The multi-turn electric actuator drives the screw or rotating mechanism through an electric motor, combined with a reduction device and a closed-loop control system, to convert electrical energy into multi-turn rotary motion, achieving precise control of the valve.
I. Core Principles
1. Electrical energy conversion and drive
① The motor (single-phase/three-phase) serves as the power source. Through the reducer, the high-speed and low-torque output is converted into low-speed and high-torque output to drive the screw or rotating mechanism.
② The rotary motion of the screw drives the piston or transmission components, converting into multi-turn rotational actions (usually over 360°), which is suitable for valves that require multiple rotations to open and close (such as plug valves, gate valves, etc.).
2. Closed-loop control and feedback regulation
① Built-in position sensors (such as encoders and limit switches) are installed to monitor the actual position of the actuator in real time and compare it with the set value.
② The motor's operating state is adjusted through the controller to achieve precise positioning and dynamic regulation, with an error usually within ±1°.
① The motor (single-phase/three-phase) serves as the power source. Through the reducer, the high-speed and low-torque output is converted into low-speed and high-torque output to drive the screw or rotating mechanism.
② The rotary motion of the screw drives the piston or transmission components, converting into multi-turn rotational actions (usually over 360°), which is suitable for valves that require multiple rotations to open and close (such as plug valves, gate valves, etc.).
2. Closed-loop control and feedback regulation
① Built-in position sensors (such as encoders and limit switches) are installed to monitor the actual position of the actuator in real time and compare it with the set value.
② The motor's operating state is adjusted through the controller to achieve precise positioning and dynamic regulation, with an error usually within ±1°.
Ⅱ、Application and Characteristics
1. Typical application scenarios of : control of valves that require multiple turns of operation, such as plug valves in petrochemical pipelines, gate valves in water treatment systems, and control valves in the power industry.
2. Key advantage :
① Stability : The deceleration mechanism ensures a constant rotational speed, avoids mechanical shock, and extends the service life of the equipment.
② Safety : The torque protection device can automatically correct abnormal torque Settings to prevent overload damage.
③ Intelligence : Supports remote communication interfaces (such as HART protocol) to achieve integrated control with PLC/DCS systems.
2. Key advantage :
① Stability : The deceleration mechanism ensures a constant rotational speed, avoids mechanical shock, and extends the service life of the equipment.
② Safety : The torque protection device can automatically correct abnormal torque Settings to prevent overload damage.
③ Intelligence : Supports remote communication interfaces (such as HART protocol) to achieve integrated control with PLC/DCS systems.