Operation; Start-Up; Set Point Adjustment; 3.2.1 Set Point For Flow Rate - Samson 42-37 Mounting And Operating Instructions

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Operation

3.1

Start-up

CAUTION!
First start up the regulator after mounting all
the components, e.g valve, actuator and con-
trol lines.
Make sure the control lines are open and cor-
rectly connected before start-up.
Note: On filling the plant, make sure the re-
striction (1.1) is open by turning the adjust-
ment screw counterclockwise as far as it will
go.
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Open all the valves on the consumer
side. Slowly open the shut-off valves
starting on the return flow pipe first. In
case of valves balanced by a bellows in
DN 125 or larger, vent the bellows hous-
ing (8) at the stopper located at the side
of the bellows housing.
If needle valves are installed in the control
lines, open them before start-up. Fill equaliz-
ing tanks with the process medium before
start-up.
Rinsing the plant · After filling the plant, first
completely open the consumers. If this is not
possible open the bypass. Open the restric-
tion for flow rate adjustment with a differen-
tial pressure set point spring at maximum
compression. Rinse out the pipeline at full
flow rate for several minutes. Check the in-
stalled strainer (e.g. by measuring the pres-
sure drop) afterwards. Clean the strainer, if
necessary.
NOTICE
The pressure at the actuator must not exceed
the nominal pressure by 1.5 times on testing
the pressure of the plant when the regulator is
already installed
The control lines must route the test pressure
to the actuator at the same time to prevent the
actuator diaphragms from being damaged.
When Type 42-39 is used as a flow and pres-
sure regulator, do not connect the control line
to diaphragm chamber C.
3.2

Set point adjustment

3.2.1 Set point for flow rate

Note: Before adjusting the flow rate, you first
need to adjust the set point for the differential
pressure (or pressure) to its maximum value,
To do this, turn the nut (17) clockwise to load
the set point spring (16).
The control valves and shut-off valves as well
as all consumers or a bypass valve, if appli-
cable, must be opened to reach the maximum
flow rate, but without the high differential
pressure (pressure) being able to close the
valve.
Turn the restriction (1.1) until the required
flow rate is reached, by reading, for exam-
ple, the flow rate reading off a heat meter (see
Table 1 · Flow rate set point ranges).
Note: Always start the adjustment from a
closed restriction!
Operation
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EB 3017 EN