Pneumatic valve actuator failure resolution will choose a more suitable pneumatic actuator, high cost-effective pneumatic actuator, then we must first understand the types of actuators, actuators can be divided into pneumatic actuator and electric actuator, the more commonly used actuators are the two, we will choose pneumatic actuator when buying.

Then we have to choose the actuator according to the size of the air source. The torque needed to rotate the valve can not be changed, and the life of the valve is not long if it is too big. Typically, a 30% allowance for torque is OK. Pneumatic actuator can be seen from the text that this kind of actuator is operated by air pressure. Compared with the electric actuator, it can adapt to more environments, and its load force is greater with reasonable structure, thus achieving the goal of high torque output. At the same time, compared with the electric actuator, the action is faster and the response is faster. Of course, electric actuators also have many advantages that pneumatic actuators can not match, and the advantages of pneumatic actuators are also what current electric actuators do not have, both of which have their own shortcomings and advantages. Therefore, under the continuous development of science and technology in the future, the performance-price ratio of the two will be greatly improved.

Secondly, we evaluate the installed platform, and each environment chooses actuators. There is a standard for the actuators. It is not wrong for us to find the corresponding standard according to the valve. As a pneumatic actuator, in fact, its function in the valve is to make the valve device more convenient in use. Because the pneumatic actuator is connected, the valve can drive the rapid linkage of valve body parts when it is running in the pipeline, which has certain automation effect. Moreover, because the actuator itself is energy-driven, it has certain value for the drive of valve body opening and closing parts. This kind of valve is used in the fluid pipeline to open and close because of the small fluid resistance.

Common faults are valve body inactivity, valve can not close to zero, pneumatic actuator without feedback signal, signal pressure instability, etc. There are also some special faults, such as pneumatic actuator control valve vibration. Next, we mainly analyze the causes of the vibration of the special fault control valve and the treatment measures.

Troubleshooting of pneumatic valve actuator

The vibration of the pneumatic actuator control valve will cause the control system to fail to work properly. The main reasons for the vibration are as follows:

1. External vibration source, that is, the pipeline itself has vibration.

2. The selection of pneumatic actuator control valves does not meet the requirements of selection, such as inappropriate flow characteristics, large valve caliber, poor spring stiffness and so on, resulting in vibration of control valves.

3. Vibration due to fluid erosion.

Pneumatic valve actuator troubleshooting measures: If it is found that there is vibration in the equipment pipeline itself, the equipment pipeline can be cleaned and readjusted to make the vibration disappear. If the pneumatic actuator control valve itself is a problem, the orifice plate can be used to absorb part of the pressure drop, reduce the throttle speed and overcome the valve vibration. The orifice plate can also change the inherent frequency of the system to avoid the vibration caused by the natural frequency of the control valve close to the natural frequency of the system.