2.5
Attachment to rotary
actuators
The positioner is mounted to the rotary actu-
ator using two pairs of double brackets.
Refer to Table 5 on page 18 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,
you have to 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. 12 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 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
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 2.6.
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. Con-
sidering 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. 12). 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.
34
EB 8384-4 EN
Attachment to the control valve – Mounting parts and accessories
1.2
1.1
1
2
4.1
4.2
5
3
Fig. 11 · Mounting the coupling wheel with Type 3278
Mounting flange
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