Common pneumatic ball valve failures

Common pneumatic ball valve faults – leakage – unstable action – vibration – slow action

In recent years, with the continuous development and progress of the industrial industry, pneumatic ball valve is widely used in various industrial industries. Pneumatic ball valve has become a necessary control valve in the production process of many industrial enterprises, and it is also an important component of industrial pipeline system automation. The application of pneumatic ball valve in industrial production can bring various conveniences to industrial production, especially long-term continuous production devices. However, due to the influence of various factors, some parts of the pneumatic ball valve will be damaged in the process of use, which will lead to failure. If the pneumatic ball valve fails, the operation of the whole system will be affected. Therefore, it is very important to find the failure of pneumatic ball valve in time and take effective measures.

Common pneumatic ball valve failures

The following summarizes the common faults of pneumatic ball valve in the operation process, mainly including the increased leakage of pneumatic ball valve, unstable action, vibration, slow action, non action of pneumatic ball valve and other faults, and analyzes the causes of these faults. It is hoped to provide countermeasures for relevant workers when dealing with the failure of pneumatic ball valve.

1. Fault and cause of increased leakage of pneumatic ball valve
The leakage of pneumatic ball valve mainly depends on the ball valve switch. To sum up, the increase of leakage of pneumatic ball valve is mainly due to the following two factors: first, the valve core in the stainless steel pneumatic ball valve is worn due to long service time, resulting in the loose closure of the ball valve, resulting in the increase of leakage; Second, when the pressure difference between various media is large, it will lead to the decline of rigidity, which will cause the ball valve to not be completely closed, and finally cause the leakage of pneumatic ball valve to increase.

2. Failure and cause of unstable action of pneumatic ball valve
The possible reasons for the unstable action of pneumatic ball valve are: ① the signal voltage is unstable; ② The air supply pressure is unstable.

3. Vibration fault and cause of pneumatic ball valve
The pneumatic ball valve is easily affected by the surrounding environmental factors in the working process. After working for a long time, the sealing packing and valve core will form a gap under the action of friction, there are other vibrating mechanical equipment around the pneumatic ball valve, and the unbalanced installation position of the pneumatic ball valve will lead to the vibration of the pneumatic ball valve.

4. Failure and cause of slow action of pneumatic ball valve
When the valve rod is bent and deformed, it will increase the friction caused by its round-trip action, causing the slow action of the pneumatic ball valve. When the graphite and asbestos packing lubricating oil and polytetrafluoroethylene packing are abnormal, it will also cause the slow action of the pneumatic ball valve. When there is dust inside the valve body and a positioner is installed inside the pneumatic ball valve, it will increase the resistance of the pneumatic ball valve stem operation, thus causing the slow action of the pneumatic ball valve.

5. Failure of pneumatic ball valve and its causes
Air source and signal are the premise and foundation to ensure the smooth operation of pneumatic ball valve. If the positioner has no air source, the pressure reducing valve may fail, and in serious cases, it may also cause the filter and pipeline to be blocked; If the positioner has air supply but no output, the orifice of the positioner will be blocked; If there is no air source and signal, when the temperature is low, the air source does not open, it will fail because the pressure reducing valve and air duct are blocked, and eventually lead to compressor failure. If there is an air source but no signal, it will damage the adjusting mesh film, so that the bellows of the positioner will leak

When the above faults occur in the operation of pneumatic ball valve, corresponding measures shall be taken according to the causes of the faults. EVP provides professional after-sales service for pneumatic ball valve manufacturers, and has many professional technicians, who can solve all kinds of professional problems in the use of products in a timely manner. Welcome to consult.

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