Reasons and analysis of common failures in the use of solenoid valves

1. Solid matter is brought into the valve, causing the solenoid valve to fail to close properly. For most types of solenoid valves, no particulate matter can be brought into the valve, even very small particles. A customer once sent a DN100 water valve back to the factory and asked him to repair it. After we opened the valve, we found a small iron filing on the diaphragm. Take it off, clean the valve body and accessories again, and re-test, the valve can work normally. We have seen small rocks, raw material strips, iron filings, and even cockroaches in the valves returned for repair.

2. The voltage is not enough, causing the solenoid valve to not open normally. Especially for relatively low voltages such as DC24V, DC12V, AC24V, etc., you must ensure that the fluctuation range of the voltage is within plus or minus 10%. If the power supply voltage is lower than 10% of the rated voltage, it may cause the solenoid valve to fail to open normally.

3. The solenoid valve is installed in the wrong direction. The solenoid valves of regular manufacturers will use arrows to indicate the flow direction of the medium on the valve body. When installing, install them in the direction indicated by the arrows. Do not install them backwards. Otherwise, the solenoid valves will be opened by the reverse pressure and cannot be closed normally. In addition, the solenoid valve generally needs to be installed horizontally, the coil is vertically upward, and the medium flow direction is consistent with the arrow direction of the solenoid valve. Under special circumstances, a 30° tilt is allowed. If the solenoid valve is installed vertically, it may cause the solenoid valve to close unreliably.

When using a solenoid valve, it is best to install a filter screen at the front of the solenoid valve in the piping system to prevent particulate impurities from entering the solenoid valve cavity. In any case, it is necessary to ensure that the voltage at the power input end of the solenoid valve meets the requirements, not only the voltage at the output end of the regulator, because it involves the voltage loss of the cable length. At the same time, the capacity of the regulator should be sufficient.