A multi-turn electric actuator, also known as a linear electric actuator or multi-turn linear actuator, is a type of actuator that is used to control the linear movement of valves or other devices that require multiple revolutions or turns to open or close. Unlike part turn electric actuators that provide rotational movement of approximately 90 degrees, multi-turn electric actuators are designed to deliver linear motion over an extended range.
Here are some key features and functions of multi-turn electric actuators:
1. Linear Movement: Multi-turn electric actuators convert electrical energy into linear mechanical motion. They are capable of extending or retracting a rod or spindle to move the valve or device in a linear direction. The actuator can perform multiple revolutions or turns to achieve the desired linear displacement.
2. Electric Operation: Similar to other electric actuators, multi-turn electric actuators are powered by electricity. They incorporate an electric motor and a control system to drive the linear movement of the actuator. The motor receives electrical signals to extend or retract the rod or spindle, allowing for precise positioning and control.
3. Control and Automation: Multi-turn electric actuators are often used in automated systems, where they can be integrated with control systems like programmable logic controllers (PLCs) or distributed control systems (DCS). This enables remote or automated control of valve operations, allowing for precise and timely adjustments of the linear movement.
4. Torque and Thrust Output: Multi-turn electric actuators are designed to generate significant thrust or force to move the valve or device along its linear path. The actuator's torque output determines its capability to overcome resistance and achieve the necessary thrust to open or close the valve.
5. Position Feedback: Many multi-turn electric actuators incorporate position feedback mechanisms, such as limit switches, potentiometers, or position sensors, to provide information about the actuator's current position. This feedback helps in monitoring and controlling the linear displacement accurately, ensuring proper functioning and system control.
6. Versatility: Multi-turn electric actuators are versatile and can be used with various types of valves, such as gate valves, globe valves, and sluice valves, among others. They find applications in industries such as water treatment, oil and gas, chemical processing, power generation, and wastewater treatment.
7. Compact Design: Multi-turn electric actuators are typically designed to be compact and space-efficient, allowing for easy installation and integration into valve assemblies or systems.
Multi-turn electric actuators provide a reliable and efficient means of automating and controlling linear valve operations in industrial processes. Their linear movement, precise control, and compatibility with various valves make them suitable for applications where extended linear motion is required, such as opening or closing gate valves or sluice valves.