Samson 3725 series, Mounting And Operating Instructions

Page: 24 / 68

24 EB 8394 EN
Mounting the positioner
4.6 Attachment to rotary actua-
tors
The positioner is mounted to the rotary actu-
ator using a mounting bracket.
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Required mounting parts and accesso -
ries: Table 6 on page 32.
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Before attaching the positioner onto the
SAMSON Type 3278 Rotary Actuator
(160 cm²) or VETEC Type S160 Actuator,
first mount the adapter (13) to the free
end of the shaft end using four screws
(10, 1).
1. Place follower clamp (3) on the slotted
actuator shaft or adapter (13).
2. Place coupling wheel (4) with flat side
facing the actuator on the follower clamp
(3). Refer to Fig. 10 to align slot so that it
matches the direction of rotation when
the valve is in its closed position.
3. Fasten the coupling wheel (4) and follow -
er clamp (3) tightly onto the actuator
shaft using screw (4.1) and disk spring
(4.2).
4. Mount connecting plate (6) or pressure
gauge bracket (7) with pressure gauges
(8) on the positioner, making sure the
two seals are seated properly.
5. Fasten the mounting bracket (10) to the
actuator using four screws (10.1).
6. Unscrew the standard follower pin (2)
from the positioner's M lever (1). Use the
metal follower pin (Ø 5 mm) included in
the mounting kit and screw tight into the
hole for pin position 90°.
7. Place positioner on the mounting bracket
(10) and fasten tight. Taking the actua
-
tor's direction of rotation into account,
adjust lever (1) so that it engages in the
slot of the coupling wheel (4) with its fol
-
lower pin (Fig. 11).
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The lever (1) must be parallel to the long
side of the positioner when the actuator
is at half its angle of rotation.
8. Stick the scale plate on the coupling
wheel (4) so that the arrow tip indicates
the closed position and it can be easily
read when the valve is installed.
Fig. 10: Direction of rotation