Schneider Electric AV-7400 Data Sheet

Application

The AV-7400 valve linkage kit is used to field assemble MK-2690 pneumatic actuators to 1/2" through 2" VB-7XXX series valve bodies.

Features

• Springs are provided for all control signal

applications, including 3 to 7, 5 to 10, and 8

to 13 psig.

AV-7400

Pneumatic Actuator Valve Linkage Kit

for VB-7XXX Series Valves

General Instructions

• Kit fits all VB-7XXX series valve bodies.

Applicable Literature

• Schneider Electric Environmental Controls Cross-

Reference Guide, F-23638

• Schneider Electric Environmental Controls

Reference Manual, F-21683

• Schneider Electric Environmental Controls

Application Manual, F-21335

• Pneumatic Products Catalog, F-27383

• MK-2690 Pneumatic Valve Actuator General

Instructions, F-13893

• Schneider Electric Environmental Controls Valve

Selection Guide, F-26094

• EN-205 Water System Guidelines, F-26080



INSTALLATION



C A U T I O N



C A U T I O N

Figure-1 Installation of Hexagon Coupler and Spring Compression Screw onto Valve Stem.

Spring Compresion Screw

Hexagon Coupler

Valve Stem

1/16" (1.6 mm)

Max.

Inspection

Requirements

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 any damaged products.

• Tools:

– Screwdriver appropriate for slotted spring compression screw (not provided) – Linkage wrench (provided) or TOOL-20-1, packing and linkage wrench (not provided)

• Training: Installer must be a qualified, experienced technician

• Avoid locations where excessive moisture, corrosive fumes, or vibration are present. Do not

insulate piping above the actuator mounting nut preventing proper drainage.

• 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.

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

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

the actuators above the valve body at 45° from vertical.

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

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

3. 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.

Linkage Kit Installation

The AV-7400 linkage kit used with the MK-2690 actuator on VB-7XXX series valve bodies requires no stem height setting. Refer to the Schneider Electric Environmental Controls Valve Selection Guide, F-26094, for valves accommodating the MK-2690 actuator.

It is essential that the proper parts be used for the valve body on which the linkage is being installed to ensure proper actuator operation and close off.

Procedure



C A U T I O N

Figure-2 Assembly of AV-7400 Linkage Kit onto VB-7XXX Series Valve.

Spring Retainer

Spring

Mounting Nut

Packing Nut

Spring

Compression

Screw

Hexagon Coupler

The linkage is assembled onto the VB-7XXX valve body with stem in the up position.

1. Thread the hexagon coupler onto the valve stem all the way to the bottom of the stem thread until it is finger-tight (Figure-1).

The hexagon coupler must reach to within 1/16" (1.6 mm) of the smooth section of the stem to assure proper seating.

2. Start the spring compression screw one turn or more into the hexagon coupler. Pull the valve stem completely up (

Figure-2).

3. Choose the correct spring for the desired actuator operating pressure range:

• Yellow spring — 3 to 7 psig (21 to 48 kPa)

• Black spring — 5 to 10 psig (34 to 68 kPa)

• Blue spring — 8 to 13 psig (55 to 89 kPa)

4. Slip the spring over the coupler and the spring compression screw.

5. Place the retainer over the screw. Twist the retainer 45° to lock it in place on the spring compression screw.

6. Insert the linkage wrench (supplied with kit, also included on TOOL-20-1) through the spring coils to hold the hexagon coupler.

7. Tighten the spring compression screw. To establish proper linkage height, run the spring compression screw down until the screw end bottoms firmly on the stem top (Figure-3).

• On stem up closed valves (VB-722X) or three-way valves (VB-73XX), you can feel

the screw bottom.

• On stem up open valves (VB-721X), the stem and hexagon coupler begin to turn.

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