Samson 2780-1 Mounting And Operating Instructions page 34

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).
A42 A53
A40
A23
Actuator stem extends
Fig. 8-1: Type 2780‑1
8-4
A38 A39 A25
A1
Actuator stem retracts
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
S
A23 Coupling nut
FE
A25 Compression spring
A48
A38 Metal plate
A39 Diaphragm plate
A20
A40 Bottom diaphragm case
A42 Top diaphragm case
S
FA
A48 Diaphragm
A53 Collar nut
S Signal pressure connection
FA
(actuator stem extends)
S Signal pressure connection
FE
(actuator stem retracts)
EB 5840 EN