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139F-27855-10
7. VB-8/9000 Series
Actuators and Linkages
Specifications
Part
Number
Nominal Spring Range
a
Nominal Stroke Dimensions
For Use With
Valve Bodies
psig kPa i n. mm in. mm
MK- 8 811
5-10 34-69
1 25.4
11¾ high x
10½ wide x
10½ deep
298 high
x 267 wide
x 267 deep
VB-9313
2½ – 4”
MK-8911
2 50.8
12¾ high x
10½ wide x
10½ deep
324 high
x 267 wide
x 267 deep
VB-9313
5 & 6”
a -
Nominal (no load) spring ranges are based on maximum 1” (25.4 mm) or 2” (50.8 mm) stroke.
MK-88/8900 Actuator Specifications
Effective Area
100 sq. in. (645 cm
2
)
Construction
Housing: Die cast aluminum.
Diaphragms: Replaceable beaded molded neoprene.
Stroke
See table below.
Spring
Retracts actuator shaft and raises valve stem on loss of air pressure.
Nominal Range
See table below.
Starting Point
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Ambient
Temperature
Limits
Shipping: -40…220 °F (-40…104 °C).
Operating: -20…220 °F (-29…104 °C).
Air Connection
1/8” FNPT
Valve Linkage
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Valve Stroke
Position Indication
1/8” (3 mm) increments
Mounting
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position.
Dimensions
See table below.
Application
MK-8800 series actuators are used to control 2½”…4” VB-9000 series valves. MK-
8900 series actuators are used to control 5” and 6” VB-9000 series valves.
Accessories
AK-52309-500 Positive positioner with linkage
Tool-95 Pneumatic calibration tool kit
MK-88/8911 Pneumatic
SR Actuators
MK-8xxx
Series Actuator
with 3-Way Valve Assembly
7. VB-8/9000 Series
Actuators and Linkages