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91F-27855-10
4. VB-7000 Globe Valves
Actuators & Linkages
4. VB-7000 Series Globe Valves
Actuators & Linkages
MK-2690 Pneumatic Valve
Actuator - Proportional
MK-2690 Proportional
Pneumatic Valve Actuator
Application
The MK-2690 provides proportional pneumatic control of ½"…2" VB-7000 Series
valves (subject to close-off ratings) and discontinued ½"…1¼" VB-9xxx valves.
Features
• Compact size with 6 in
2
(39 cm
2
) effective area
• Rugged die cast aluminum housing
• Replaceable beaded, molded, neoprene diaphragm
Model Table
Model Number
Nominal Spring Range
a
(Spring Color Code)
psig kPa
MK-2690
3…7 (Yellow) 21…48
5…10 (Black) 34…69
8…13 (Blue) 55…90
a - Nominal (no load) condition, spring ranges based on ½" (13 mm) maximum stroke, provided
by AV-7400 linkage (order separately).
Specifications
Inputs
Compatible with proportional pneumatic signal. Refer to Model Table.
Start Point

Air Connections
1/8" FNPT located on side of housing.
Max. Air Pressure
30 psig (207 kPa)
Mechanical Outputs
Stroke
5/8" available
Environment
Ambient
Temperature Limits
Shipping: -40…220° F (-40…104° C)
Operating: -20…220° F (-29…104° C)
Humidity
5…95% RH, non-condensing
Spring
Stainless steel spring retracts actuator shaft and raises valve stem on loss of air pressure. Springs

Dimensions
3-9/16" H x 5" W x 2¼" D (90 x 127 x 57 mm)
Accessories
Valve Linkages
AK-42309-500

AV- 400
Valve linkage (includes parts for VB-7000 and VB-9xxx valves and 3…7, 5…10, & 8…13 springs)
AV-7400

TOOLS
(factory-available)
TOOL-095-1
Pneumatic calibration tool kit.
Maintenance Parts
PNV-144- 43
3…7 psig spring
PNV-145-45
5…10 psig spring
PNV-145-48
8…13 psig spring
PNV-102-1
Diaphragm