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Retrofit Actuator
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MS40-7073 a n d
MS40-7153
Instructions
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P ag e 2 • D R IS T EE M R e t r o fi t a ct u at o r i n s t r u c t i o n s
Ta b l e o f c o n t e n t s
Actuator removal instructions
Remove existing actuator and linkage — electronic
hydraulic actuator
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Remove existing actuator — existing DuraDrive
actuator
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Assembly
Assembling linkage to valve — electronic hydraulic
actuator only
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Spring-return actuators without manual override —
2-way valves
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Spring-return actuators without manual override —
3-way valves
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Wiring diagram
Typical wiring diagram for MS40 series
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Temperature, humidity, and NEMA rating
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Remove spring, washer, and brass extension attached to
valve stem.
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Figure 4-1:
Assembling linkage to valve — changing from a MP55XX
Typical Valve Body
(2-Way shown)
Linkage
Typical Actuator
(MS41-707X shown)
1 Locate and remove the two
jam nuts taped to the
linkage housing, then screw
the nuts to the bottom of the
valve stem (at least 1/4" of
the stem should extend
above the top nut).
2 Tighten the jam nuts
against each other,
using two 5/16"
open-end wrenches.
3 Raise the valve
stem to the full
up position.
6 Rotate the pinion shaft
CW to fully lower the
rack, and then position
the linkage over the
valve stem.
7 Fully thread the
linkage rack onto
the valve stem,
and then engage
the valve mounting
nut in the linkage
adaptor.
9 Rotate the pinion
shaft CCW to raise
the rack and expose
the jam nuts.
10 Tighten the jam
nuts against the
rack, using a 5/16"
open-end wrench
on the lower jam
nut.
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4 Loosen the anti-rotation
screw and disengage it
from the slot on the
bottom of the actuator.
Remove the actuator if
necessary.
5 Loosen the shaft
clamp nuts and
remove the actuator
from the linkage.
8 Orient the
linkage on the
valve as desired,
and then tighten
the valve
mounting nut
against the
linkage adaptor,
using a 1-5/8"
open end wrench.
Assembling linkage to valve.
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Figure 5-1:
2 Slide the actuator, "L" side
facing out, onto the linkage's
pinion shaft.
1 Rotate the linkage's pinion shaft to the valve open
position:
• Stem Up Closed Valves - Rotate the pinion shaft
CW to extend the linkage rack to the down position.
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3 Align the actuator with the
linkage.
4 Slide anti-rotation screw NYBA-161
half way into the slot on the bottom
of the actuator, and then tighten
the nut on the anti-rotation screw.
•
MS40-704X, MS40-707X, MS40-715X Proportional
Control - Change the reversing switch setting from
direct acting (L) to reverse acting (R), and then
apply power to drive the actuator to the end of
stroke.
d. When finished, return the switch setting to direct acting (L).
Optional: Affix the Open and
Closed labels to the indicator in
the appropriate positions.
OPENCLOSED
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6 Lightly finger-tighten the two nuts on the shaft clamp(s), and
then set up the actuator and tighten the shaft clamp(s) as
follows:
For N.C. Operation, Stem Up Closed Valves
a. Power the actuator to the end of stroke
b. Verify that the linkage rack is still in the full down position.
c. Using a 10 mm wrench or socket, torque the nuts equally
on the shaft clamp(s), 8 to 10 lb-ft (11 to 14 N-m). The
actuator is now in the open position, at the end of stroke.
5 Make sure the actuator is in
full contact with the plastic
stand-offs on the linkage.
NYBA-161
Anti-Rotation Screw for
MS40-707X, MS40-715X
1 Caution: When used on a VB-9XXX or
similar 1/2" to 1-1/4" (15 mm to 32 mm)
valve body, push the valve stem all the
way down and adjust the rack to get at
least 1/32" (1 mm) clearance above the top
of the packing. Use only 35 lb-in. (16 N-m)
MS40-704X actuators on obsolete valves.
Stem or plug damage may result from
using actuators with higher output torques.
wiring diagrams supplied with your humidifier.
Mounting spring-return actuator on 2-way valve and setting-up actuator/linkage/valve assembly.
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Figure 6-1:
2
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2 Tip: A 1-5/8" open-end wrench can be used to
measure the amount of rotation (measured between
opposite sides of the slot).
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3 Tip:
• MS40-707X, MS40-715X Proportional Control - Change the
reversing switch setting from direct acting (L) to reverse acting (R),
and then apply power to drive the actuator to the end of stroke.
When finished, return the switch setting to direct acting (L).
1 MS40-707X and MS40-715X
actuators are shipped at the
end of stroke, without preload.
6 Apply power to the actuator to rotate it CCW into alignment
with the mounting plate, and then slide anti-rotation screw
NYBA-161 halfway into the slot on the bottom of the
actuator. Tighten the nut on the anti-rotation screw.
Warning: Take care not to pinch your fingers or hand
between the actuator and the mounting plate, when
powering the actuator into alignment.
Caution: When setting the valve preload, power must be
used to position the actuator. Do not manually force the
actuator into the mounting position. If forced, damage to the
pinion shaft or improper close-off may occur.
1-3/8"
3 Align the actuator with the
mounting plate, then rotate it
10° CW. Note that 1-3/8"
movement at the anti-rotation
slot (measured at the antirotation slot's centerline) is
sufficiently equal to 10°.
4 Make sure the actuator is in
full contact with the plastic
stand-offs on the linkage.
5 Holding the actuator at the 10°
position, use a 10 mm wrench or
socket to tighten the two nuts
equally on the shaft clamp, 8 to
10 lb-ft (11 to 14 N-m).
2 Slide the actuator, "L" side
facing out, onto the linkage's
pinion shaft.
10°
Optional: Affix the Open and
Closed labels to the indicator
in the appropriate positions.
OPENCLOSED
NYBA-161
Anti-Rotation Screw for
MS40-707X, MS40-715X
2
1-5/8"
1-5/8" Open-End
Wrench
1 Rotate the linkage's pinion shaft CCW,
to retract the rack (stem up).
Mounting MS40-707X and MS40-715X and setting-up actuator/linkage/valve assembly.
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Figure 7-1:
Typical wiring diagram for MS40-7073 and MS40-7153 proportional actuators.
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