Direct Attachment; Type 3277-5 Actuator - Samson 3730-2 Mounting And Operating Instructions

Attachment to the control valve – Mounting parts and accessories

4.1 Direct attachment

4.1.1 Type 3277-5 Actuator
− Required mounting parts and accesso-
ries: Table 1 on page 50
− Observe the travel table on page 21.
Actuator with 120 cm² (see Fig. 3)
Depending on the type of positioner attach-
ment, the signal pressure is routed either left
or right of the yoke through a hole to the ac-
tuator diaphragm. Depending on the fail-
safe action of the actuator "actuator stem ex-
tends" or "actuator stem retracts" (valve clos-
es or opens upon supply air failure), the swi-
tchover plate (9) must first be attached to the
actuator yoke. Align the switchover plate
with the corresponding 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
on the positioner, making sure the two
seals (6.1) are seated properly.
2. Remove screw plug (4) on the back of
the positioner and seal the signal pres-
sure output (38) 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 it and screw tight so that the
mounting screw is located in the groove
of the actuator stem.
4. Mount cover plate (10) with narrow side
of the cut-out (Fig. 3, on the left) pointing
towards the signal pressure connection.
22
Make sure that the gasket (14) points to-
wards the actuator yoke.
5. 15 mm travel: Keep the follower pin (2)
on the M lever (1) on the back of the po-
sitioner in the pin position 35 (delivered
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.
6. Insert formed seal (15) into the groove of
the positioner housing and insert the seal
(10.1) on the back of the housing.
7. Place positioner on the cover plate (10)
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
rotary pushbutton. 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.
Note
The following applies to all types of attach-
ment except for direct attachment to
Type 3277-5:
The signal pressure output at the back must
be sealed by the screw plug (4, order no.
0180-1254) and the associated O-ring (or-
der no. 0520-0412).
8. Mount cover (11) on the other side.
Make sure that the vent plug is located at
the bottom when the control valve is in-
EB 8384-2 EN