Analysis of the related failures of the automatic drain valve of the self-cleaning filter

As a key component of the self-cleaning filter to automatically remove impurities after cleaning the filter screen, the automatic drain valve plays a very important role in ensuring the stable operation of the self-cleaning filter. The automatic drain valve of the self-cleaning filter generally can choose electric ball valve, electric butterfly valve, hydraulic solenoid diaphragm valve, solenoid valve and other types of valves. Some users often have the following types of problems in the automatic drain valve during the use of self-cleaning filters. Let's analyze them one by one.

　　 After using the filter for a period of time, it was found that the automatic drain valve was leaking or not working.

    Cause Analysis:

1. When using ordinary solenoid valves, because domestic solenoid valves are often pilot solenoid valves, the pilot hole is a small hole (0.3-2mm), but the water passing through the sewage valve is generally sewage with a lot of impurities. The pilot hole is easily blocked by these impurities, but once the pilot hole is blocked, the diaphragm of the solenoid valve will not close tightly, which will cause the drain valve to leak. The solenoid coils of domestic solenoid valves are generally more powerful (more than three times that of foreign equivalent products). Large power means large heat, and large heat affects the life of the solenoid coil. This is why the failure rate of domestic ordinary solenoid valves is High reason.

2. When using an electric ball valve: everyone knows that the spool of an electric ball valve is a rotating stainless steel sphere, which is turned by the actuator to achieve the valve opening and closing effect. If there are many metal impurities and sand particles in the system, these impurities are easily blocked. Between the inner wall of the valve body and the valve core, the valve core does not move in place or is worn out, thereby causing the electric ball valve to leak water.

3. In order to save costs, some manufacturers use electric butterfly valves as drain valves. When the water quality of the water system is relatively poor, and the frequency of cleaning and draining the self-cleaning filter is relatively high, the seals of the electric butterfly valves are easily worn and affect the valve's performance. Closure, causing water leakage.