Schneider Electric MK-2690 Pneumatic Valve Actuator User Guide
Schneider Electric MK-2690 Pneumatic Valve Actuator is a versatile device designed for proportional pneumatic control of 1/2" to 1-1/4" VB-111 and VB-9xxx series valves. Its compact size with 6 in² effective area and rugged die-cast aluminum housing make it suitable for various applications. The replaceable beaded molded neoprene diaphragm ensures durability and ease of maintenance.
The actuator operates with a proportional pneumatic signal and features a non-adjustable start point. Its 1/8" FNPT air connections are conveniently located on the side of the housing. The actuator provides a mechanical stroke of 1/2" (12.6 mm) and is equipped with a spring that retracts the actuator shaft and raises the valve stem in case of air pressure loss.
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MK-2690
Pneumatic Valve Actuator
General Instructions
Application
For proportional pneumatic control of 1/2" to 1-1/4"
VB-111 and VB-9xxx series valves.
Features
• Compact size with 6 in.
2
(39 cm
2
) effective area.
• Rugged die cast aluminum housing.
• Replaceable beaded molded neoprene diaphragm.
Applicable Literature
• Environmental Controls Cross-Reference Guide
F-23638
• Environmental Controls Reference Manual
F-21683
• Environmental Controls Application Manual
F-21335
• AV-400 Valve Linkage — General Instructions
F-19073
Printed in U.S.A. 1/10
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SPECIFICATIONS
Actuator Inputs
Compatible With: Proportional pneumatic signal. See Table-1.
Start Point, Non-adjustable.
Air Connections: 1/8" FNPT located on side of housing.
Actuator Outputs
Mechanical:
Stroke, 1/2" (12.6 mm) nominal.
Environment
Ambient Temperature Limits:
Shipping, -40 to 220° F (-40 to 104° C).
Operating, -20 to 220° F (-29 to 104° C).
Humidity: 5 to 95% RH, non-condensing.
Location: NEMA Type 1 indoor only.
Maximum Air Pressure: 30 psig (207 kPa).
Spring: Retracts actuator shaft and raises valve stem on loss of air pressure.
Springs provided in AV-400 linkage (order separately).
Table-1 Spring Ranges.
Actuator
Part Number psig
Nominal Spring Range*
(Spring Color Code) kPa
MK-2690
3 to 7 (Yellow)
5 to 10 (Black)
21 to 48
34 to 69
8 to 13 (Blue) 55 to 90
*Nominal (no load) condition, spring ranges based on 1/2" (13 mm) maximum stroke, provided by AV-400 linkage
(order separarely).
ACCESSORIES
AK-42309-500 Positive positioner and linkage; use with MK-2690-0-0-1 or MK-2690-0-0-2 models only
AV-400 Valve linkage
TOOLS
TOOL-95-1 Pneumatic calibration tool kit
MAINTENANCE PARTS
PNV-102 Diaphragm
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INSTALLATION
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 damaged products.
•
Job piping diagrams
•
Tools (not provided):
1-5/8" open-ended wrench
Appropriate screwdriver
•
Training: Installer must be a qualified, experienced technician
CAUTION:
•
Make all connections in accordance with the piping diagram.
•
Do not exceed ratings of the device(s).
•
Avoid locations where excessive moisture, corrosive fumes, or vibration is present.
The MK-2690 is generally installed in an upright position. When connecting to the control air line the actuator may be swiveled to any convenient position above the center line of the valve body.
N O T E
The actuator should be removed from the valve body during valve installation.
Installing Actuator on Valve Body
1. Position actuator assembly over valve stem and spring and secure with mounting nut.
2. Swivel actuator to convenient position for piping.
3. Connect air supply to actuator.
For information on valve linkage assembly, see General Instructions for AV-400 linkage
(F-19073).
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Mounting Nut
Figure-1 Actuator Assembled to Valve Body with Linkage.
Removing Actuator from Valve Body
1. Loosen mounting nut. (See Figure-1.)
2. Lift actuator straight up until it clears the valve spring.
N O T E
When removing the actuator, make sure that the piston is not pulled out of the diaphragm.
3. Lay the actuator on its top until it is to be installed.
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3
MAINTENANCE
FIELD REPAIR
Regular maintenance of the total system is recommended to assure sustained optimum performance.
Replacing Actuator Diaphragm
1. Disconnect air supply to actuator.
2. Loosen mounting nut. (See Figure-3.)
3. Lift the actuator off the valve body and linkage.
4. Place actuator on its top, and remove two (2) lower housing screws. Remove lower housing.
5. Remove piston from actuator.
6. Turn actuator housing over and remove the diaphragm retaining screws.
7. Remove diaphragm and its retainer from actuator housing by pulling them straight out
from housing. (See Figure-2 and Figure-3.)
8. Remove diaphragm retainer from old diaphragm and install new diaphragm.
9. Place diaphragm and retainer in housing and secure with two screws.
10. Place the actuator housing on its top (open side up) and center the piston on the dia-
11. Pull protrusions on diaphragm through mating holes on piston. (See Figure-2.)
12. Push the piston down evenly, rolling diaphragm around piston. Be certain to position the piston squarely on diaphragm with equal distances from piston to housing sides. (See
13. Install lower housing to the actuator housing with two retaining screws.
14. The actuator is now assembled. (See Figure-1.)
15. Install actuator on valve body.
Actuator
Housing
Piston
Diaphragm
Diaphragm evenly positioned around piston
Diaphragm
Retainer
Diaphragm Retainer Screws
Figure-2 Positioning Piston in Diaphragm
(shown with actuator in the inverted position).
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Diaphragm
Retainer Screws
Actuator
Housing
Diaphragm
Retainer
Diaphragm
Piston
Lower
Housing
Valve Body
Lower Housing
Screws
Mounting Nut
Figure-3 Exploded View of MK-2690.
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5
DIMENSIONAL DATA
All dimensions in inches (millimeters in brackets). See Figure-4.
Top View
2-1/4
(57)
5 (127)
Side View
Figure-4 MK-2690 Pneumatic Actuator.
3-9/16
(90)
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© Copyright 2010 Schneider Electric All Rights Reserved.
7
On October 1st, 2009, TAC became the Buildings business of its parent company Schneider Electric. This document reflects the visual identity of Schneider Electric, however there remains references to TAC as a corporate brand in the body copy. As each document is updated, the body copy will be changed to reflect appropriate 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.
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Schneider Electric
1354 Clifford Avenue
P.O. Box 2940
Loves Park, IL 61132-2940 www.schneider-electric.com/buildings
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