Samson 3251, Mounting And Operating Instructions

Page: 35 / 60

EB 8052 EN 35
Mounting and start-up
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 flange (2) 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.
−
Observe the maximum permissible pres-
sure for valve and plant.
The plant operator is responsible for
performing the pressure test. SAMSON's
After‑sales Service department can support
you to plan and perform a pressure test for
your plant.
Tip
NOTICE
!
Note
Note