Samson 3277, Монтаж и эксплуатация, Страница: 27 / 48

EB 8310-5 EN 27
Operation
6.4 Additional notes
concerning operation
Î
Label actuators with reduced supply
pressure with a sticker ("Max. supply
pressure limited to ... bar").
Î
Only apply the signal pressure to the sig-
nal pressure connection (S) on the dia-
phragm chamber of the actuator which
does not contain any springs (see Fig. 2
and Fig. 3).
Î
Only use vent plugs that let air through
them (A16 in Fig. 2 and Fig. 3).
6.5 Reversal of the direction of
action
The direction of action (and fail-safe action)
of pneumatic actuators can be changed. The
fail-safe action is indicated on the nameplate
by a symbol:
Actuator stem extends
Actuator stem retracts
Risk of bursting in the actuator.
Actuators are pressurized. Improper opening
can lead to actuator components bursting.
Before starting any work on the actuator, de-
pressurize all plant sections concerned and
the actuator.
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. They can be identified by the long
bolts protruding from the bottom of the actu-
ator.
Before starting any work on the actuator, re-
lieve the compression from the preloaded
springs (see section 9.3).
Risk of malfunction due to incorrect details
on the nameplate after the reversal of the di-
rection of action.
After reversal, the symbol and configuration
ID on the nameplate are no longer valid.
Contact SAMSON to request a new name-
plate.
6.5.1 Reversal of the direction
of action from stem ex-
tends to stem retracts
1. Lift the actuator off the valve. See sec-
tion 9.2.
2. Unscrew the nuts (A21) and bolts (A20)
on the diaphragm case.
3. Relieve the spring compression of actua-
tors with preloaded springs (see sec-
tion 9.3).
4. Lift off the top diaphragm case (A1) and
remove springs (A10).
DANGER !
WARNING
!
NOTICE
!