Samson 2780-1, Mounting And Operating Instructions, Page: 34 / 52

8-4 EB 5840 EN
Servicing and conversion work
phragm (A48) and metal plate (A38) in‑
to the bottom diaphragm case (A40).
8. Tighten the collar nut (A53).
9. Place the springs (A25) in the bottom di‑
aphragm case (A40), centering them in
the intended recesses.
10. Place on the top diaphragm case (A42).
11. Fasten the top and bottom diaphragm
cases (A42, A40) together with the nuts
and bolts.
b) Version with direction of
action "actuator stem
retracts"
1. Lift off the top diaphragm case (A42).
2. Unscrew the collar nut (A53).
3. Remove the diaphragm plate (A39) to‑
gether with the diaphragm (A48), metal
plate (A38) and actuator stem (A1) out
of the bottom diaphragm case (A40).
4. Place a new diaphragm on the metal
plate (A38). Place on the diaphragm
plate (A39).
5. Check the sealing element on the collar
nut (A53). If necessary, renew it.
6. Apply a suitable sealant and lubricant to
the actuator stem (A1).
7. Insert the actuator stem (A1) together
with the diaphragm plate (A39), dia‑
phragm (A48) and metal plate (A38) in‑
to the bottom diaphragm case (A40).
8. Tighten the collar nut (A53).
9. Place on the top diaphragm case (A42).
A1 Actuator stem
A20 Vent plug
A23 Coupling nut
A25 Compression spring
A38 Metal plate
A39 Diaphragm plate
A40 Bottom diaphragm case
A42 Top diaphragm case
A48 Diaphragm
A53 Collar nut
S
FA
Signal pressure connection
(actuator stem extends)
S
FE
Signal pressure connection
(actuator stem retracts)
A42 A53 A38 A39
A48
A40
A23 A1
A25
A20
S
FE
S
FA
Actuator stem extends
Actuator stem retracts
Fig. 8-1: Type 2780‑1