EB 8312-2 EN
21
Mounting and start-up
7. Slide the ring nut (A8) over the actuator
stem (A7) and fasten it on the actuator.
Observe tightening torques.
8. Adjust the rated travel of the actuator
over the stem connector nut (G70).
The rated travel corresponds to the dis-
tance from the bottom of the actuator
stem to the tip of the stem connector nut.
9. Use a suitable tool to lock the stem con-
nector nut (G70) at the lock nut (G42) on
the actuator side.
10.
In the "actuator stem extends" version:
vent the actuator to extend the actuator
stem (A7) completely. It must touch the
stem connector nut (G70).
In the "actuator stem retracts" version:
apply a signal pressure to the actuator to
extend the actuator stem (A7) complete-
ly. It must touch the stem connector
(G70).
11. Connect the threaded rod and actuator
stem (A7) using the stem connector
clamps (A26/27). Tighten the hex screws
(A29). Observe tightening torques.
5.3 Quick check
SAMSON control valves are delivered ready
for use. To test the valve's ability to function,
e.g. after mounting the side-mounted hand-
wheel, the following quick checks can be
performed:
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.
Handwheel
Î
Shut off the signal pressure line.
Î
Unlock the handwheel (see section 6.2).
Î
Turn the handwheel to open and close
the valve.
Fail-safe position
Î
Shut off the signal pressure line.
Î
Check whether the valve moves to the
fail-safe position.
