Samson 3277 Mounting And Operating Instructions page 7

Caution!
Do not loosen the nut (1.1) on the actuator
stem of 350 and 700 cm
painted over to protect it. If, however, it
does become loose, it is essential that the
dimension "a" (Fig. 3 and 4) from the top
of the nut to the bottom of the actuator stem
is kept.
5. Apply lubricant/sealant (order no.
8152-0043) to the sealing part of the
actuator stem.
6. Turn the top diaphragm case (5) upside
down and place in to it the actuator
stem with diaphragm plate, diaphragm
and metal plate (7.1 in Fig. 4), if one
exists.
7. Insert the springs (6) and slide the yoke
with the lower diaphragm case over the
actuator stem.
8. Screw diaphragm cases back together.
Remove vent plug (3) on Type 3277 Ac-
tuator.
Proceed in the same manner for the Type
3277-5 Actuator intended for the micro-
valve, but additionally attach the bushing
(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!
2
actuators. It is
Reversing the operating direction (fail-safe action)
Reversing the fail-safe action "actuator
stem retracts" to "actuator stem extends"
Note!
The operating direction of actuators with
2
700 cm (travel = 30 mm) that are mounted
to valves with 15 mm travel can only be
changed when the actuator stem installed
(length = 245 mm) is replaced by an actua-
tor stem (order no. 0290-4727) that is 20
mm longer.
1. Unthread the nuts and remove the bolts
(9) from the diaphragm cases. Lift off
the top diaphragm case (5).
2. Pull the actuator stem with diaphragm
plate, diaphragm and metal plate
(7.1), if one exists, out of the yoke and
the bottom diaphragm case (10).
3. Unscrew nut (1), while holding the nut
(1.1) stationary with a suitable tool or
clamp the actuator stem.
Caution: Proceed carefully to avoid da-
maging the seals of the actuator stem.
4. Turn over diaphragm plate with dia-
phragm and screw back on the nut (1).
5. Apply lubricant/sealant (order no.
8152-0043) to the sealing part of the
actuator stem.
6. Insert actuator stem with diaphragm
plate, diaphragm and metal plate
(7.1), if one exists, into the bottom dia-
phragm case with the yoke.
7. Insert springs (6) and place back on the
top diaphragm chamber. Tighten using
nuts, bolts and washers.
8. Screw a vent plug (3) in the top loading
pressure connection in Type 3277 Actu-
ator.
7
EB 8311 EN