Samson 3277-5 - Conversion Work; Reversing the Direction of Action (Fail-Safe Action)

EB 8310-1 EN 9-7
Servicing and conversion
Radial shaft seal
Wiper ring
Seal lip
Fig.9-2: Aligning the radial shaft and seal
wiper ring
9.5 Conversion work
SeeFig.9-1
9.5.1 Reversing the direction
of action (fail-safe
action)
The direction of action (and fail-safe action)
of pneumatic actuators can be changed. The
fail-safe action is indicated on the nameplate
by a symbol:
Actuator stem extends
Actuator stem retracts
a) Reversal of the direction of
action from stem extends to
stem retracts
1. Lift off the top diaphragm case (A1) and
remove springs (A10).
2. Pull the actuator stem (A7) together with
the diaphragm plate (A5.1), diaphragm
(A4) and diaphragm plate (A5.2) out of
the bottom diaphragm case (A2).
3. Unscrew the collar nut (A15).
Malfunction due to loosened nut.
The nut (A9) on the actuator stem serves to
adjust the dimension a.
Î Do not undo the nut (A9).
Î If the nut has been loosened, readjust the
dimensiona as specied in Table 9-1.
4. Remove the diaphragm plate (A51), dia-
phragm (A4) and diaphragm plate
(A5.2) from the actuator stem (A7) and
place them back on again in the reverse
order.
5. Tighten the collar nut (A15).
6. Apply a suitable lubricant to the actuator
stem (A7).
7. Place the springs (A10) in the bottom di-
aphragm case (A2), centering them in
the intended recesses.
8. Place the actuator stem (A7) together
with the diaphragm plate (A5.1), dia-
phragm (A4) and diaphragm plate
(A5.2) in the bottom diaphragm case
(A2).
9. Place on the top diaphragm case (A1).
10. Fasten the top and bottom diaphragm
cases (A1, A2) together using the nuts
(A21) and bolts (A20). Observe tighten-
ing torques.
11. Type3271-5: connect the signal pres-
sure as described in 'Pneumatic connec-
tion' in the 'Installation' section. Unscrew
NOTICE
!