Samson 2780-1, Mounting And Operating Instructions, Page: 25 / 52

EB 5840 EN 5-3
Mounting
5.2.2 Connecting the air
supply
The maximum permissible supply pressure is
4 bar in throttling service.
How and with which accessories the air sup‑
ply is connected depends on the actuator
model and its direction of action. See 'Direc‑
tion of action', 'Signal pressure routing' and
'Accessories' in the 'Design and principle of
operation' section.
When using a connecting plate, make sure
the following conditions are met:
−
The gasket for the connecting plate is
correctly inserted.
− The connecting plate has threaded holes
with NPT and G threads. The signal pres‑
sure connection that is not used is sealed
with the rubber seal and square plug.
a) Actuator stem extends
1. Apply a signal pressure that corresponds
to the lower signal pressure range value
to the connection on the bottom dia‑
phragm case.
2. Screw the vent plug into the connection
on the top diaphragm case.
b) Actuator stem retracts
1. Apply a signal pressure that corresponds
to the upper signal pressure range value
to the connection on the top diaphragm
case.
2. Screw the vent plug into the connection
on the bottom diaphragm case.