Schneider Electric MK-4800 Series Installation Instructions

Application

The MK-4800 series pneumatic valve actuator has an

(71 cm2) effective diaphragm area and is used to

11 in control 1-1/2" to 2" VB-9XXX series valves.

Features

• Rugged, die-cast aluminum housing

• 11 in

(71 cm2) effective area

• Replaceable, beaded, molded neoprene diaphragm

Applicable Literature

MK-4800 Series

Pneumatic Valve Actuator

General Instructions

• Cross-Reference Guide F-23638

• Reference Manual F-21683

• Application Manual F-21335

• General Instructions Sheet F-23325, for Valve

Linkage AV-420

INSTALLATION

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C A U T I O N

Inspection

Requirements

Valve Mounting

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 damaged products.

• Piping diagrams

• Tools (not provided):

Appropriate screwdriver or wrench for field service

Appropriate pliers or equivalent to assemble the linkage kit

• Training: Installer must be a qualified, experienced technician

• Appropriate accessories and valve body

• 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).

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

Mount the actuator on a valve so that it 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 reatt of the actuator to the installed valve.

5. 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.

6. The actuator may be swiveled, on a valve, to align the air connection with the control piping.

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

8. For steam applications only, position the valve body at least at 45° from the vertical.

so the valve stem and actuator are

achment

Assembly Instructions

For instructions on the installation of the actuator on a valve bod y, using the AV-420 valve linkage assembly, refer to the AV-420 General Instructions F-23325.

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