Schneider Electric AV-496 Data Sheet

Application

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

SPECIFICATIONS

Table-1 AV-496 Valve Linkage Component Selection.

Valve Body

2-1/2 to 4”

VB-9XXX

5 & 6”

VB-9XXX

Except VB-9323 series valves.

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

E-rings

Mounting

Bracket Bolts

1-1/4” long

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.

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.

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