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Pneumatic valve actuator troubleshooting

2020-06-02
Pneumatic valve actuator troubleshooting will choose a more suitable pneumatic actuator, cost-effective pneumatic actuator, then we must first understand the type of actuator, actuator can be divided into pneumatic actuator and electric actuator, the more commonly used Actuators are these two types. When we buy, we will choose pneumatic actuators.

Then we have to choose the actuator according to the size of the air source, the torque required to turn the valve, the size is unknown, the valve life is too long. Generally, it is OK to leave a margin of 30% for the torque. Pneumatic actuators can be seen from the text that this type of actuator is operated by pneumatic pressure. Compared with electric actuators, it can adapt to more environments, and its reasonable structure makes it more powerful, which achieves the goal of high torque output. At the same time, compared with electric actuators, it has faster movement and faster response. Of course, electric actuators also have many advantages that are unmatched by pneumatic actuators. The advantages of pneumatic actuators are not available in current electric actuators. Both have their own disadvantages and advantages. Therefore, with the continuous implementation of technology in the future, the cost performance of the two will be greatly improved.

Second, we evaluate the installed platform. Each environment chooses an actuator. There is a standard for the actuator. We must find the corresponding standard based on the valve, and we will not be wrong. As a pneumatic actuator, in fact, its role in the valve is to make the valve device more convenient in use. The access of the pneumatic actuator makes this valve in the pipeline can drive the rapid linkage of the valve body components, has a certain automation effect, and because the actuator itself is driven by energy, so for the valve The driving of the valve body opening and closing member is also of certain value. This valve is used to open and close the fluid pipeline due to its low fluid resistance.

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

Pneumatic valve actuator troubleshooting

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 pipe itself has vibration.

2. The selection of pneumatic actuator control valve does not meet the selection requirements, such as unsuitable flow characteristics, large valve diameter, poor spring stiffness, etc., which cause the control valve to vibrate.

3. Vibration due to fluid erosion.

Pneumatic valve actuator troubleshooting measures: If it is found that the equipment pipeline itself has vibration, you can clean and readjust the equipment pipeline to make the vibration disappear. If it is the problem of the pneumatic actuator control valve, you can use the orifice plate to absorb some pressure drop, reduce the throttle speed, overcome the valve vibration, and the orifice plate can also change the natural frequency of the system, avoiding The natural frequencies of the systems are close to each other and vibration occurs.

As one of the opening and closing devices, this valve-mounted pneumatic actuator has the use of compressed gas to push the piston to make the valve stem connected to the valve function, driving the ball valve ball to move, thereby regulating the fluid medium in the pipeline. effect. As one of the opening and closing parts, this ball rotates around the axis of the ball valve, which has a certain effect on the conveyance of the medium. Ball valve is characterized by wear resistance, better sealing performance, and less resistance, so the internal valve body is less worn and has a longer service life. This feature makes this pneumatic valve more useful in the use of pipelines. Handy. "