Solenoid valve faults and troubleshooting methods

Detection method: first use a multimeter to measure its continuity, and the resistance value is close to zero or infinity, that means the coil is short-circuited or disconnected. If the resistance measured is normal (about tens of ohms), it still does not mean that the coil must be good (I once measured a solenoid valve coil with a resistance of about 50 ohms, but the solenoid valve could not work. After replacing the coil, everything is normal. ), please carry out the following final test: find a small screwdriver and place it near the metal rod that penetrates the solenoid valve coil, and then energize the solenoid valve. If magnetism is felt, then the solenoid valve coil is good, otherwise it is bad .

Solution: Replace the solenoid valve coil.

Trouble phenomenon: If the solenoid valve has a plug/socket, there may be a problem with the metal reed of the socket (I have encountered it), wiring problems on the plug (such as connecting the power cord to the grounding wire), etc. The reason is that the power cannot be sent to the coil. It is best to develop a habit: screw the fixing screw on after the plug is inserted into the socket, and screw the fixing nut on the coil after the valve core rod.

If the solenoid valve coil plug is equipped with a light-emitting diode power indicator, then it must be connected when the solenoid valve is driven by a DC power supply, otherwise the indicator will not light up. In addition, do not exchange the power plugs with LED power indications of different voltage levels. This will cause the LEDs to be burned/the power supply (replace the plug with a low voltage level) to short-circuit or the light-emitting diodes are very weak (switch to use High-voltage plug).

If there is no power indicator, there is no need to distinguish the polarity of the solenoid valve coil (unlike the transistor time relay whose coil voltage is DC and the intermediate relay whose coil voltage is DC with a diode/resistor leakage circuit connected in parallel, the polarity needs to be distinguished. ). Treatment method: correct wiring errors, repair or replace plugs and sockets.

Trouble phenomenon 1: When the pressure of the medium through the solenoid valve is normal, press the red manual button of the solenoid valve, and the solenoid valve has no response (the pressure medium does not change on and off), indicating that the spool must be broken.

Solution: Check whether there is a problem with the medium, such as whether there is a lot of water in the compressed air (sometimes the oil-water separator does not play a big role, especially when the pipeline design is poor, the compressed air to the solenoid valve will have a lot of accumulation. Water), whether there are many impurities in the liquid medium. Then remove the water or impurities in the solenoid valve and pipeline. If it doesn't work anymore, please repair it (if you have time and patience and if necessary, replace the spool, or simply replace the entire solenoid valve.

Fault phenomenon 2: After inspection, the coil is the original coil and the magnetism is normal when the coil is energized, but the solenoid valve still does not operate (the function of the solenoid valve manual button may be normal at this time), indicating that the spool is broken.

Solution: Please repair or replace the valve core, or simply replace the entire solenoid valve.

1. Check whether the power wiring is bad → re-wiring and the connection of the connector

2. Check whether the power supply voltage is within the ± working range-→ adjust to the normal position range

3. Whether the coil is unsoldered → re-soldered

4. The coil is short-circuited → replace the coil

5. Whether the working pressure difference is not appropriate → adjust the pressure difference → or replace the commensurate solenoid valve

6. The fluid temperature is too high → replace the commensurate solenoid valve. 7. There are impurities that cause the main valve core and moving iron core of the solenoid valve to jam → clean, if the seal is damaged, replace the seal and install the filter

8. The viscosity of the liquid is too high, the frequency is too high, and the life is reached → replace the product

1. The seal of the main valve core or the iron core is damaged → replace the seal 2. Whether the fluid temperature and viscosity are too high → replace the corresponding solenoid valve

3. Impurities enter the spool or moving iron core of the solenoid valve → clean 4. The spring life has reached or deformed → replace 5. The orifice balance hole is blocked → clean in time 6. The working frequency is too high or the life has reached → change Product or update product

1. Internal leakage → check whether the seal is damaged and whether the spring is poorly assembled

2. External leakage → Loose connection or damaged seal → Tighten the screw or replace the seal 3. Noisy when power on → The solid part on the head is loose, tighten it. If the voltage fluctuation is not within the allowable range, adjust the voltage. If there is impurities or unevenness on the suction surface of the iron core, clean or replace in time.

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