Shut-Off Valves, Gauges; Operation; Start-Up; Set Point Adjustment - Samson 45-6 Mounting And Operating Instructions

Operation

2.3

Shut-off valves, gauges

We recommend the installation of hand-op-
erated shut-off valves both upstream of the
strainer and downstream of the regulator.
This allows the plant to be shut down for
cleaning and maintenance routines or when
it is not operated for extended periods. In-
stall pressure gauges upstream and down-
stream of the valve to monitor the pressures
prevailing in the plant.
3 Operation
3.1

Start-up

Fill the plant very slowly on start-up. When
pressure-testing the pipelines with the regu-
lator installed, make sure the test pressure
does not exceed 1.5 times the nominal pres-
sure.
3.2

Set point adjustment

The required differential pressure is adjusted
at the set point adjuster (10) or the manual
adjuster (12) by loading the spring(s).
Δp
1.2
1.0
0.8
0.6
0.4
0.2
0
1
2 3
Fig. 3 · Set point adjustment according to scale
6
EB 3226 EN
4 6
5
Division of scale
4
Turn the adjuster clockwise to increase
the differential pressure.
4
Turn the adjuster counterclockwise to
reduce the differential pressure.
In the case of regulators with set point
ranges from 0.1 to 1 bar in sizes DN 15 to
32, the positioning springs are located in
the actuator housing,
The set point can be adjusted directly at the
manual adjuster (12) on the basis of the
scale value (see Fig. 5).
One turn of the manual adjuster will change
the differential pressure by 0.033 bar.
Set point adjustment
using the
manual adjuster
Fig. 4 · Manual adjuster (0.1 to 1 bar / DN 15 to 32)
Note!
Do not adjust the set point to a scale value
smaller than "1"!
Under certain conditions, the set point can-
not be adjusted anymore as a result.
In this case, the following steps are recom-
mended:
– Relieve the process pressure from both
sides of the regulator.
– Turn the manual adjuster counterclockwise
as far as it will go to its lowest position.
– Turn the manual adjuster back clockwise
at least past the scale value "1" to "2".
– The regulator can now be readjusted.
12