Brochure

MK-71xx Series, MK4-71xx
Damper Actuators, Proportional
Model Chart
For proportional pneumatic actuator with 20 sq. in.
(129 cm
2
) effective area used to control damper
and air valves in heating, ventilating, and air
conditioning systems.
Features:
• Rugged cast aluminum body.
• Completely enclosed spring.
• Long lasting rolling diaphragms.
Model No.
Nominal
Operating
Range
Starting
Pressure
Adjustable
Maximum Force
a
a
Force and torques based on factory set stroke and starting pressure.
Nominal Torque
b
Proportional Control
a
b
Nominal torque for actuators without positioner is based on 1.5 psi (10 kPa) pressure change at the actuator. MK-7121 requires 15 psi (103 kPa) be
available to actuator.
Return
Stroke
Power Stroke
Based on
1.5 psi
Pressure
to Actuator
15 psi
Supply
Dual Press.
System
15 psi
Supply
Single
Press.
System
c
c
Adjust pressure reducing valve so that listed pressures are available at the actuator. MK4-7121 requires 20 psi (138 kPa) be available to actuator.
20 psi
Supply
Single or
Dual Press.
System
c
15 psi
Supply
Dual
Press.
System
15 psi
Supply
Single
Press.
System
c
20 psi
Supply
Single or
Dual
Press.
System
c
psig psig lb lb lb lb lb-in. lb-in. lb-in.
MK-7101
MK4-7101
3 to 8 3r5 30 110 140 240 67.5
67.5 67.5
MK-7121
8 to 13 8r0.5 130 10 40 140 22.5
MK4-7121
d
d
Factory installed positive positioner (AK-42309-500) start point adjustable 1 to 12 psi (7 to 83 kPa) with span adjustable 2 to 13 psi (14 to 90 kPa).
90 293
MK
-
71
x
Series
,
MK4-7
1
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