51-7
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
3. Attach the positioner to the pre-assembled mount-
ing bracket and fasten it with two hexagon head
screws (4) and two lock washers (3). Check that the
follower pin (15) is inserted in the slot of the take-off
arm (11) and the follower arm (12) is positioned at
a right angle to the outer edge of the positioner.
4. Tighten all screws and nuts.
NOTE: A slight unsymmetrical mounting increases
the linearity deviation but does not affect the per-
formance of the device. Depending on the actua-
tor size and stroke it may be necessary to flip the
take-off arm (Figure 6) by 180
°
and attach it to the
opposite side of the stem clamp bracket (8).
Follower Pin Adjustment
The positioner follower pin must be adjusted to match
the valve stroke in the following manner:
1. Adjust the follower pin ( 10 mm) as indi-
cated on the follower arm’s embossed scale.
2. Exhaust the actuator.
3. Loosen the follower pin and shift it along the fol-
lower arm until the control marking on the feed-
back gear (Figure 3) is horizontal (points to the
center of the feedback potentiometer). Fasten the
follower pin in this position.
4. Adjust the actuator to full stroke and check the fol-
lower pin adjustment the same way as described
in step 3. As the actuator strokes, the rotation of
the feedback gear should be between the inner
control markings. If the length of rotation is outside
the control markings, adjust the follower pin far-
ther out on the feedback lever to reduce the angle
of rotation.
NOTE: Stroke the actuator carefully and ensure the
follower arm does not interfere with valve parts,
actuator or positioner. Do not adjust the follower
pin (15) too near to the slot end of the take-off arm
(11). The minimum lateral distance should be ap-
proximately 0.2-inches (5 mm) to prevent binding
of the feedback mechanism.
ROTARY ACTUATORS
Mounting the Logix 500 Series positioner
on a quarter-turn actuator (closed by spring)
The mounting of a pneumatic double-piston part-turn
valve actuator (in accordance with VDI/VDE) is described
as an example by using the following equipment:
Part-turn valve actuator: AMG Type SAF, closed by
spring
Butterfly damper: 90
°
rotary angle
Pre-assembly: Mounting block with actuator, actua-
tor with damper (damper position is adapted with the
actuator stroke)
Figure 6: Mounting on a Rod Actuator (NAMUR)
1 2
3
4
5
6
7
8
9
10
17
16
12
13
14
11
15
18
1. Nut (4x)
2. Lock washer (4x)
3. Lock washer (2x)
4. Hexagon head screw (2x)
5. Actuator leg (left)
6. U-bolt (2x)
7. Stem clamp
8. Stem clamp bracket
9. Lock washer (2x)
10. Hexagon socket screw (2x)
11. Take-off arm
12. Follower arm
13. Washer
14. Nut
15. Follower pin
16. Hexagon socket screw
17. Washer
18. Mounting bracket
