Troubleshooting of pneumatic valve actuator

To solve the problem of pneumatic valve actuator, we will choose the more suitable pneumatic actuator and the pneumatic actuator with high cost performance ratio. Then we should first understand the types of actuators. The actuators can be divided into pneumatic actuators and electric actuators. The more commonly used actuators are the two types. We will choose pneumatic actuators when we buy them.





Then we need to select the actuator according to the size of the air source. The torque required to turn the valve can not be understood. The service life of too large valve is not long. Generally, it is OK to leave 30% margin for torque. Pneumatic actuator can be seen from the text that this type of actuator is operated by pneumatic force. Compared with the electric actuator, it can adapt to more environments, and its reasonable structure makes its load greater, achieving the goal of high torque output. At the same time, compared with the electric actuator, it acts quickly and reacts quickly. Of course, electric actuators also have many advantages that pneumatic actuators can't match. The advantages of pneumatic actuators are also those that electric actuators don't have at present. Both of them 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 will evaluate the installed platform, and select the actuator in each environment. There is a standard for the actuator. We will not be wrong if we 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 of the access of pneumatic actuator, this kind of valve can drive the rapid linkage of valve body parts when operating in the pipeline, which has certain automation effect. Moreover, because the actuator itself is energy-driven, it is also of certain value for the drive of valve body opening and closing parts. This valve is used in the fluid pipeline to open and close due to the small fluid resistance.





Common faults include the valve body does not act, the valve cannot be closed to the zero position, the pneumatic actuator has no feedback signal, and the signal pressure is unstable. There are also some special faults, such as the vibration of the pneumatic actuator control valve. Next, we mainly analyze the causes of vibration of the special fault control valve 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 reasons for the vibration are as follows:





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





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





3. Vibration is caused by fluid erosion.





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 pneumatic actuator control valve itself, the restriction orifice can be used to absorb part of the pressure drop, reduce the throttle speed, and overcome the valve vibration, and the restriction 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 the opening and closing device, 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, and drive the ball valve ball to move, thus playing the role of regulating the fluid medium in the pipeline. As one of the opening and closing parts, the ball rotates around the axis of the ball valve, which has a certain effect on medium transmission. The ball valve is characterized by good wear resistance and sealing performance. Due to small resistance, the internal valve body is subject to less wear and long service life. This feature makes this pneumatic valve more "handy" in the use of pipelines.