Submittal Sheet

ML6984, ML7984 SERIES 4000 DIRECT COUPLED VALVE ACTUATORS
4
95C-10939—6
Assembly of MLx984 Actuator to the Valve:
1. The drive shaft of the MLx984 Actuator has a 1/4-28
UNF threaded hole to link with the valve stem. Slide
the yoke over the valve bonnet (Fig. 4).
2. Thread the MLx984 Actuator drive shaft onto the valve
stem all the way, until it is completely attached (with
no threads showing), by turning the valve actuator in a
clockwise direction, as viewed from above. Depending
on the valve body, use a pin or wrench to keep valve
stem from turning. Note that the valve actuator is
shipped with drive shaft in the mid-position.
3. Care should be exercised when using tools on the
valve stem during tightening (Fig. 4). DO NOT damage
the threads or other parts of the stem.
4. Orient the conduit hole to the most desirable direction,
then tighten the LOCKNUTS on the U-bolt.
5. Remove the plastic cover from the MLx984 by
loosening the two captive screws located on the top.
Drop the Allen (Hex) type of set screw (included in the
plastic bag) into the top of the shaft, hex side up.
6. Tighten the set screw to lock valve stem in place
(Fig. 6), using a 1/8 in. Allen wrench (included).
NOTE: Use U-bolt supplied with actuator. Do not replace
with stainless steel U-bolt on chilled water valves.
Condensation may cause cor ro sion of yoke with
SS U-bolt.
CAUTION
For proper valve operation, valve stem must be
threaded into the actuator all the way (with no
threads showing) and locked in place with the set
screw provided.
Fig. 4. U-bolt Assembly.
Fig. 5. Assembly of MLx984A to Valve.
Fig. 3. Preparation for Valve Assembly.
M25488
M25489
Yoke
U-boltValve Bonnet
DO NOT
1
2
1
2
THREAD ACTUATOR SHAFT TO VALVE STEM BY
ROTATING IN A CLOCKWISE DIRECTION.
TIGHTEN U-BOLT NUTS TO SECURE LINKAGE TO
VALVE BODY.
ADJUST
M25490
Valve Stem
5mm [3/16 in.] Slotted Screwdrive
r
or Allen Wrench
Linkage
Set Screw
Fig. 6. Locking MLx984A Drive Shaft to Valve Stem.
M25487
Valve Stem
Remove Stem Button
NOTE: DO NOT
DAMAGE ANY
PART OF
THE STEM.
Yoke
Position
Indicator
(Metal clip)
Valve Stem
ASSEMBLY OF POSITION INDICATOR
1
1
Position indicator will fit 1/4 in. - 7-1/16 in. valves.