Pneumatic valve actuator failure resolution will choose a more suitable pneumatic actuator, pneumatic actuator with higher cost performance, so first of all, we need to understand the type of actuator, the actuator can be divided into pneumatic actuator and electric actuator, the more commonly used actuator is these two kinds, we will choose pneumatic actuator when purchasing.


Then we have to choose the actuator according to the size of the air source. The torque required to rotate the valve is not understood, and the service life of too large valve is not long. Generally, it is OK to leave a margin of 30% for the torque. Pneumatic actuator can be seen from the text that this kind of actuator is operated by pneumatic force. Compared with the electric actuator, it can adapt to more environment, reasonable structure makes its load force larger, and achieves 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, the electric actuator also has many advantages that the pneumatic actuator can't compare with. The advantages of the pneumatic actuator are also what the current electric actuator doesn't have. Both of them have their own shortcomings and advantages. Therefore, in the future, with the continuous development of science and technology, the cost performance of the two will be greatly improved.


Secondly, we evaluate the installed platform, and select actuators for each environment. There is a standard for actuators. If we want to find the corresponding standard according to the valve, we will not be wrong. As a kind of pneumatic actuator, its function in the valve is to make the valve device more convenient in use. Because of the pneumatic actuator's access, this kind of valve can drive the quick linkage of the valve body parts when it operates in the pipeline, which has a certain degree of automation effect. Moreover, because the actuator itself is energy driven, it also has a certain value for the drive of the valve body opening and closing parts. The valve is used to open and close the fluid pipeline due to the small fluid resistance.


Common faults include valve body does not act, valve cannot be closed to zero position, pneumatic actuator has no feedback signal, signal pressure is not stable, etc. There are also some special faults, such as the vibration of pneumatic actuator control valve. Next, we mainly analyze the cause of vibration of special fault control valve and the treatment measures.


Trouble shooting of pneumatic valve actuator


The vibration of the control valve of the pneumatic actuator will cause the control system to fail to work normally. There are three main reasons for the vibration:


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


2. The selection of control valve of pneumatic actuator does not meet the requirements of selection, such as unsuitable flow characteristics, large valve diameter, poor spring stiffness, etc., resulting in control valve vibration.


3. It is eroded by fluid to produce vibration.


Troubleshooting measures for actuator failure of pneumatic valve: if it is found that there is vibration in the equipment pipeline, the equipment pipeline can be cleaned and readjusted to eliminate the vibration. If it is the problem of the pneumatic actuator control valve itself, the restriction orifice plate can be used to absorb part of the pressure drop, reduce the throttling speed and overcome the valve vibration, and the restriction orifice plate can also change the natural 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.


As one of the opening and closing devices, the pneumatic actuator installed on the valve has the function of using compressed gas to push the piston to make the valve rod connected with the valve play a role, driving the ball valve ball to move, thus playing the role of regulating the pipeline fluid medium. As one of the opening and closing parts, the ball rotates around the axis of the ball valve, which has a certain effect on the transmission of media. The ball valve is characterized by wear resistance, good sealing performance, and small resistance, so the internal valve body is subject to less wear and long service life, which makes the pneumatic valve more "handy" in the use of pipeline.