Samson 3321 - Installing the Control Valve; Quick Check

EB 8111/8112 EN 31
Mounting and start-up
Noise emission
Trims with ow dividers can be used to re-
duce noise emission (see uT8081).
5.2.3 Installing the control
valve
1. Close the shut-off valve in the pipeline
while the valve is being installed.
2. Remove the protective caps from the
valve ports before installing the valve.
3. Lift the valve using suitable lifting equip-
ment to the site of installation (see sec-
tion4.2.2). Observe the ow direction
through the valve. The arrow on the
valve indicates the direction of ow.
4. Make sure that the correct ange gaskets
are used.
5. Bolt the pipe to the valve free of stress.
6. Depending on the eld of application,
allow the valve to cool down or heat up
to reach ambient temperature before
start up.
7. Slowly open the shut-off valve in the
pipeline after the valve has been in-
stalled.
Risk of valve damage due to a sudden pres-
sure increase and resulting high ow veloci-
ties.
Slowly open the shut-off valve in the pipeline
during start-up.
8. Check the valve to ensure it functions
properly.
5.3 Quick check
SAMSON valves are delivered ready for
use. To test the valve's ability to function, the
following quick checks can be performed:
Tight shut-off
1. Close the valve.
2. Slowly open the shut-off valve in the
pipeline.
Risk of valve damage due to a sudden
pressure increase and resulting high ow
velocities.
Slowly open the shut-off valve in the pipeline
during start-up.
3. Check the valve for leakage (visual in-
spection).
Travel motion
The movement of the actuator stem must be
linear and smooth.
Î Open and close the valve, observing the
movement of the actuator stem.
Î Apply the maximum and minimum con-
trol signals to check the end positions of
the valve.
Î Check the travel reading at the travel in-
dicator scale.
Fail-safe position
Î Shut off the signal pressure line.
Î Check whether the valve moves to the
fail-safe position.
NOTICE
!
NOTICE
!