1. corrosion: the proportional valve is easy to be corroded by oxides during long-term use, especially in high temperature environment, and the corrosion rate is faster. Corrosion will destroy the internal structure of proportional valve, and then affect the use effect.
2. Air valve filter: The gas of wall-hung boiler will pass through the air valve filter before entering the proportional valve. If the filter is not cleaned or replaced in time, it will cause the filter to block and further lead to the failure of the proportional valve.
3. Foreign matter entry: When the wall-hung boiler is in normal operation, gas and air will be supplied to the combustion chamber under the reasonable distribution of proportional valve. If there are foreign objects in the gas or air during this process, such as sediments and sundries, the proportional valve will fail.
4. High temperature: The proportional valve needs to withstand the challenge of high temperature environment in the working process, which may exceed the tolerance range of the proportional valve and lead to the failure of the proportional valve.
5. Mechanical failure: The proportional valve consists of many precise components. If one of these components fails, it will lead to the failure of the proportional valve. This kind of failure is usually caused by wear and tear.
To sum up, there are various reasons for the failure of proportional valve of wall-hung boiler, such as corrosion, air valve filtration and foreign matter entry, high temperature or mechanical failure. For these problems, it is necessary to check and repair in time to ensure that the proportional valve can work normally. At the same time, we should also pay attention to the use specification of wall-hung boiler, and do not add any foreign matter in gas or air to prevent the proportional valve from failing.