Schneider Electric AV-420 Data Sheet

Application

The AV-400 valve linkage kit is used to field-install MK-4800 series pneumatic actuators to 1-1/2" and 2" VB-9XXX valve bodies.

Features

• Provides interface between MK-48X1 pneumatic

actuator

and 1-1/2" and 2" VB-9XXX valve bodies

Applicable Literature

AV - 4 2 0

Pneumatic Actuator Valve Linkage Kit

General Instructions

• Environmental Controls Cross-Reference Guide,

F-

23638

• Environmental Controls Reference Manual,

F-

21683

• Environmental Controls Application Manual,

F-

21335

• Pneumatic Product Catalog, F-27383

• General Instructions Sheet, F-23326, for Pneumatic

alve Actuator MK-4800 Series

SPECIFICATIONS

C A U T I O N

Required Components

INSTALLATION Inspection

Requirements

Location: NEMA Type 1. Actuator Mounting: In any upright position with actuator above the centerline of the valve

body.

The actuators and the valves must be purchased separately.

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.

• Tools (not provided):

Appropriate wrenches for stem extensions, locknuts, and mounting bolts

• Training:

Installer must be a qualified, experienced technician

• Disconnect the air supply before installation, to prevent equipment damage.

• Make all connections in accordance with the piping diagram, and national and local

codes.

• Do not exceed the ratings of the device(s).

• Do not install the actuator below the center line of the valve. For steam applications only,

mount the actuator above the valve body at 45° from vertical.

• Avoid locations where excessive moisture, corrosive fumes, or vibration is present.

Mounting

When mounting an actuator onto a valve, using the AV-420 linkage, be sure the installation conforms to the following, as applicable:

1. Install all two-way valves so that they close against the flow. An arrow on the valve body or tag indicates proper flow direction.

2. Always install three-way mixing valves with two inlets and one outlet.

3. Always install three-way diverting valves with one inlet and two outlets.

4. Allow sufficient room above the actuator valve assembly for removal and reattachment of the actuator to the installed valve.

5. When selecting a location, allow sufficient room for accessories and for service of the product.

6. The valve actuator is generally mounted in an upright position, above the center line of the valve body. Do not mount the valve actuator below the center line of the valve.

7. The actuator may be swiveled, on a valve, to align the air conne ction with the control piping.

8. The actuator can be removed from the valve without disturbing the spring setting.

9. For steam applications only, position the valve body so the valve stem and actuator are at least at 45° from the vertical.

10. Maintain proper flow direction when installing all globe and radiator-type valves. Flow direction is indicated by an arrow on the valve body or by information on the attached tag.

11. Actuators can be mounted in any upright position above the centerline of a valve body.

Assembly Instructions

N O T E

"X"

Stem Height

Dimension

(See Table-1)

Upper Hole

Lower Hole

Stem Extension

Locknut

Valve Stem

(Full Threads)

Valve Mounting Nut

Style A Valve Body

Packing Nut

The AV -420 linkage is required to assemble all MK-4800 series actuators to VB-9XXX series valve bodies. To install these parts, proceed as follows:

Refer to Table-1 to maintain the proper stem height during assembly.

Table-1 Valve Stem Height Dimensions.

Valve Assembly

2-Way Normally Open 2-5/8" (67 mm) Stem Down 3-3/4" (95 mm) Stem Down

2-Way Normally Closed

and 3-Way

Style A Valve Bodies Style B Valve Bodies

3-9/16" (91 mm) Stem Up 4-11/16" (119 mm) Stem Up

Stem Height Dimension ("X")

2-Way Normally Open Valves (Stem Down to Close)

Refer to Figure-1, Figure-2, Figure-3, Figure-4, Figure-5.

1. Push the valve stem down until the plug is seated.

2. Thread the locknut onto the valve stem.

3. See Figure-1 and Figure-2 to identify the valve as a Style A or Style B valve body , then proceed as follows:

a. On Style A valves, thread the stem extension onto the valve stem so that the height

of the center of the stem extension’s lower pin hole is 2-5/8" (67 mm) from the top of the packing nut.

b. On Style B valves, thread the stem extension onto the valve stem so that the height

of the center of the stem extension’s upper pin hole is 3-3/4" (95 mm) from the top of the machined bonnet ledge.

4. Lock the stem extension in position with the locknut.

5. On Style B valves only, thread the valve bonnet nut to the bottom of the valve bonnet.

Figure-1 Adjust Stem Extension for Style A Valve Bodies.

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