MK21 Electric Actuator
KUHNWAY ELECTRIC ACTUATOR
Description
MK21 is an electric actuator with 90-degree rotation function, designed for the automation control of small and medium-sized valves. The built-in over-torque protection device can automatically stop the action when the valve body encounters a jam during operation, effectively avoiding equipment damage caused by overload and improving system safety and durability.
The actuator can be equipped with a proportional controller to support precise adjustment of valve opening to meet the application requirements of high flow or pressure control accuracy. MK21 also supports on-site manual control and remote automation system integration, with diverse and flexible operation methods, which is easy to apply to various industrial control environments.
Applicable scenarios include water treatment systems, heating, ventilation and air conditioning (HVAC), process equipment, building automation, etc., with the advantages of compact structure, easy installation and high stability.
Specifications
1. Maximum torque : 68NM
2. Gear rario : 2360
3. Time for 90 ° : 22 sec
4. Motor power : 80 W
5. Manual gear ratio : 68
6. Weight : 7.5 kg
7. Control method :
• Basic type ON/OFF
• Modulating
8. Voltage :
• 110/220V single phase
Standard Components
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Watertight IP 65. (Optional : IP 66, IP 67, IP 68)
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Over torque protection switch.
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Mechanical position indicator, allows users to visually check the actuator's opening status.
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Hand wheel.
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Two limit switches.
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The motor is equipped with an internal thermal protection device.
Special notes for installation of electric actuators
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When mounting electric actuators with valves it is necessary of valves's shaft and mounting brackets, socket. vertical and same center to match the actuator's vertical and same center.
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After completing the final setting for adjusting travel stops ,be sure to seal the two adjusting travel stops by water proof glue.
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After completing wiring installation, be sure to seal the wiring connection hole by water proof glue after completing wiring installation.
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Do not use electric actuators in the vacuum's chamber.
Optional Features Description
Modulating Control Unit (MCU)
Actuator can be operated according to input signal and provide the output signal for indicator.
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Three input options : 4~20 mA、 1~5 VDC、 2~10 VDC
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Output : 4~20 mA
Local Control Unit (LCU)
Local control unit is waterproof including four buttons with LED indicators. When the main control switches to on-site control mode, the controller allows the actuator to be opened and closed via the control panel. Similarly, the main control mode can switch back to remote operation mode, enabling the actuator to be controlled via a remote controller.
The on-site controller is designed to effectively prevent misoperation or accidents, ensuring safe and reliable operation.
Bracket and Socket
The MK series electric actuators use UNC thread standard mounting holes. If the valve body follows the ISO5211 standard, ISO5211-compatible brackets and sockets are required. These components ensure efficient compatibility, stable connections, and improved system reliability and efficiency.
Other Components
A. Potentiometer (1kΩ)
Provides feedback signal to indicate the opening status
B. Auxiliary Microswitches (Dry Contact)
The standard model equips with the 1st & 2nd switches for fully-open and fully-closed. The option consists of the 3rd & 4th auxiliary switches which provide dry contacts for fully-open and fully-closed.
C. Heater
A space heater can increase the internal temperature and keep dry inside actuator to avoid the freezing lubricant and moisture causing actuator failure under low temperature or high humidity.
MK21 is a 90° electric actuator with built-in torque protection, optional modulating control, and flexible support for both local and remote operation.