For proportional pneumatic actuator with 20 sq. in. (129 cm²) effective area used to control damper and air valves in heating, ventilating, and air conditioning systems.
C
MK-71xx Series Damper Actuators, Proportional
- continued
Features
• Rugged cast aluminum body. • Completely enclosed spring. • Long lasting rolling diaphragms.
starting pressure adjustable
item
nominal operating range psig
return stroke (psig)
MK-7101 3 to 8 MK-7121 8 to 13
3 ±5 8 ±0.5
Based on 1.5 psi pressure to actuator lb
30 130
15 psi supply Dual press. system lb
110 10
Maximum Force * power stroke
15 psi supply single press. system *** lb
140 40
20 psi supply single or Dual press. system *** lb
240 140
nominal torque ** proportional control * 15 psi
supplyDual press. system lb-in.
67.5 22.5
15 psi supply single press.
system *** lb-in.
67.5 67.5
20 psi supply single or Dual press. system *** lb-in.
67.5 67.5
* Force and torques based on factory set stroke and starting pressure. ** 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. *** Adjust pressure reducing valve so that listed pressures are available at the actuator. MK4-7121 requires 20 psi (138 kPa) be available to actuator. **** 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).
MK4-71xx Series Damper Actuators, Proportional
starting pressure adjustable
item
nominal operating range psig
return stroke (psig)
MK4-7101 3 to 8 MK4-
7121****
* Force and torques based on factory set stroke and starting pressure. ** 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. *** Adjust pressure reducing valve so that listed pressures are available at the actuator. MK4-7121 requires 20 psi (138 kPa) be available to actuator. **** 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).
188 Get technical help from one of over 100 technical specialists. 3 ±5 8 to 13 8 ±0.5
Based on 1.5 psi pressure to actuator lb
30 130
15 psi supply Dual press. system lb
110 10
Maximum Force * power stroke
15 psi supply single press. system *** lb
140 40
20 psi supply single or Dual press. system *** lb
240 140
nominal torque ** proportional control * 15 psi
supplyDual press. system lb-in.
67.5 22.5
15 psi supply single press.
system *** lb-in.
67.5 90
20 psi supply single or Dual press. system *** lb-in.