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Troubleshooting of pneumatic valve actuator

In order to solve the problems of pneumatic valve actuators, we will choose the appropriate pneumatic actuators and the pneumatic actuators with high cost performance ratio. First, we need to know the types of actuators. Actuators can be divided into pneumatic actuators and electric actuators. The commonly used actuators are these two types. When we purchase, we will choose pneumatic actuators.

Then we need to select the actuator according to the size of the air source. The torque required to rotate the valve is too large to understand, and the life of the valve is not long. It is usually OK to leave 30% margin for 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 environments. The reasonable structure makes its load force greater and achieves the goal of high torque output. At the same time, compared with the electric actuator, it acts quickly and reacts quickly. Of course, the electric actuator also has many advantages that the pneumatic actuator cannot compare with, and the advantages of the pneumatic actuator are also not available to the current electric actuator, both of which have their own shortcomings and advantages. Therefore, under the continuous development of science and technology in the future, the cost performance ratio of the two will be greatly improved.

Secondly, we assessed the installed platform. Each environment selects actuators, and there is a standard for actuators. We should find the corresponding standard according to the valve. As a pneumatic actuator, in fact, its role in the valve is to make the valve device more convenient in use. The connection of the pneumatic actuator enables the valve to drive the quick linkage of the valve body parts when it operates in the pipeline, which has a certain automation effect. Moreover, the actuator itself is energy driven, so it 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 failures include valve body failure, valve failure to close to zero position, no feedback signal of pneumatic actuator, and unstable signal pressure. There are also some special faults, such as the vibration of the pneumatic actuator control valve. Next, we mainly analyze the causes of the vibration of the control valve with special faults and the treatment measures.

Troubleshooting of pneumatic valve actuator

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

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

2. The selection of the control valve of the pneumatic actuator does not meet the selection requirements, for example, the flow characteristics are not suitable, the valve diameter is too large, and the spring stiffness is poor, which causes the control valve vibration.

3. It is eroded by the fluid to produce vibration.

Troubleshooting measures for pneumatic valve actuator: if it is found that there is vibration in the equipment pipeline itself, the equipment pipeline can be cleaned and readjusted to make its vibration disappear. If it is the problem of the control valve itself of the pneumatic actuator, the flow limiting orifice can be used to absorb part of the pressure drop, reduce the throttling speed, and overcome the valve vibration. The flow limiting orifice can also change the natural frequency of the system to avoid the vibration caused by the natural frequency of the control valve being close to the natural frequency of the system.

As one of the opening and closing devices, the pneumatic actuator installed on this valve can use compressed gas to push the piston to make the valve rod connected with it play a role, drive the ball valve ball to move, thus playing a role in regulating the pipeline fluid medium. As the opening and closing part, the ball rotates around the axis of the ball valve, which has a certain effect on the transmission of media. Ball valves are characterized by wear resistance, good sealing performance, and low resistance, so the internal valve body is less worn and has a long service life, which makes this pneumatic valve more "handy" in the use of pipelines.

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