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When troubleshooting pneumatic valve actuators, it is necessary to choose a suitable pneumatic actuator with a high cost performance ratio. Therefore, it is important to understand the types of actuators. The actuators can be divided into pneumatic actuators and electric actuators. The more commonly used actuators are these two types, and we always choose pneumatic actuators when purchasing them.
Then we need to select the actuator based on the size of the air source. The torque required to rotate the valve is not understood, and the valve life is not long if it is too large. Generally, it is OK to leave a 30% margin for torque. Pneumatic actuators can be seen from the text that this type of actuator is operated by pneumatic force. Compared to electric actuators, they can adapt to more environments, and their reasonable structure allows for greater load force, achieving the goal of high torque output. At the same time, compared to electric actuators, they act quickly and react faster. Of course, electric actuators also have many advantages that pneumatic actuators cannot match. The advantages of pneumatic actuators are also not available in current electric actuators, and both have their own shortcomings and advantages. Therefore, under the continuous development of technology in the future, the cost performance ratio of the two will be greatly improved.
Secondly, we conduct an assessment of the installed platform, and select actuators for each environment. There is a standard for actuators. We need to find the corresponding standard based on the valve to ensure that there is no mistake. As a pneumatic actuator, its function in valves is to make the valve device more convenient to use. Due to the access of pneumatic actuators, this valve can drive the rapid linkage of valve body components when operating in the pipeline, with a certain degree of automation effect. Moreover, because the actuator itself is energy driven, the drive of the valve body opening and closing parts is also of certain value. This valve is used in fluid pipelines to open and close due to low fluid resistance.
Common faults include a valve body that does not operate, the valve cannot be closed to zero, the pneumatic actuator has no feedback signal, and the signal pressure is unstable. There are also some special faults, such as vibration of the pneumatic actuator control valve. Next, we mainly analyze the causes of vibration of the special fault control valve and the handling measures.
The vibration of the pneumatic actuator control valve can cause the control system to fail to work properly. The main reasons for the vibration are as follows:
1. The external vibration source, i.e., the equipment pipeline itself, has vibration.
2. The selection of pneumatic actuator control valves does not meet the requirements for type selection, such as inappropriate flow characteristics, large valve diameters, poor spring stiffness, and so on, resulting in control valve vibration.
3. Erosion by fluid causes vibration.
Troubleshooting measures for pneumatic valve actuators: If it is found that the vibration is inherent in the equipment pipeline, the equipment pipeline can be cleaned and readjusted to eliminate the vibration. If there is a problem with the pneumatic actuator control valve itself, a flow limiting orifice can be used to absorb partial pressure drop, reduce throttle speed, and overcome valve vibration. In addition, the flow limiting orifice can also change the inherent frequency of the system to avoid vibration caused by the natural frequency of the control valve being close to the natural frequency of the system.
As an opening and closing device, the pneumatic actuator installed on this valve uses compressed gas to push the piston to make the valve rod connected to it function, driving the ball valve ball to move, thereby regulating the fluid medium in the pipeline. As an opening and closing member, 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 good wear resistance and sealing performance, and due to low resistance, the internal valve body suffers less wear and has a relatively long service life. This feature makes this pneumatic valve more "handy" in the use of pipelines.
