:
proceed as above, rotating the spring adjust-
ment screw counter-clockwise.
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