Bottom Travel Stop (Minimum Travel); Top Travel Stop (Maximum Travel); Version With Handwheel; Operating The Handwheel Of Version With "Stem Extends" Direction Of Action - Samson 3372 Mounting And Operating Instructions

6.2.1 Bottom travel stop
(minimum travel)
1. Loosen lock nut (A101) and remove cov-
er (A100).
2. Loosen the lock nuts (A104).
3. Move actuator to the position of mini-
mum travel.
4. Screw the bottom nut (A104) on as far
as it will go and lock this position with
the top nut (A104).
Note
If the minimum travel is not to be limited,
thread the nuts (A104) until they reach the
end of the spindle (A98) and lock them in
position.
5. Attach the cover (A100) and retighten
the lock nut (A101).
6.2.2 Top travel stop
(maximum travel)
1. Loosen the lock nut (A101).
2. Unscrew the cover (A100).
3. Move actuator to the position of maxi-
mum travel.
4. Screw back on the cover (A100) as far it
will go and retighten the lock nut (A101).
EB 8313-3 EN

6.3 Version with handwheel

Note
Contact our after-sales service to retrofit an
actuator with a handwheel.
The Type 3372 Electropneumatic Actuator
(120 cm²) can optionally fitted with a hand-
wheel. The actuator stem can be moved over
a spindle. The actuator travel is adjusted
against the spring force (see Fig. 6-3).
The pin (A65) moves up or down in the ob-
long hole of the sleeve (A66) depending on
which way the handwheel is turned. This
causes the spindle (A62) to either extend or
retract.
To change from manual to automatic opera-
tion, put the handwheel into the neutral posi-
tion by turning the handwheel to align the
dot with the horizontal marking at the front.
6.3.1 Operating the hand-
wheel of version with
"stem extends" direction
of action
1. Turn the handwheel counterclockwise.
The actuator stem retracts causing a
globe valve to open.
2. Retract the actuator stem up to the re-
quired position.
Start-up
6-5