In environmental protection, water conservancy, petrochemical, metallurgy, papermaking, electric power, aerospace, pipelines, industrial equipment, industrial processing and other fields need to use a large number of valves to control fluid movement. The drive device that controls the opening, closing or partial switching of the valve is usually called a valve actuator or a valve driver. As the terminal actuator of valve control, the reliability, controllability and function of the actuator will directly affect the success or failure of the adjustment and control results and the safety of the equipment, and restrict the improvement of the overall level of automation.
In environmental protection, water conservancy, petrochemical, metallurgy, papermaking, electric power, aerospace, pipelines, industrial equipment, industrial processing and other fields need to use a large number of valves to control fluid movement. The drive device that controls the opening, closing or partial switching of the valve is usually called a valve actuator or a valve driver. As the terminal actuator of valve control, the reliability, controllability and function of the actuator will directly affect the success or failure of the adjustment and control results and the safety of the equipment, and restrict the improvement of the overall level of automation.
Electric actuator
As the name implies, electric actuators are powered by electricity and use single-phase or three-phase motors to drive gears or worm gears to output linear or rotary motion. The electric actuator can output a relatively constant driving force, has strong anti-deviation ability, and has higher control accuracy than the pneumatic actuator. It can automatically maintain the position without the aid of other auxiliary systems.
Pneumatic actuator
The pneumatic actuator is powered by compressed air and has the characteristics of simple structure and convenient maintenance, but it is large in size and requires air source and air purification device; the actuator and adjustment mechanism of the pneumatic actuator are a unified whole, and the actuator has a film Type, piston type, fork type and rack and pinion type.
Hydraulic actuator
Ordinary hydraulic actuators are powered by high-pressure oil, with large load capacity and high adjustment accuracy, but they need to be equipped with a large independent oil supply equipment, and the maintenance workload is relatively large. Hydraulic actuator structure has blade structure, rack and pinion type, screw type actuator. All three have their own advantages and disadvantages.
