Logix
®
Digital Positioners FCD LGENIM0110-0 05/16
flowserve.com
15
18
MOUNTING AND INSTALLING
18.1 Mounting to Mark One Linear
Valves
To mount a Logix
®
positioner to a Valtek linear
Mark One valve, refer to
Error! Reference source not
found.
and proceed as outlined below.
1
Remove washer and nut from follower pin assembly.
Insert pin into the appropriate hole in follower arm,
based on stroke length. The stroke lengths are
stamped next to their corresponding holes in the
follower arms. Make sure the unthreaded end of the
pin is on the stamped side of the arm. Reinstall lock
washer and tighten nut to complete follower arm
assembly.
2
Slide the slot in the follower arm assembly over the
flats on the position feedback shaft in the back of the
positioner. Make sure the arm is pointing toward the
customer interface side of the positioner. Slide the
lock washer over the threads on the shaft and tighten
down the nut.
3
Align the bracket with the three outer mounting holes
on the positioner. Fasten with 1/4" bolts.
4
Place a washer over one of the mounting bolts.
Screw one mounting bolt into the hole on the yoke
mounting pad nearest the valve. Stop when the bolt is
approximately
3⁄16" from being flush with mounting
pad.
5
Slip the large end of the teardrop shaped mounting
hole in the back of the positioner/bracket assembly
over the mounting bolt. Slide the small end of the
teardrop under the mounting bolt and align the upper
mounting hole.
6
Insert the upper mounting bolt and tighten the bolting.
7
Position the take-off arm mounting slot against the
stem clamp mounting pad. Apply Loctite 222 to the
take-off arm bolting and insert through washers into
stem clamp. Leave bolts loose.
8
Slide the appropriate pin slot of the take-off arm,
based on stroke length, over the follower arm pin.
The appropriate stroke lengths are stamped by each
pin slot.
NOTE:
The feedback shaft has a clutch mechanism
that allows for over-rotation of the shaft for easy
adjustments.
9
Center the take-off arm on the rolling sleeve of the
follower pin.
10
Align the take-off arm with the top plane of the stem
clamp and tighten bolting. Torque to 120 in-lb.
NOTE:
If mounted properly, the follower arm should be
horizontal when the valve is at 50% stroke and should
move approximately ±30° from horizontal over the full
stroke of the valve. If mounted incorrectly, a stroke
calibration error will occur and the indicator lights will blink
a RGGY code indicating the position sensor has gone out
of range on one end of travel or the travel is too small.
Reposition the feedback linkage or rotate the position
sensor to correct the error.
NOTE:
To virtually eliminate non-linearity, use the
Linearization feature in the Custom Characterization page
of the DTM.
Figure 5: Mounting to Mark One Linear Valves
