The main faults are poor operation and leakage. The main reasons are condensation water, dust, rust, poor lubrication, poor sealing ring quality, etc. in the compressed air.
| Fault: | Cause analysis: | Processing method: |
| No action when powered on: | Poor contact in the power supply wiring The power supply voltage fluctuation is not within the allowable range The coil is short-circuited or burned out | Connect the power cord Adjust the voltage within the normal range Replace the coil |
| Fluid cannot pass when the valve is opened: | The fluid pressure or working pressure difference does not meet the requirements The fluid viscosity or temperature does not meet the requirements Dirt and impurities are mixed around the valve core and the moving iron core The filter in front of the valve or the pilot valve hole is clogged The working frequency is too high or the lifespan has expired | Adjust the pressure or working pressure difference or replace a suitable product Replace a suitable product Clean the interior, and a filter valve must be installed in front of the valve Clean the filter or pilot valve hole in time Change Product model or replace with new product |
| The fluid cannot be cut off when closing the valve: | The fluid viscosity does not meet the requirements The fluid temperature does not meet the requirements The spring is deformed or has expired The valve seat is defective or dirt adheres to it The sealing gasket is detached, defective or deformed The balance hole or The orifice is clogged The operating frequency is too high or the lifespan has expired | Replace the appropriate product Replace the appropriate product Add a gasket or replace the spring Clean, grind or update Update and reassemble Clean in time Change the product model Or change to new products |
| External leakage: | The pipe connection is loose The outer seal of the pipe connection is damaged | Tighten the bolts or pipe threads Replace the seals |
| Serious internal leakage: | The fluid temperature does not meet the requirements The pilot valve seat and main valve seat have impurities or defects The pilot valve and main valve seals are detached or deformed The spring assembly is poor, deformed or has expired life Use The operating frequency is too high | Adjust the fluid temperature or replace If necessary, clean or grind, repair or replace Replace the seal Replace the spring Change the product model or replace with a new one |
| Excessive noise when power is on: | Loose fasteners Voltage fluctuations, not within the allowable range The fluid pressure or working pressure difference is not suitable The fluid viscosity does not meet the requirements There are impurities on the armature suction surface | Tighten Adjust to the normal range Adjust the pressure or working pressure difference or replace the product Replace with a suitable product Clean in time |
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