Samson 3730 Series Mounting And Operating Instructions page 42

Installation
Î Make sure that the vent plug is locat-
ed at the bottom when the control
valve is installed to allow any con-
densed water that collects to drain
off.
b) Type 3277 Actuator
Î Required mounting parts and accesso-
ries: Table 5-6
Î Observe the travel table on page 5-5.
Actuators with 175 to 750 cm² effective
areas (see Fig. 5-6)
Mount the positioner on the yoke. The signal
pressure is routed to the actuator over the
connection block (12), for actuators with fail-
safe action "actuator stem extends" internal-
ly through a hole in the valve yoke and for
"actuator stem retracts" through an external
pipe.
1. Place follower clamp (3) on the actuator
stem, align it 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 (Fig. 5-6, on the left) point-
ing towards the signal pressure connec-
tion. Make sure that the gasket (14)
points towards the actuator yoke.
3. For actuators with 355, 700 or 750 cm²,
remove the follower pin (2) on the M le-
ver (1) on the back of the positioner from
pin position 35, reposition it in the hole
for pin position 50 and screw tight.
While doing so, hold the lever in the
middle to ensure that it does not rest at
the end stops.
5-8
For actuators 175, 240 and 350 cm²
with 15 mm travel, keep the follower pin
(2) in pin position 35.
4. Insert molded seal (15) into the groove of
the positioner housing.
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 po-
sitioner shaft in position at the cap or ro-
tary pushbutton. The lever (1) must rest
on the follower clamp with spring force.
Fasten the positioner on the cover plate
(10) using the two fastening screws.
6. Make sure that the tip of the gasket (16)
projecting from the side of the connec-
tion block is positioned to match the ac-
tuator symbol for the actuator's fail-safe
action "actuator stem extends" or "actu-
ator stem retracts". If this is not the case,
unscrew the three fastening screws and
lift off the cover. Turn the gasket (16) by
180° and re-insert it.
The old connection block version
(Fig. 5-6, bottom) requires the switch
plate (13) to be turned to align the actu-
ator symbol with the arrow marking.
7. Place the connection block (12) with the
associated seals against the positioner
and the actuator yoke and fasten using
the screw (12.1). For actuators with fail-
safe action "actuator stem retracts", ad-
ditionally remove the stopper (12.2) and
mount the external signal pressure pipe.
8. Mount cover (11) on the other side.
EB 8384-4 EN