Samson 3277 Mounting And Operating Instructions page 7

Caution!
Do not loosen the nut (1.1) on the actuator
stem. It is painted over to protect it.
If, however, it has been loosened, it is essen-
tial that the dimension a (Figs. 3 and 4)
measured from the top of the nut to the bot-
tom of the actuator stem is kept.
5. Apply lubricant/sealant (order no.
8152-0043) to the sealing places on the
actuator stem.
6. Turn over top diaphragm case (5). Place
the actuator stem with diaphragm plate,
diaphragm and metal plate (7.1), if ap-
plicable in the case.
7. Insert the springs (6) and slide the yoke
with bottom diaphragm case over the
actuator stem.
8. Screw tight the nuts and bolts of the dia-
phragm cases. Remove vent plug (3) in
Type 3277 Actuator.
Proceed in the same manner for the
Type 3277-5 Actuator intended for the mi-
cro-valve, but additionally attach the bush-
ing (2.1) for the mechanical travel stop.
The springs now press from below against
the diaphragm plate and cause the actuator
stem to retract (fail-safe action). The actuator
stem only starts to extend when the signal
pressure overcomes the force of the springs.
9. Record the changed fail-safe action on
the nameplate!
Reversing the operating direction (fail-safe action)
Reversing the fail-safe action "Actuator
stem retracts" to "Actuator stem extends"
1. Unthread nuts and remove the bolts (9)
and lift off the top diaphragm case (5).
2. Pull the actuator stem with diaphragm
plate, diaphragm and metal plate (7.1),
if applicablethe diaphragm plate (7) out
of the yoke and bottom diaphragm case
(10).
3. Unscrew nut (1), while holding the nut
(1.1) stationary or clamping the actuator
stem with a suitable tool.
Caution! Proceed carefully to avoid
damaging the seals of the actuator stem.
4. Remove the diaphragm plate with dia-
phragm and replace them in reverse or-
der. Screw tight nut (1).
5. Coat the sealing parts of the actuator
stem with sealant/lubricant (order no.
8152-0043).
6. Insert the actuator stem with diaphragm
plate, diaphragm and metal plate (7.1),
if applicable, into the bottom diaphragm
case with yoke.
7. Insert springs (6) and place the top dia-
phragm case back on. Screw tight the
nuts and bolts of the diaphragm cases.
8. Screw the vent plug (3) into the top load-
ing pressure connection of the
Type 3277 Actuator.
Proceed in the same manner for the
Type 3277-5 Actuator intended for the mi-
cro-valve, but additionally attach the bush-
ing (2.1) for mechanical travel stop.
The springs now press from the top against
the diaphragm plate and cause the actuator
stem to extend (fail-safe action). The actua-
7
EB 8311 EN