Samson 3277 Mounting And Operating Instructions page 29

12. Clamp the top diaphragm case (A1) with
the opening facing upward into a suit-
able clamping fixture.
13. Place the diaphragm plate assembly con-
sisting of the actuator stem (A7), dia-
phragm plate (A5), and diaphragm (A4)
with the actuator stem pointing upward
into the diaphragm case (A1).
14. Place the springs (A10) in the diaphragm
plate (A5), centering them in the intend-
ed recesses.
15. Carefully guide the bottom diaphragm
case (A2) over the actuator stem (A7)
and place it on the springs (A10). Make
sure that the sealing elements are not
damaged. Ensure that the compressed
air connections on the cases (A1, A2)
are correctly aligned with each other.
16. If necessary, preload the springs (see
section 5.2).
A33
A36
A17
A35
A7
A4 Diaphragm
A5 Diaphragm plate
A7 Actuator stem
Fig. 8: Arrangement of parts for "stem extends" direction of action (left: 175 cm²; right: 750 cm²)
EB 8310-5 EN
A9 A5
A4
A9 Nut
A17 O-ring
A33 Nut
17. Fasten the top and bottom diaphragm
cases (A1, A2) together using the nuts
(A21) and bolts (A20). Tighten the nuts
evenly. Observe tightening torques.
18. Type 3271: remove the vent plug (A16)
from the top signal pressure connection
(S) and screw it onto the bottom connec-
tion.
Type 3277: remove the vent plug (A16).
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.
19. Affix a new nameplate with changed
symbol and new configuration ID to the
actuator.
A33
A36
A35
A34 A7
A34
A35
A36
Operation
A17 A5 A4
Slotted nut
Compressor
Spacer
29