Scotch yoke pneumatic actuator is an actuator that uses compressed air to drive valve switch or regulate medium flow. It is also called pneumatic actuator or pneumatic device. It is commonly used with valves.

Pneumatic ball valve is an integrated automatic control valve composed of ball valve body and pneumatic actuator. The pneumatic actuator has a relatively fast execution speed and a relatively fast switching speed of 0.05 seconds per time, so it is also commonly called pneumatic quick shut-off ball valve. Pneumatic ball valves are usually equipped with various accessories, such as solenoid valves, air source handling tri-assemblies, limit switches, positioners, control boxes, etc., to achieve in-situ control and remote centralized control. Valve switches can be controlled in the control room without running to the site or high altitude and dangerous areas for manual control, which greatly saves human resources, time and safety. 。 However, in the daily application selection, there are often single-acting and double-acting pneumatic actuators. What is the difference? The German Ward WODE valve engineer gives the following detailed introduction to the users, hoping to help you choose the type.

Dual-acting pneumatic actuator:
Dual-acting pneumatic actuator is that when the valve is ventilated, the pneumatic actuator starts to turn and open the valve. When the valve is closed, the other side of the valve is ventilated to close. It is reset by the cylinder, and can only remain in position when the air source is lost. Simply speaking, when you give air, the pneumatic actuator starts to turn and open the valve. When the valve is closed, the other side needs air supply. Close! And the single function is to turn on the gas if you give it, and turn off automatically if you don't give it.
Dual-acting cylinder has no spring, so the cost is lower than that of single-acting pneumatic actuator.
Single-acting pneumatic actuator:
Single-acting pneumatic actuator opens the valve under ventilation and closes automatically without ventilation source. Single-acting pneumatic actuator restores automatically by spring. Generally, it is used more in dangerous conditions than figure to convey combustible gas or liquid. When the gas source is lost and an emergency occurs, single-acting pneumatic actuator can automatically reset and reduce the danger. To a lower level, dual-acting is generally not easy to reset.
Single-acting pneumatic actuators are generally divided into normal open type and normal closed type. Normally closed type: ventilation closed, air cut off; Normally closed type: ventilation open, air cut off.
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