Specifications

MK-2690
Pneumatic Valve Actuator
Model Chart
Specifications
Accessories
For proportional pneumatic control of 1/2 in. to 2 in.
VB-7XXX Series valves (subject to close-off
ratings) and 1/2 in. to 1-1/4 in. 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 No.
Nominal Spring Range
a
(Spring Color Code)
a
Nominal (no load) condition, spring ranges based on 1/2 in. (13 mm) maximum stroke, provided by AV-7400 linkage (order separately).
psig kPa
MK-2690
8 to 13 (Blue) 55 to 90
Inputs Compatible with Proportional pneumatic signal. Refer to Model Chart.
Start point Non-adjustable.
Air connections 1/8 in. FNPT located on side of housing.
Mechanical Outputs
Stroke 1/2 in. (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.
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).
Dimensions 3-9/16Hx5Wx2-1/4 D in. (90 x 127 x 57 mm).
Model No. Description
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 (includes parts for VB-7XXX and VB-9XXX valves).
AV-7400 Valve linkage for VB-7XXX valves only.
TOOL-95-1 Pneumatic calibration tool kit.
PNV-144-043 3 to 7 yellow spring.
PNV-145-044 5 to 10 black spring.
PNV-145-043 8 to 13 blue spring.
PNV-102-1 Diaphragm.
MK
-
2690
For proportional pneumatic control of 1/2 in. to 2 in.
2
VB-7XXX
S
eries valves
(
sub
j
ect to close-o
ff
ratings)