Type 3277 Actuator - Samson 3730-2 Mounting And Operating Instructions

Attachment to the control valve – mounting parts and accessories

2.1.2 Type 3277 Actuator

Refer to Table 2 on page 14 or the required
mounting parts as well as the accessories
with their order numbers.
Note the travel table on page 13!
Actuators with 240 to 700 cm
The positioner can be mounted either on the
left or on the right side of the yoke. The sig-
nal pressure is routed to the actuator over
the connection block (12), for actuators with
fail-safe action "Actuator stem extends" in-
ternally through a bore in the valve yoke
and for "Actuator stem retracts" through ex-
ternal 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. 4, 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 700 cm
follower pin (2) at lever M (1) on the
back of the positioner from pin position
35, reposition it in the bore for pin posi-
tion 50 and screw tight.
For actuators 240 and 350 cm
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)
18
EB 8384-2 EN
2
6. Make sure that the tip of the gasket (16)
7. Place the connection block (12) with the
, remove the
2
8. Mount cover (11) on the other side.
2 with
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 (Fig. 16). 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.
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 repo-
sition the gasket (16) turned by 180°.
The previous version of the connection
block (Fig. 4, bottom) requires the switch
plate (13) to be turned such that the cor-
responding actuator symbol points to the
marking.
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.
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.