Samson 3725 series Mounting And Operating Instructions - 4.1 Direct Attachment
4.1 Direct attachment
4.1.1 Type 3277-5 Actuator
Refer to Table 1 on page 26 for required
mounting parts and accessories.
Note the travel table on page 13!
Actuator with 120 cm²
Depending on the type of positioner attach-
ment, the signal pressure is routed either left
or right of the yoke through a bore to the
actuator diaphragm.
Depending on the fail-safe action of the ac-
tuator "Actuator stem extends" or "Actuator
stem retracts" (valve closes or opens if the
supply air fails), the switchover plate (9)
must first be attached to the actuator yoke.
Align the switchover plate with the corre-
sponding symbol for left or right attachment
according to the marking (view looking onto
the switchover plate).
1. Mount connecting plate (6) or pressure
gauge bracket (7) with pressure gauges
onto the positioner, making sure both
seal rings (6.1) are seated properly.
2. Insert the screw (4) on the back of the
positioner into the hole below it (park
position) (see Fig. 6) and seal the signal
pressure output on the connecting plate
(6) or on the pressure gauge bracket (7)
with the stopper (5) included in the ac-
cessories.
3. 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.
4. 15 mm travel: Keep the follower pin (2)
at lever M (1) on the back of the
positioner in the pin position 35 (deliv-
ered state).
7.5 mm travel: Remove the follower pin
(2) from the pin position 35, reposition it
in the hole for pin position 25 and screw
tight.
5. Insert formed seal (15) into the groove of
the positioner housing.
6. Place positioner on the actuator in such
a manner that the follower pin (2) rests
on top of the follower clamp (3). During
which, press on the ribbed area shown
in Fig. 5 to lock the pick-up lever in the
top position.
The lever (1) must rest on the follower
clamp with spring force.
Mount the positioner on the actuator us-
ing the two fixing screws.
7. 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 8394 EN
Attachment to the control valve – Mounting parts and accessories
Fig. 5 · Locking the pick-up lever in position