In the actual production process, it is very important to choose the pneumatic actuator of the pneumatic valve correctly, because if the actuator is too large, the valve stem may be subjected to too much force, and if the actuator is too small, it cannot generate enough torque to fully operate the valve.
In general, the selection of pneumatic actuators needs to consider multiple factors, such as valve usage, usage temperature, operating frequency, management and differential pressure, and a transmission medium (lubrication, drying, mud, etc.). In the process of selecting a pneumatic actuator, the key points are as follows.
The operating panel has two electric devices with direct output without thrust:
1 thrust disc; the other is to configure a thrust disc, which converts the output torque into output thrust through the valve stem nut in the thrust disc.
2. Working torque: Select the main parameters of the valve electric device, and the output torque of the pneumatic actuator should be 1.2~1.5 times the working torque of the large valve.
3. Stem diameter up to multiple turns of rising stem valve: If the larger stem diameter allowed by the electric device cannot pass through the valve stem of the valve, it cannot be assembled into an electric valve. Therefore, the inner diameter of the hollow output shaft of the electric device must be larger than the outer diameter of the valve stem of the rising stem valve. For some rotary valves and dark stem valves in the multi-turn valve, although the channel of the stem diameter is not considered, the stem diameter and the size of the keyway should also be fully considered when selecting, so that they can work normally after assembly.
Like other types of actuators, pneumatic actuators share many common characteristics. At the same time, they also have their own special functions and play an important role in many industries. It can be said that in these industries, the reputation of pneumatic actuators is indispensable. Compared with other types of actuators, the pneumatic actuator has special functions, and it is because of these functional advantages that we choose it. So, what are the special functions of pneumatic actuators?
Features of the 180 Degree Pneumatic Actuator: Stainless Steel Pneumatic Actuator has positives and negatives. When the signal increases, the downward movement of the valve stem is called the positive effect, and vice versa; the movement speed of the pneumatic actuator is large, but as the load increases, the speed will slow down, and it has a good adjustment function. Stainless steel pneumatic actuators have many functions. They have many performance characteristics that outperform comparable drives. In addition to purchasing pneumatic ball valves, many buyers will also purchase pneumatic actuators by the way. The output force of the pneumatic actuator is related to the working pressure and has high reliability and stability. However, after the air supply is interrupted, the valve cannot be serviced. To maintain it, a holding valve must be added.
Of course, pneumatic actuators also have some disadvantages. For example, pneumatic actuators are inconvenient to realize segment control and program control, which can be realized after improvement. Today's pneumatic actuators are easy to service and maintain. Only need to do daily simple maintenance and have good adaptability to the environment.
