Our actuators are divided into the pneumatic diaphram actuator and pneumatic piston actuator. The pneumatic diaphragm actuator is designed by one-stroke. However, the Pneumatic piston actuator is designed by one-stroke and two-stroke.

Among them, the one stroke pneumatic diaphragm actuator and the one stroke pneumatic piston actuator is mainly installed on the surface safety valve, used as the control mechanism of the main valve. The design is simple, reliable, easy to disassembly without the use of special tools and easy maintenance.

2, Composition and Structure

It is mainly composed of the cylinder, piston (diaphragm), upper and lower cylinder cover, springs, seals and pressure relief devices and so on.

3, Design Standards
GB 150

4, Working Principle
1) The working principle of diaphragm pneumatic actuator:
The pressure compresses the diaphragm and spring downward to drive the open or close of the gate. When the pressure disappears, the spring automatically reset back to the normal position.

2) The working principle of one-stroke piston pneumatic actuator

The pressure compresses the piston and spring downward to drive the open or close of the gate. When the pressure disappears, the spring automatically reset back to the normal position.

3) The working principle of two-stroke piston pneumatic actuator

The pressure compresses the piston and spring downward to drive the open or close of the gate. When you want to close or open the valve, the pressure goes into the lower piston through the selector valve and then drive the close or open of the gate.