How to Determine if a Solenoid Valve is Faulty?

[DeHannah]

Methods to Determine Solenoid Valve Condition: 1. Observation Method: The most effective way to check a solenoid valve is through direct observation. A solenoid valve functions like a switch—when voltage is applied to the coil, it should open or close. For example, if a solenoid valve controlling an air source fails to allow air through after receiving voltage, it indicates the valve isn't working or isn't closing properly, confirming a fault. 2. Check Surface Temperature: Solenoid valves aren't designed for prolonged power supply. Extended use can cause slight coil heating, but severe overheating suggests a malfunction—such as the core failing to engage. If the coil area feels excessively hot, immediately disconnect power, remove the coil, and gently tap the valve body to free the core from sticking. Reinstall the coil and test. If it operates normally, it can continue to be used; otherwise, replace the core or clean it promptly. 3. Measure Resistance with a Multimeter: Besides core issues, prolonged use can increase coil resistance, weakening magnetic force. Use a multimeter's ohmmeter to measure the coil's resistance, typically between 20-150Ω. Excessive resistance indicates weakened magnetism, necessitating coil replacement.