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2. Unscrew the nuts (A21) and bolts (A20)
on the diaphragm case.
3. Lift off the top diaphragm case (A1).
4. Pull the actuator stem (A7) together with
the diaphragm plate (A5) and dia-
phragm (A4) out of the bottom dia-
phragm case (A2).
5. Remove the springs (A10).
6. Unscrew the collar nut (A15).
7. Take the compressor (A27), diaphragm
plate (A5), and diaphragm (A4) off the
actuator stem (A7) and place them back
on again in the reverse order.
8. Tighten the collar nut (A15).
9. Apply a suitable lubricant to the actuator
stem (A7).
10. Insert the actuator stem (A7) together
with the diaphragm plate (A5) and dia-
phragm (A4) into the bottom diaphragm
case (A2). Make sure that the radial
shaft seal (A40) is not damaged.
Fig. 14: Travel stop for 120 cm² version
EB 8317 EN
11. Place the springs (A10) in the bottom di-
aphragm case (A2), centering them in
the intended recesses.
12. Place on the top diaphragm case (A1).
13. Without spring compression: fasten the
top and bottom diaphragm cases (A1,
A2) together with the nuts (A21) and
bolts (A20). Observe tightening torques.
With spring compression: fasten the top
and bottom diaphragm cases (A1, A2)
together with the nuts (A21) and long
bolts (A22). Fasten the nuts (A21) and
short bolts (A20). Observe tightening
torques.
The actuator springs, which now push
against the diaphragm plate from above,
cause the actuator stem to extend. The
signal pressure is connected to the bot-
tom connection (S) on the bottom dia-
phragm case. As a result, the actuator
stem retracts opposing the spring force
as the signal pressure increases.
A75
A79
A73 Spindle
A73
A75 Cover
A76 Lock nut
A76
A77 Top diaphragm case
A79 Lock nuts
A77
Operation
35
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