2 VA-8052 Technical Bulletin
13. Drive the actuator fully up
and down at least three
complete cycles (by
alternately applying 0 and
10 VDC), checking to see
that the upper and lower
limit switches click. Note:
The lever plate must not
contact the upper stop and
the drive coupler must not
contact the bottom surface
of the actuator yoke (see
Fig. 1).
Installation of VA-8052-1 on
3/4 in. Stroke, 2-Way Push
Down to Open (PDO) Valves
1 . Unpack the VA-8052
Actuator and insure that the
feedback potentiometer
plunger is on top of the
coupler arm.
2. Install the valve packing
that is provided according
to the instructions included
with it.
3. Thread the 1/4 in. Palnut,
open side down, onto the
valve stem and all the way
to the end of the threads.
4. Loosely install the actuator
by sliding the actuator yoke
between the spring plate
and valve centerpiece
surface. Finger tighten the
spring plate to hold the
actuator in place (see
Fig. 1).
5. Obtain a source of 24 VAC
power and wire to the AC
and COM terminals (see
Fig. 4). Wire a source of 0
to 10 VDC to the IN and
COM terminals. Check to
see that the stroke
potentiometer is fully CCW
(see Fig. 1).
6. Thread the knurled coupler
onto the valve stem until
approximately 1/4 in. of
thread remains between the
knurled coupler and the
Palnut. Note: It may be
necessary to pull the valve
stem up to meet the coupler
or to apply 0 to 10 VDC to
position the coupler above
the valve stem.
7. Secure the actuator in place
by tightening the spring
plate with a large
screwdriver (see Fig. 2).
8. Stroke the actuator to the
stem-up position by
applying 0 VDC. Thread
the knurled coupler onto the
valve stem until the knurled
coupler fits snugly.
9. Increase the signal slightly
(to 3 to 4 VDC) so that
tension on the knurled
coupler is relieved. When
the lever stops moving,
thread the knurled coupler
on another 1 to 1-1/4 turn.
10. Reduce the signal to zero to
stroke the actuator to the
stem-up position. The limit
switch should click softly at
the full stem-up position. If
not, repeat step 9.
11. With the valve driven fully
up, thread the Palnut up the
stem until it contacts the
coupler. Tighten the Palnut
with a 7/16 in. wrench while
holding the nut on top of the
coupler with a 1/2 in. wrench.
12. Drive the actuator fully up
and down at least three
complete cycles, (by
alternately applying 0 and
10 VDC) checking to see
that the upper limit switch
clicks. Note: The lever
Fig. 2: Isometric Drawing of VA-8052
Fig. 3: Internal View of V-3000 Actuator
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