Samson 3525, Mounting And Operating Instructions

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EB 8823 EN 29
Mounting and start-up
Risk of valve damage due to a sudden pres-
sure increase and resulting high flow veloci -
ties.
Slowly resume medium flow during start-up.
8. Check the valve to ensure it functions
properly.
Version with threaded ends
1. Proceed as described for Version with
flanges (steps 1 to 3).
2. Screw the valve onto the pipeline. Install
an appropriate sealing. Make sure that
the valve is free of stress.
T-pattern: Screw the screw plug into the
desired outlet. The screw plug, too, needs
to be installed with an appropriate seal
-
ing.
3. Proceed as described for Version with
flanges (steps 6 to 8).
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 resume medium flow in the pipe-
line.
Risk of valve damage due to a sudden pres-
sure increase and resulting high flow veloci -
ties.
Slowly resume medium flow during start-up.
3. Check the valve for leakage to the atmo-
sphere (visual inspection).
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.
Pressure testing
When pressure testing make sure that the fol-
lowing conditions are met:
− Retract the plug to open the valve.
− Observe the maximum permissible pres -
sure for both the valve and plant.
The plant operator is responsible for pressure
testing. SAMSON’s After-sales Service de -
partment can support you in planning and
implementing the pressure test for your plant.
NOTICE !
NOTICE !
Note