Samson 3271, Original Instructions Manual, Page: 53 / 72

EB 8310-6 EN 9-11
Service and conversion work
13. Fasten the top and bottom diaphragm
cases (A1, A2) together using the nuts
(A21) and bolts (A20). Observe tighten-
ing torques.
14. Unscrew the vent plug (A16) from the top
signal pressure connection and screw it
into the bottom connection (S).
The actuator springs, which now push
against the diaphragm plate from below,
cause the actuator stem to retract. The
signal pressure is connected to the top
connection (S) on the top diaphragm
case. As a result, the actuator stem ex-
tends opposing the spring force as the
signal pressure increases.
15. Affix a new nameplate with changed
symbol and new configuration ID to the
actuator.
b) Reversal of the direction of
action from stem retracts to
stem extends
1. Lift off the top diaphragm case (A1).
2. Pull the diaphragm plate assembly con-
sisting of the diaphragm plate (A5), dia-
phragm (A4) and actuator stem (A7) out
of the actuator.
3. Take the springs (A10) out of the bottom
diaphragm case (A2).
4. Unscrew and remove the collar nut
(A15), while holding the nut (A9) station-
ary.
Malfunction due to loosened nut (A9).
The nut (A9) on the actuator stem serves to
adjust the dimension x.
Î
Do not undo the nut (A9).
Î
If the nut (A9) has been loosened, read-
just the dimension x as specified in Table
9-1.
5. Clamp the bottom section of the actuator
stem (A7) into a vise using protective
jaws. Make sure that the actuator stem is
not damaged.
6. Remove the diaphragm plate (A5) with
diaphragm (A4) from the actuator stem
and place them back on in reverse order.
7. Tighten the collar nut (A15), while hold-
ing the nut (A9) stationary. Observe
tightening torques.
8. Apply a suitable lubricant to the actuator
stem (A7).
9. Place the diaphragm plate assembly to-
gether with the actuator stem (A7) point-
ing downward into the bottom dia-
phragm case (A2). Make sure that the
sealing elements are not damaged.
10. Place the springs (A10) into the bottom
diaphragm case, centering them in the
intended recesses.
11. Place on the top diaphragm case (A1).
12. If necessary, preload the springs (see the
'Start-up' section).
13. Fasten the top and bottom diaphragm
cases (A1, A2) together using the nuts
X
A4
A6
A19
A15 A5
A9
A7
A6
A19
A4 A15 A5
A9
A7
X
A4 Diaphragm
A5 Diaphragm plate
A6 Hose clamp
A7 Actuator stem
A9 Hex nut
A15 Collar nut
A19 Compressor
Fig. 9-5: Arrangement of parts for "stem retracts" direction of action (left) and "stem extends"
direction of action (right)
Table 9-1: Values for dimension x (see Fig. 9-5)
Type Actuator area Travel in mm
Dimension x in mm
(top of the nut to the bottom of the actuator stem)
3271
240 15 98.25
350 15 107.25
700 30 144
3277
240 15 –
350 15 209
700 30 246
NOTICE !