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NORGREN-HERION solenoid valve common faults and troubleshooting methods

First, internal leakage
The main considerations are the sealing form of the valve and the quality sealing form of the seal: soft and hard seals, and soft seals are divided into dynamic and static seals. In terms of the form of the seal, the hard seal is the best, but the processing accuracy is relatively high and the price is relatively high. Most of the solenoid valves on the market are soft seals, while the static seals are more static than dynamic ones. The seals of HERION solenoid valves are static seals, and the seals are made of specially treated rubber. Basically, the number of movements of the spool can be guaranteed from 1 to 3 million times, and the service life is about 8-10 years.
Second, the external leakage
Mainly the processing method of air source interface. Common piping is mainly stainless steel, copper and rubber tube. The interface card is mainly made of stainless steel, copper and plastic. If rubber or plastic interface card is used, the relative use is relatively If it is easier to destroy, there will be a leak, which will cause the valve to malfunction.
Third, the elasticity of the spring
The general solenoid valve has gas reset or spring return. If the spring is reset, due to the frequency of the action and the service life, the spring will be invalid, and the reset failure will occur, causing the spool to be out of position and the large valve to be closed or It is open.
Fourth, blockage
Mainly because small particles block the air source interface, resulting in unsmooth airflow, abnormal valve opening, or hard objects jamming the valve core, causing the valve core to fail to operate, or the valve body may have water for a long time, resulting in the valve body. The lubricant is diluted and the valve core is stagnation. This phenomenon is mainly caused by the fact that the filter is not installed before the valve, or the pipe is not cleaned, or the rust is caused by the material of the pipe. Therefore, we recommend adding a NORGREN filter pressure reducing valve before the valve to extend the life of the solenoid valve and reduce the failure rate of the large valve.
Five, manual operation device
Many solenoid valves are now equipped with manual operating devices for operation in an unpowered state or for safety during emergency shutdown. What needs to be noted here is the on-site confirmation type manual operation button. If the person does not confirm the solenoid valve on the spot, it will not start again. However, the common solenoid valve manual operation button should not be touched casually.
Sixth, air source pressure
Mainly pilot-operated solenoid valves generally require a starting pressure of at least 1 bar. If the pressure of the air supply is too small, the solenoid valve cannot be opened.
Seven, the coil burned out
Mainly due to coil short circuit or short-time current is too large, this may be due to the inlet of the coil, or the improper treatment of the wiring part, or the ambient temperature used may be too high.
Eight, the voltage is too low
Since the solenoid valve has a certain distance from the central control room, if the solenoid valve is not properly selected, the power consumption cannot meet this transmission distance, which will cause the solenoid valve to fail to start normally.

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