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Design and principle of operation
A42
A40
A23
Actuator stem extends
A39
A38
S
FA
S
FE
Switchover/
connecting plate:
Actuator stem extends
Fig. 3-2: Type 2780‑2
3-2
A53
A38 A39
A25
Actuator stem retracts
A53
Actuator stem retracts
S
FE
A48
A20
S
FA
A1
A48
A25-29
A8
A46
A2
A5
A23
Fig. 3-1: Type 2780‑1
A1
Actuator stem
A2
Lower actuator section
A5
Actuator stem
A8
Diaphragm case
A20
Vent plug
A23
Coupling nut
A25‑
Compression spring
29
A38
Metal plate
A39
Diaphragm plate
A40
Bottom diaphragm case
A42
Top diaphragm case
A46
Stop bushing
A48
Diaphragm
A53
Collar nut
S
Signal pressure connection
FA
(actuator stem extends)
S
Signal pressure connection
FE
(actuator stem retracts)
EB 5840 EN
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