Judging whether the electric butterfly valve needs to be replaced is an important task to ensure the safety and stable operation of the system. According to different operating conditions and the specific use environment, operators can judge whether the electric butterfly valve can no longer meet the process requirements and needs to be replaced through the following aspects.

Leakage assessment-leakage prevention detection
01/Gas circuit leakage/
Gas circuit leakage detection can be carried out by listening method and leak detection agent method. First, the operator can listen carefully to whether there is obvious gas leakage around the valve, which is usually manifested as a slight hissing or whistling sound. Secondly, a professional leak detection agent can be used to spray on the joints between the valve and other connectors. If bubbles are observed in these locations, it means that there is a gas circuit leak. This leakage may cause gas loss and affect the overall performance of the system, so it needs to be handled in time.
02/Media leakage/
Media leakage mainly occurs at the connection between the electric butterfly valve and the pipeline. If media leakage is found in these parts, it usually means that the seal may be damaged or aged. At this time, it is necessary to carefully check the integrity of the sealing material and consider replacing the relevant seals to restore the sealing performance of the valve. For high-risk industries such as chemical and petroleum, media leakage will not only affect production safety, but also cause serious environmental pollution. Therefore, after discovering media leakage, it should be highly valued and replacement or maintenance measures should be taken in time to prevent accidents.

Operation performance declines - check whether valve performance declines
01 Valve action is slow or response is inaccurate
When the pneumatic actuator cannot respond to the control signal quickly or accurately, the valve switching speed will be obviously abnormal. This abnormality is manifested as a delay in the opening or closing process of the valve, or the failure to reach the preset opening. Such situations usually indicate that there is a problem with the actuator, such as aging of internal mechanical components or control system failure, resulting in a decrease in the actuator's ability to respond to control signals. If this phenomenon continues to occur, the stability and production efficiency of the system will be greatly affected. It is recommended to check and repair as soon as possible, or even replace the actuator.
02 Decreased positioning accuracy
The positioner is a key device for controlling the valve opening. If its accuracy is reduced, the valve cannot be accurately adjusted according to the set requirements, resulting in deviations in flow control. This will affect the stability of the process flow, especially in places where refined operation requirements are high. Inaccurate flow regulation may lead to fluctuations in product quality or waste of resources. The decline in positioning accuracy is usually related to mechanical wear of the positioner or errors in the control system, and the positioner needs to be repaired or replaced in time.
03 Unstable pressure regulation
The air filter pressure reducing valve is an important component for controlling the air source pressure of the pneumatic actuator. If the pressure reducing valve cannot stably output the set pressure, the fluctuation of the air source pressure will directly affect the normal operation of the valve. The instability of the air source pressure will cause the valve to be unable to maintain a stable opening, thereby affecting the flow and pressure control of the entire system. At this time, it is necessary to check the working condition of the air filter pressure reducing valve to ensure its normal operation. If the pressure regulation is found to be unstable, the pressure reducing valve should be replaced in time to ensure the stability of the air source pressure.

Appearance damage-check the degree of wear
01 Crack or deformation of the accessory shell
When the outer shell of the electric butterfly valve is obviously cracked or deformed, although this may not immediately affect the normal operation of the valve, this appearance damage may have an adverse effect on the internal structure, thereby affecting the overall performance of the equipment. For example, the deformation of the outer shell may cause uneven force on the internal parts, thereby shortening the service life of the valve. If the outer shell is severely cracked or deformed, it is recommended to consider replacing the entire valve or its damaged part to ensure the safety and reliability of the system.
02 Loose, worn or broken connection parts
The normal operation of the electric butterfly valve depends on the tight combination of various connection parts. If the connecting shaft between the actuator and the valve is loose, worn or broken, the valve may not be able to open and close normally, or the action may be slow and abnormal. In addition, if the wiring terminals of the solenoid valve are worn or loose, it may cause electrical failures, which in turn affect the control accuracy and operation stability of the electric butterfly valve. The looseness or damage of these parts is usually caused by long-term operation and the influence of the external environment. Once discovered, they should be repaired or replaced in time to avoid further failures.

Corrosion and structural damage-pay attention to corroded parts
In corrosive environments, such as oceans or chemical sites, valve bodies, valve stems and other parts may fail due to medium corrosion. Severe corrosion will not only affect the structural strength, but also cause seal failure. If the parts are corroded beyond repair, it is recommended to replace them as soon as possible to avoid safety hazards.
Expiration of equipment service life-pay attention to the life cycle
Every equipment has its design life, and electric butterfly valves are no exception. When the electric butterfly valve reaches or exceeds the manufacturer's recommended service life, although the equipment may continue to operate, its performance and reliability are often greatly reduced. Increased maintenance frequency and cost are also signs of equipment aging. At this time, even if the electric butterfly valve has no obvious failure for the time being, the operator should consider replacing it to reduce potential operating risks.
Unable to adapt to new process requirements-upgrade butterfly valve
With the continuous upgrading of production processes, the performance parameters of the original electric butterfly valve, such as flow rate and pressure level, may no longer meet the new process requirements. For example, if a production line has higher requirements for the accuracy of flow control, and the existing electric butterfly valve cannot meet this requirement, it must be replaced with a new model valve with better matching performance. This not only improves the operating efficiency of the system, but also effectively reduces the production risks caused by insufficient valve performance.