Pneumatic Actuators - continued Damper Actuators, Proportional
Description
For proportional pneumatic actuator with 11 sq. in. (71 cm²) effective area used to control damper and air valves in heating, ventilating, and air conditioning systems.
C Features • Rugged cast aluminum body.
• Special linkage permits easy adjustment of stroke to suit various applications.
• Hesitation and non-hesitation models available.
MK-44xx Series
starting pressure adjustable
item
nominal operating range psig
return stroke (psig)
Based on 1.5 psi pressure to actuator lb
MK-4401 MK-4411 MK-4421 MK-4451
MK-4461 3 to 8
5 to 10 8 to 13
3 to 6, 9 to 12
3 to 6, 11 to 17
MK4-44xx Series item
nominal operating range psig
3 ±1 5 ±1 8 ±1
3 to 6 3 to 6 8.25
19.25 35.75 8.25
8.25
15 psi supply Dual press. system lb
30.25 19.25 2.75 8.25
0 Maximum Force * power stroke
15 psi supply single press. system *** lb
38.5 27.5 11
16.5 0
20 psi supply single or Dual press. system *** lb
66 55
38.5 44
16.5 15 psi
supplyDual press.
system lb-in.
7.9 7.9 2.6 7.9
0
15 psi supply single press. system *** lb-in.
7.9 7.9 7.9 7.9
0
20 psi supply single or Dual press. system *** lb-in.
7.9 7.9 7.9 7.9
7.9 nominal torque ** proportional control *
starting pressure adjustable
return stroke
(psig)
Based on 1.5 psi pressure to actuator lb
MK4-4401**** MK4-4411****
3 to 8 5 to 10 MK4-4421**** 8 to 13
MK4-4461**** 3 to 6, 11 to 17
3 ±1 5 ±1 8 ±1
MK4-4451**** 3 to 6, 9 to 12 3 to 6 3 to 6
8.25
19.25 35.75 8.25 8.25
15 psi supply
Dual press. system lb
30.25 19.25 2.75 8.25 0
Maximum Force * power stroke
15 psi supply single press. system *** lb
38.5 27.5 11
16.5 0
20 psi supply single or Dual press. system *** lb
66 55
38.5 44
16.5
nominal torqueb ** proportional control * 15 psi
supplyDual press. system lb-in.
7.9 7.9 2.6 7.9 0
15 psi supply single press.
system *** lb-in.
7.9 7.9 7.9 7.9 0
20 psi supply single or Dual press. system *** lb-in.
7.9 7.9 7.9 7.9 7.9
* Force and torques on based on factory set stroke and starting pressure. ** Nominal torque for actuators is based on 1.5 psi (10 kPa) pressure change at the actuator. *** Adjust pressure reducing valve so that listed pressures are available at the actuator. MK-4421 requires that 15 psi (103 kPa) be available to actuator. MK-4461 requires that 20 psi (138 kPa) be available to actuator. **** Factory installed positive positioner (AK-42309-500) start point adjustable 2 to 10 psi with span adjustable 2 to 10 psi.
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