Small and light, easy to disassemble and repair, and can be installed at any position. The structure is simple and compact, and the 90 degree rotary opening is fast. Small operating torque, light and labor-saving. The flow characteristics tend to be straight and the regulation performance is good. The sealing material is resistant to aging, corrosion and various media. It is widely used in water plant, power plant, steel plant, papermaking, chemical industry, diet and other systems for water drainage, as regulation and cut-off use. Moreover, it has the advantages of convenient energy use, fast signal transmission speed, long transmission distance, convenient centralized control, high sensitivity and accuracy, convenient coordination with electric regulating instruments, and simple installation and wiring. The disadvantages are complex structure, small thrust, higher average failure rate than pneumatic actuator, suitable for places with low explosion-proof requirements and lack of gas source.