Application
CLOSED OPEN
CLOSED OPEN
The AV-496 valve linkage kit is used to field assemble
MK-88XX and MK-89XX series actuators to 2½ inch
through 6 inch VB-9XXX series valve bodies, except
VB-9323.
Features
• Die cast aluminum mounting bracket.
• Valve position indication provided as standard.
AV-496
Valve Linkage for MK-88XX
and MK-89XX Actuators
General Instructions
Applicable Literature
• Cross-Reference Guide, F-23638
• Reference Manual, F-21683
• Application Manual,F-21335
• Pneumatic Products Catalog, F-27383
• AK-42309-500 Positive Positioner Pneumatic Relay
Gene
ral Instructions, F-22909
• EN-205 Water System Guidelines, F-26080
Printed in U.S.A. 6-10 © Copyright 2010 Schneider Electric All Rights Reserved. F-21663-5
SPECIFICATIONS
Table-1 AV-496 Valve Linkage Component Selection.
Valve Body
2-1/2 to 4”
VB-9XXX
5 & 6”
VB-9XXX
a
Except VB-9323 series valves.
a
Actuator Lock Nut Spacers Stem Adapters
MK-88XX 1/2” —
MK-89XX 1/2” 2
2 for
1/2” stem
2 for
1/2” stem
Stem
Link
Shaft
1 2
1 2
E-rings
Mounting
Bracket Bolts
2
1-1/4” long
2
2-1/4” long
Indicating
Plate
1 with
1/2” hole
1 with
1/2” hole
Scale
Length
1”
(25.4mm)
2”
(50.8mm)
INSTALLATION
Inspection Inspect the package for damage. If damaged, notify the appropriate carrier immediately. If
undamaged, open the package and inspect the device for obvious damage. Return any
damaged products.
Requirements • Tools:
– Open end wrench, 3/4 inch
– Slotted screw driver
– Scale for measuring the gap between valve stem and actuator shaft
• Training: Installer must be a qualified, experienced technician
Caution:
• Avoid locations where excessive moisture, corrosive fumes, or vibration is present.
• Install all two-way valves so that they close against the flow. An arrow on the valve body
or a tag indicates the proper flow direction.
• Always install three-way mixing valves with two inlets and one outlet.
• Do not install the actuator below the center line of the valve. For steam applications
mount the actuator above the valve body at 45° from vertical.
2 © Copyright 2010 Schneider Electric All Rights Reserved. F-21663-5
Linkage Kit Installation
Two-way Normally Open VB-9213 2½” through 6” Valve Bodies
Warning: 2½” through 6” valve bodies date coded before 8603 must have valve packing
nut removed and replaced [replace packing nut — tighten four (4) turns] along with the
bracket nut. Before removing packing nut, isolate the valve body using shutoff valves or
depressurize system to zero gauge and drain piping. System pressure could cause packing
parts to blow out with potential of bodily injury and/or water damage.
1. Push the valve stem completely down.
2. Remove bracket nut from valve body. Refer to Figure-1.
3. Place mounting bracket onto valve body and secure it in place with the bracket nut.
4. Thread the stem lock nut all the way down the valve stem.
5. Place the indicator plate on the valve stem.
6. Install an E-ring on one end of stem link shaft (pin). Insert the pin through the holes of the valve stem adapter.
7. Thread the valve stem adapter onto the valve stem until the stem touches the pin. Back
the adapter off ½ turn (counterclockwise) and remove the pin.
8. Secure the valve stem adapter, the AK-42309-500 spring arm (if required), and the
indicator plate into place with the stem lock nut. Refer to
Note: For actuator/valve assemblies that require a positive positioner, refer to
AK-42309-500, Positive Positioner Pneumatic Relay General Instructions, F-22909,
for details.
Figure-1.
9. Select the actuator (MK-88XX or MK-89XX series). For actuators details refer to
MK-8800 Series, MK-8900 Series, Pneumatic Valve Actuators General
Instructions, F-21662.
10. Thread actuator shaft adapter onto the actuator shaft as far as it will turn. Refer to Table-1 for required AV-496 components.
1 1. Using the appropriate bolts attach the selected actuator to the mounting bracket. Refer
Table-1. If MK-89XX series actuator is selected, install the spacers before attaching
to
the actuator to the bracket. Refer to Figure-1.
12. Turn actuator shaft adapter (counterclockwise) until the distance between the surface
of the two adapters is 1.100” (for 5” and 6” valves with 2” stroke) or 0.100” (for 2-1/2” to
4” valves with 1” stroke). Use a scale or caliper to measure the distance.
13. Raise the valve stem to slide the valve stem adapter into the actuator shaft adapter.
14. Align the holes on both sides of the adapter assembly.
15. Insert the stem link shaft (pin) through the holes and place the second E-ring on the other end to secure the assembly.
16. Align the top indication marker of the OPEN/CLOSE decal with the indicator plate. Affix
the OPEN/CLOSE decal to the mounting bracket. Refer to
17. Linkage assembly is complete. Refer to Figure-2 and Figure-3.
Figure-1.
F-21663-5 © Copyright 2010 Schneider Electric All Rights Reserved. 3
Actuator Piston*
Stem
Vertical View of
Actuator Shaft Adapter
Spacer (2) for
MK-89XX Series
Actuators Only
Valve
Stem
Adaptor
Indicator
Plate
Mounting Bolt (2)
for MK-8900 Series
Stem
Lock Nut
Mounting
Bracket
E-Ring (2)
Stem Link Shaft
Mounting Bolt (2)
for MK-8800 Series
CLOSED
OPEN
OPEN
CLOSED
Decal
*Packing Nut
*Bracket Nut
*Valve Body
*Not Included with AV-496.
Actuator Shaft
Adapter
4 © Copyright 2010 Schneider Electric All Rights Reserved. F-21663-5
Figure-1 AV-496 Valve Linkage Kit Components.
Linkage Kit Installation (Continued)
Two-way Normally Closed VB-9223 2½” through 6” and
Three-way Mixing VB-9313 2½” through 6” Valves Bodies
Warning: 2½” through 6” valve bodies date coded before 8603 must have valve packing
nut removed and replaced [replace packing nut — tighten four (4) turns] along with the
bracket nut. Before removing packing nut, isolate the valve body using shutoff valves or
depressurize system to zero gauge and drain piping. System pressure could cause packing
parts to blow out with potential of bodily injury and/or water damage.
1. Push the stem completely down.
2. Remove the bracket nut from valve body. Refer to Figure-1.
3. Place the mounting bracket onto the valve body and secure it in place with the bracket nut.
4. Thread the stem lock nut all the way down the valve stem.
5. Place the indicator plate on the valve stem.
6. Install an E-ring on one end of the stem link shaft (pin). Insert the pin through the hole on the valve stem adapter.
7. Thread the valve stem adapter onto the valve stem until the stem touches the pin. Back
the adapter off ½ turn (counterclockwise) and remove the pin.
8. Secure the valve stem adapter, the AK-42309-500 spring arm (if required), and the
indicator plate into place with the stem lock nut. Refer to
Note: For actuator/valve assemblies that require a positive positioner, refer to
AK-42309-500, Positive Positioner Pneumatic Relay General Instructions, F-22909,
for details.
Figure-1.
9. Select the actuator (MK-88XX or MK-89XX series). For actuators details refer to
MK-8800 Series, MK-8900 Series, Pneumatic Valve Actuators General
Instructions, F-21662.
10. Thread the actuator shaft adapter onto the actuator stem as far as it will turn. Refer to Table-1 for required AV-496 components.
1 1. Using the appropriate bolts attach the selected actuator to the mounting bracket. Refer
to Table-1. If MK-89XX series actuator is selected install the spacers before attaching
the actuator to the bracket. Refer to Figure-1.
12. Raise the valve stem completely up, so that the disc rest against the top seat.
13. Turn the actuator shaft adapter counterclockwise until the holes on the adapters are aligned.
14. Screw the actuator shaft adapter 1½ turns further clockwise onto the actuator shaft.
15. Apply air pressure to actuator until the holes on the adapters are aligned.
16. Insert the stem link shaft (pin) through the holes and place the second E-ring on the other end to secure the assembly.
17. Release pressure to actuator and allow valve assembly to spring return to the closed position.
18. Align the top indication marker of the OPEN/CLOSE decal with the indicator plate. Affix
the OPEN/CLOSE decal to the mounting bracket. Refer to
19. Linkage assembly is complete. Refer to Figure-2 and Figure-3.
Figure-1.
MAINTENANCE The actuator linkage requires no maintenance. Regular maintenance of the total system is
recommended to assure sustained optimum performance. Hard water leaves abrasive
deposits and reduces component life. T o maximize valve life, consult EN-205 Water System
Guidelines, F-26080.
F-21663-5 © Copyright 2010 Schneider Electric All Rights Reserved. 5
Figure-2 MK-8800 Series Actuator Valve Assembly.
Figure-3 MK-8900 Series Actuator Valve Assembly.
6 © Copyright 2010 Schneider Electric All Rights Reserved. F-21663-5
F-21663-5 © Copyright 2010 Schneider Electric All Rights Reserved. 7
On Oc tober 1st, 2009, TAC bec am e the Bui ldings bus iness of its parent company Schneider Electr ic. This docum ent r eflects the visual ident ity of Schneider El ectric,
ho wever there rem ains referenc es to TAC as a corporat e brand in the body c opy. As e ach document is updated, the body copy will be changed to reflect appropriate
corpo rate br a nd ch a nges.
Copyright 2010, Schneider Electric
All brand names, trademarks and registered
trademarks are the property of their respective
owners. Information contained within this
document is subject to change without notice.
F-21663-5
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