User Guide
Table Of Contents
- Application
- Features
- Applicable Literature
- 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.
- 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.
- The actuator should be removed from the valve body during valve installation.
- For information on valve linkage assembly, see General Instructions for AV-400 linkage (F-19073).
- When removing the actuator, make sure that the piston is not pulled out of the diaphragm.
- Regular maintenance of the total system is recommended to assure sustained optimum performance.
- 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 diaphragm. (See Figure-2.)
- 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 Figure-2.)
- 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.
- Figure-2 Positioning Piston in Diaphragm (shown with actuator in the inverted position).
- Figure-3 Exploded View of MK-2690.
- 1. Disconnect air supply to actuator.
- All dimensions in inches (millimeters in brackets). See Figure-4.
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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.
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
Actuator
Part Number
Nominal Spring Range*
(Spring Color Code)
psig kPa
MK-2690
3 to 7 (Yellow) 21 to 48
5 to 10 (Black) 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).