1： The manifestation of listening to sound;

1. The operating speed of the solenoid valve is the fastest among all valves, at the ms level. Under normal circumstances, when powered on, a crisp and sharp "bang" sound can be heard. If the coil is burned, there will definitely be no sound;

2. Another situation is that there is a continuous "bang" or "bang" sound after being powered on, which is usually due to insufficient suction, insufficient voltage, or impurities in the valve chamber causing the valve core to get stuck;

3. After the communication solenoid valve is energized, there will also be a sound, but the current sound that continues to stabilize returns to normal;

4. If the solenoid valve is activated, you should be able to hear the sound of the pipeline medium moving;

2： Look at external manifestations;

1. Check if the coil is wrapped or cracked,

2. Check for any damage to the wiring;

3. Is there any cracking in the valve body, especially some plastic or iron valve bodies that are prone to aging at low or high temperatures, which may cause this problem;

3： The intrinsic manifestation of testing;

1. If the coil is good, there will be a magnetic field outside the coil. Just try using an iron nail to find out;

2. Touch the temperature of the coil. Except for high-temperature and low-temperature solenoid valves, most solenoid valves feel warm about half an hour after being powered on. If they are cold, it can be judged that the wiring is open. If they are particularly hot (except for steam like high-temperature media), it can be judged that they are short circuited;

3. If you can still hear the sound of water flow or airflow at the outlet of the pipeline after sealing, but you can significantly feel the loud noise when there is no valve opened - what are the manifestations of the broken solenoid valve - this is a very significant one, which indicates that the valve is not tightly closed and there is a problem with the sealing direction.

Article source: Jiangmen Pneumatic Equipment Manufacturer http://www.jh-hydraulic.com