Operation; Starting Up The Plant; Adjusting The Set Point - Samson 45-9 Mounting And Operating Instructions

6.2 Operation

The regulator is ready for use when mount-
ing and start-up have been completed.
WARNING
!
Risk of burn injuries due to hot or very cold
components and pipelines.
Depending on the process medium, valve
components and pipelines may get very hot
or cold and cause burn injuries.
Wear protective clothing and safety gloves.

6.3 Starting up the plant

Î See Fig. 4 and Fig. 3
Î Start up the regulator after mounting all
parts.
Î Fill the plant slowly with the process me-
dium. Avoid pressure surges.
Î First open the shut-off valves slowly start-
ing from the downstream side. After-
wards open the shut-off valves on the up-
stream pressure side.
Î Make sure that the pressure rises simulta-
neously upstream and downstream of the
regulator to avoid damaging the plug
balancing mechanism.
EB 3128 EN

6.4 Adjusting the set point

Î See Fig. 4 and Fig. 3
NOTICE
!
Set point adjustment is always based on a
closed restriction (1.2).
How to proceed:
1. To achieve the maximum flow rate, all
control and shut-off valves as well as all
consumers including the motorized valve
must be open (to ensure minimum drag
in the plant).
2. Close the bypass valve, if installed.
3. Unscrew the cap (8.6).
4. Undo the lock nut (8.2) and adjust the set
point screw (8.3).
Turning it clockwise () closes the restric-
tion; the flow rate drops.
Turning it counterclockwise () opens the
restriction; the flow rate rises.
The adjustment diagrams (Fig. 8 or Fig. 9)
can be used as a guide to adjust the flow
rate. The required number of turns of the set
point screw (8.3) is based on a closed re-
striction (8.5).
Refer to the nameplate on the regulator or to
Table 5 to find out the adjustable set point
range of the relevant nominal size.
All flow rate curves refer to a differential
pressure across the restriction of 0.2 bar, ex-
cept for the dotted curve which refers to a
differential pressure of 0.3 bar.
Start-up and operation
25