Schneider Electric AV-495 Data Sheet

Page 1

APPLICATION

The AV-495 linkage is used to field install MK-68X1series of actuators 2-1/2" to 4" VB-9213, VB-9223 and VB-9313 Schneider Electric valve bodies. Table-1 provides a list of actuators and valves compatible with AV-495 and details resulting close-off pressure.

PRE-INSTALLATION

Inspection

Visually inspect the package for damage. If damaged, notify the appropriate carrier immediately. If undamaged, open the package and visually inspect the device for obvious defects. Return damaged or defective products.

AV-495

Valve Linkage

General Instructions

Required Installation Items

Tools (not provided):

• Appropriate wrenches for stem extensions, lock nuts and

mounting bolts.

Table-1 Restrictions on Maximum Ambient Temperature

For The Valve Actuator.

Max. Temperature in °F (°C)

of Media in the Valve Body

(Check Ratings of the Valve)

281 (138) 160 (71)

250 (121) 220 (104)

Max. Ambient Temperature in

°F (°C) of MK-6801, MK-6811

or MK-6821

INSTALLATION

Consult Table-1 to make sure the valve selected is compatible with AV-495 valve linkage and the actuator. Verify that the close-off pressure shown in Table-1 is adequate for the application. Verify that fluid temperature of the media in the valve versus the ambient temperature at the actuator do not exceed the ratings shown in Table-2.

Caution:

• Installer must be a qualified, experienced technician

• Avoid locations where excessive moisture, corrosive

fumes or vibration are 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.

• The actuators can be mounted in any position above the

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

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Table-2 Actuators and Valve Bodies That are Compatible with AV-495 and Resulting Close-off Pressure.

MK-6801 MK-6811 MK-6821

Valve Body Information

Close-Off Pressure (psi)

Supply Air Pressure (psig)

Valve Body Part

Number

Description

VB-9213-0-4-12 2-Way

VB-9213-0-4-13 Open 85 3 - 41 75 - 27 62 - 5 41

250 psi Globe

Screwed

VB-9213-0-5-12

VB-9213-0-5-13 Open 85 3 - 41 75 - 27 62 - 5 41

2-Way

125 lb. Flanged

Normal

Position

(Stem Up)

Size

(in.)

Open 65 2-1/2 - 60 110 - 40 91 - 9 60

Open 56 2-1/2 - 60 110 - 40 91 - 9 60

15 20 15 20 15 20

VB-9213-0-5-14 Open 145 4 - 22 41 - 14 33 - 2 22

VB-9223-0-4-12 2-Way

VB-9223-0-4-13 Closed 85 3 5 - - 19 - - 41 - -

250 psi Globe

Screwed

VB-9223-0-5-12

VB-9223-0-5-13 Closed 85 3 5 - - 19 - - 41 - -

2-Way

125 lb. Flanged

Closed 65 2-1/2 9 - - 30 - - 60 - -

Closed 56 2-1/2 9 - - 30 - - 60 - -

VB-9223-0-5-14 Closed 145 4 2 - - 10 - - 22 - -

VB-9313-0-4-12

3-Way Mixing

250 psi Globe

VB-9313-0-4-13

Screwed

VB-9313-0-5-12

VB-9313-0-5-13

3-Way Mixing

125 lb. Flanged

VB-9313-0-5-14

Close-off pressure for 3-way valves: SU is “A” port close-off and is based on pressure at “A” port minus pressure at “B” port. SD is “B” port close -off and is based on pressure at “B” port minus pressure at “A” port. SU = Stem up position of valve. SD = Stem down position of valve.

Flow B to

67 2-1/2 9 60 110 30 40 91 60 9 60

91 3 5 41 75 19 27 62 41 5 41

74 2-1/2 9 60 110 30 40 91 60 9 60

101 3 5 41 75 19 27 62 41 5 41

170 4 2 22 41 10 14 33 22 2 22

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To install AV-495 Valve Linkage on Current Style Valves (Valves that do not require removal of packing nut to mount the actuator)

Refer to Figure-1.

1. Mount the bracket on the valve body by removing the bracket nut, placing the bracket on the valve body and replacing and tightening the valve bracket nut.

Note: Position the bracket so that the wiring or piping of the actuator is convenient.

2. Thread the 1/2" lock nut well down onto the valve stem. Place the indicator plate on the valve stem. Thread the stem extension well down onto the valve stem.

3. Attach the actuator to bracket: MK-68X1 series actuator: Use the two (2) bolts provided to fasten the actuator to the mounting bracket.

4. Stem height adjustment. See Table-3.

5. Tighten the lock nut against the stem extension to make the stem extension secure to the stem.

6. Apply the OPEN/CLOSED decal - 1" scale length.

To Install AV-495 Valve Linkage on Obsolete Style Valves (Valves that require removal of packing nut to mount the actuator)

Refer to Figure-2.

Table-3 Stem Height Adjustment.

Val ve Ty p e

2-Way Normally

Open

2-Way Normally

Closed, 3-Way

Valve Body

Part Number

Series

VB-9213

VB-9223 VB-9313

Procedure to Adjust Stem Extension and Insert Connecting Pin

1. The actuator should be powered and manually positioned so that actuator piston shaft is fully extended.

2. The valve stem should be pushed completely down with the valve disc against the valve seat.

3. The stem extension should be turned until the hole in the stem extension aligns with hole in the actuator piston.

4. Turn the stem extension two full turns up into the actuator piston.

5. Manually position the actuator toward the retract position and insert connecting pin.

1. The actuator should be in its fully retract position (no power).

2. The valve stem should be pulled completely up with the valve disc against the top valve seat.

3. The stem extension should be turned until the hole in the stem extension aligns with hole in the actuator piston.

4. Turn the stem extension down two full turns away from the actuator piston.

5. Manually position the actuator toward the extend position and insert connecting pin.

Caution: Before the packing nut is removed, the system pressure on the valve must be reduced to 0 psig. If the packing nut is removed while there is pressure on the valve, the packing can blow out of the valve.

1. Mount the bracket on the valve body by removing the packing nut and the bracket nut, placing the bracket on the valve body and replacing and tightening the valve bracket nut and subsequently replacing the packing nut.

Note: Position the bracket so that the wiring or piping of the actuator is convenient.

2. Thread the 1/2" lock nut well down onto the valve stem. Place the indicator plate on the valve stem. Thread the stem extension well down onto the valve stem.

3. Attach the actuator to the bracket: MK-68X1 series actuator: Use the two (2) bolts provided to fasten the actuator to the mounting bracket.

4. Stem height adjustment: See Table-3.

5. Tighten the lock nut against the stem extension to make the stem extension secure to the stem.

6. Apply the OPEN/CLOSED decal - 1" scale length.

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On October 1st, 2009, TAC became the Buildings business of its parent company Schneider Electric. This document reflects the visual i d en tity of Schneider Electric, however there remains ref erences to TAC as a corporate brand in the b ody copy. As each docume nt is updated, the body copy will be changed to reflect app r opriat e

Figure-1 Valve Linkage Assembly for MK-68X1 Series of

Actuators with Current 2-1/2" to 4" VB-9XXX Valve Bodies.

Figure-2 Valve Linkage Assembly for MK-68X1 Series of

Actuators with Obsolete 2-1/2" to 4" VB-9XXX Valve Bodies.

corporate brand changes.

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-21665-8