Samson 3259, Translation Of Original Instructions

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30 EB 8059 EN
Mounting and 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 pres -
sure increase and resulting high flow veloci -
ties.
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.
Adjustable packing
A label on the yoke (3) indicates whether an
adjustable packing is installed.
1. Tighten the threaded bushing gradually
(by turning it clockwise) until the packing
seals the valve.
Risk of valve damage due to the threaded
bushing tightened too far.
Make sure that the plug stem can still move
smoothly after the threaded bushing has
been tightened.
2. Open and close the valve several times.
3. Check the valve for leakage (visual in-
spection).
4. Repeat steps 1 and 2 until the packing
completely seals the valve.
If the adjustable packing does not seal prop -
erly, contact SAMSON's After‑sales Service
department.
Pressure test
During the pressure test, make sure the fol-
lowing conditions are met:
− Retract the plug stem to open the valve.
NOTICE
!
Tip
NOTICE
!
Note