Samson 3222/2780 series, Монтаж и эксплуатация

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32 EB 5866 EN
Malfunctions
8.2 Emergency action
The valve, on which the electric actuator with
fail-safe action is mounted, is moved to its
fail-safe position upon power supply failure
(voltage supply, signal pressure). See sec-
tion 3.1.
Operators are responsible for emergency ac-
tion to be taken in the plant.
In the event of a valve malfunction:
1. Close the shut-off valves upstream and
downstream of the control valve to stop
the process medium from flowing
through the valve.
2. Check the valve for damage. If neces-
sary, contact SAMSON's After-sales Ser-
vice department.
Putting the valve back into operation after
a malfunction
Î
Slowly open the shut-off valves. Allow
the process medium to flow into the valve
slowly.