Samson 3730-6, Mounting And Operating Instructions

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4.4 Attachment to rotary
actuators
Refer to Table 5 on page 43 for the required
mounting parts and accessories.
Note the travel table on page 21!
The positioner is mounted to the rotary actu-
ator using two pairs of brackets.
Prior to attaching 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 attaching the positioner as de-
scribed below, it is imperative that the actu-
ator's direction of rotation is 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 rota-
tion when the valve is in its closed posi-
tion.
3. Screw coupling wheel and follower
clamp tightly onto the actuator shaft us-
ing screw (4.1) and disk spring (4.2).
4. Screw the bottom pair of brackets
(10.1) with the bends pointing either to
the inside or to the outside (depending
on the actuator size) to the actuator
case. Position top pair of brackets (10)
and screw tight.
5. Mount connecting plate (6) or pressure
gauge bracket (7) with pressure gauges
to the positioner, making sure both
O-rings are seated properly.
For
double-acting
, springless rotary ac-
tuators, a reversing amplifier is re-
quired to attach the positioner to the
actuator, see section 4.5.
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 the top pair of
brackets (10) and screw tight. Consid-
ering the actuator's direction of rota-
tion, adjust lever (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 rota-
tion.
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.
30
EB 8384-6 EN
Attachment to the control valve – Mounting parts and accessories
1.2
1.1
1
2
4.1
4.2
5
3
Fig. 8 · Mounting the coupling wheel with Type 3278
Actuator flange