Attachment To Rotary Actuators - Samson 3730 Series Mounting And Operating Instructions

Attachment to the control valve – Mounting parts and accessories
2.4 Attachment to rotary
actuators
The positioner is mounted to the rotary actu-
ator using two pairs of double brackets.
Refer to Table 4 on page 17 for the required
mounting parts as well as the accessories
with their order numbers.
Prior to the attachment of the positioner to
the SAMSON Type 3278 Rotary Actuator,
mount the associated adapter (5) to the free
end of the rotary actuator shaft.
Note! On installing the positioner as de-
scribed below, it is imperative that the actu-
ator's direction of rotation be observed.
1. Place follower clamp (3) on the slotted
actuator shaft or the adapter (5).
2. Place coupling wheel (4) with flat side
facing the actuator on the follower
clamp (3). Refer to Fig. 9 to align slot so
that it matches the direction of rotation
when the valve is in its closed position.
3. Screw coupling wheel and follower
clamp tightly onto the actuator shaft
using screw (4.1) and disk spring (4.2).
4. Screw the bottom pair of brackets (10.1)
with the bends pointing either to the in-
side or to the outside (depending on the
actuator size) to the actuator case. Posi-
tion top pair of brackets (10) and screw
tight.
5. Mount connecting plate (6) or pressure
gauge bracket (7) with pressure gauges
26
EB 8384-3 EN
to the positioner, making sure both
O-rings are seated properly.
For double-acting, springless rotary ac-
tuators, a reversing amplifier is required
to attach the positioner to the actuator,
see section 2.5.
6. Unscrew the standard follower pin (2)
from the positioner's lever M (1). Use the
metal follower pin (Ø5) included in the
mounting kit and screw tight into the
bore for pin position 90°.
7. Place positioner on top pair of brackets
(10) and screw tight. Considering the
actuator's direction of rotation, adjust le-
ver (1) so that it engages in the slot of
the coupling wheel (4) with its follower
pin (see Fig. 9). It must be guaranteed
that the lever (1) is parallel to the long
side of the positioner when the actuator
is at half its angle of rotation.
8. Stick scale plate (4.3) on the coupling
wheel so that the arrow tip indicates the
closed position, and it can be easily
read when the valve is installed.
1
2
3
Fig. 8 · Mounting the coupling wheel with Type 3278
1.2
1.1
4.1
4.2
5
Actuator flange