EB 8048-2/-3 EN
31
Mounting and start-up
5.4
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
Type 3349-1 and Type 3349-7:
check
the travel reading at the travel indicator
scale.
Fail-safe position
Î
Shut off the signal pressure line.
Î
Check whether the valve moves to the
fail-safe position.
Pressure test
During the pressure test, make sure the fol-
lowing conditions are met:
−
Retract the plug stem to open the valve.
−
Observe the maximum permissible pres-
sure for valve and plant.
The plant operator is responsible for per-
forming the pressure test. SAMSON's Af
-
ter‑sales Service department can support you
to plan and perform a pressure test for your
plant.
NOTICE
!
Note
