Samson 3730-0 Mounting and operating instructions - 4.1.2 Type 3277 Actuator
4.1.2 Type 3277 Actuator
Refer to Table 2 on page 11 for the required
mounting parts and the accessories with
their order numbers as well as to the travel
table on page 10!
Actuators with 240 to 700 cm²
Mount the positioner on the yoke as shown
in Fig. 5. The signal pressure is routed to the
actuator over the connection block (12), for
actuators with fail-safe action "Actuator
stem extends" internally through a bore in
the valve yoke and for "Actuator stem re-
tracts" through external piping.
1. Place follower clamp (3) on the actuator
stem, align and screw tight so that the
mounting screw is located in the groove
of the actuator stem.
2. Mount cover plate (10) with narrow side
of the cut-out opening (Fig. 5, on the left)
pointing towards the signal pressure
connection. Make sure that the bonded
gasket (14) points towards the actuator
yoke.
3. For actuators with 355/700 cm², re-
move the follower pin (2) at lever M (1)
on the back of the positioner from pin
position 35, reposition it in the bore for
pin position 50 and screw tight.
For actuators 240 and 350 cm
2
with
15 mm travel, the follower pin (2) re-
mains in pin position 35.
4. Insert formed seal (15) in the groove of
the positioner casing.
5. Place positioner on the cover plate in
such a manner that the follower pin (2)
rests on the top of the follower clamp
(3). Adjust the lever (1) correspondingly
and open the positioner cover to hold
the positioner shaft in position at the cap
or the switch. The lever (1) must rest on
the follower clamp with spring force.
Mount the positioner on the cover plate
(10) using the two fixing screws.
6. Make sure that the tip of the gasket (16)
projecting from the side of the connec-
tion block (12) is positioned above the
actuator symbol that corresponds with
the actuator with fail-safe action "Actua-
tor stem extends" or "Actuator stem re-
tracts." If necessary, remove the three
fixing screws and the cover. Then reposi-
tion the gasket (16) turned by 180°. The
previous version of the connection block
(Fig. 5, bottom) requires the switch plate
(13) to be turned such that the corre-
sponding actuator symbol points to the
marking.
7. Place the connection block (12) with the
associated seal rings against the
positioner and the actuator yoke. Screw
it tight using the fixing screw (12.1). For
actuators with fail-safe action "Actuator
stem retracts", additionally remove the
stopper (12.2) and fit on the external
signal pressure piping.
8. Mount cover (11) on the other side.
Make sure that the vent plug points
downwards when the control valve is in-
stalled to allow any condensed water
that collects to drain off.
14
EB 8384-0 EN
Attachment to the control valve – Mounting parts and accessories