When tapping the pressure at a straight pipe-
line section, observe a minimum distance of
at least twice the nominal valve size to the
regulator.
Connect the control lines to the side or top of
the main horizontal pipeline. If possible, in-
stall the tapping connection in a pipe expan-
sion.
Install other fittings that may cause flow turbu-
lence (e.g. shut-off valves, restrictions, bows,
bends or branches) at an appropriate dis-
tance to the control line connection (at least
three times the nominal valve size).
Note!
If the gas to be controlled contains
moisture, condensate may form in the control
line, which can damage the regulator. To al-
low the gas to flow back into the tank or pipe-
line, install the control line with a downward
slope of approx. 10 % towards the pressure
tapping point.
3
Operation
3.1
Start-up
See also
Fig. 2
, page
5
.
NOTICE
Do not start up the regulator before all com-
ponents have been installed.
Make sure the control line is free of dirt or
other contaminations that may impair the
proper medium flow.
Connect the line properly.
We recommend to open shut-off valves
slowly
from the downstream side. Avoid
pressure surges.
NOTICE
The max. permissible pressure at the operat-
ing diaphragm must not exceed
0.5 bar
with
A = 1200 cm²,
1 bar
with A = 640 cm²,
2 bar
with A = 320 cm² and
4 bar
with A =
160 cm².
Make sure this pressure is not exceeded, par-
ticularly when pressure-testing the plant with
the regulator installed or when starting up the
plant.
3.2
Adjusting the set point
Adjust the desired set point by tensioning the
set point springs using the set point adjuster
(SW 27/¾" adjustment screw).
4
Remove the cap (10).
4
Turn the adjustment screw using a socket
wrench with width across flats SW 27.
4
Turn the adjuster clockwise
P
to increase
the set point and counterclockwise
Q
to
reduce it.
4
Remount the cap.
EB 2528 EN
7
Operation
Fig. 4 · Set point adjustment; view from top
Adjustment screw
SW 27
(¾")
