Samson 3278, Translation Of Original Instructions

Page: 25 / 48

EB 8321 EN 5-3
Installation
b) Fail-open valve
1. Loosen stop bolts (42.1 and 42.2).
2. Apply a signal pressure to the signal
pressure connection (11) which corre-
sponds to the upper bench range value
(see nameplate).
3. Adjust the stop bolt for closed position
(42.1) at the point where the butterfly
valve is completely closed.
4. Apply a signal pressure to the signal
pressure connection (11) which corre-
sponds to the lower bench range value.
Turn the other stop bolt (42.2) until the
butterfly valve stops at an opening angle
of 70°.
Read the angle off the angle indication
scale on the butterfly valve or from the
positioner display.
5. Lock the position of both stop bolts with
the lock nuts.
6. Write down the adjusted opening angle
on the actuator's nameplate.