With the development of detection and control technology, pneumatic valve actuators have been widely used in all walks of life, which can realize remote automatic control of valves and improve the intelligent level of pipe network.

Pneumatic valve actuators use compressed air to drive the valve to open and close. It adopts a piston-rack-gear transmission structure, when the air enters, the piston drives the rack to rotate, thus driving the valve stem to complete the switch. The valve actuator has two working modes: two-way action and one-way action. When the two-way action, the air enters back and forth to realize the full opening and full closing of the valve; One-way operation, the use of spring reset, air one-way drive can be completed to open or close.

When selecting the valve actuator, the model specification should be determined according to the torsion torque required by the valve, and a certain safety margin should be considered. In addition, different working pressures and ambient temperatures will also affect the choice of products. Under normal circumstances, 0.4-0.7MPa compressed air can meet the working requirements of the actuator.

The use of pneumatic valve actuators instead of manual operation can not only achieve remote control and automatic control of the valve, but also avoid the risks caused by improper human operation. It has the advantages of strong practicability and precise control, and is worth popularizing and applying in pipeline system.