The solenoid valve is abnormal, how should we troubleshoot it? Let’s explore the reasons why the solenoid valve is abnormal:
1. No oil comes out or the flow rate is small
Generally speaking, first, check whether there is any foreign matter stuck in the mechanical part of the solenoid valve,
and then check the solenoid valve for malfunction. You can check like this:
Touch the outside of the solenoid valve with your hand at the moment of turning on the machine to see if there is a feeling of impact and then make a “pop” sound.
If there is, it is not a fault of the solenoid valve. If not, check whether the 220V power supply that provides the solenoid valve is normal.
use a multimeter to measure whether the voltage of the large and small valve terminals and the common line is 220V when starting up.
If so, it is mostly caused by the solenoid valve coil being burned out and can be replaced.
Most of the problems with low flow rates are caused by the failure of the solenoid valve to open.
You should check whether the solid-state relay controlling the large valve is burned out.
The check method is to use a multimeter to measure the voltage between the terminal of the large valve and the public line when the machine is turned on.
It is about 220V. The coil is burned out. If not, the solid state relay controlling the large valve on the power supply board is broken. If the oil does not come out when it is close to the preset value,
it is mostly because the small solenoid valve cannot open. The inspection method is the same as above.
2. No low flow rate during preset refueling
First, check the setting of the early shutdown valve of the tanker. If it is “0.00”, just reset it. Secondly, check whether there are any wiring errors during the maintenance of the large and small valves.
If the problem is not solved after the correct check, you should consider the control function on the power supply board. The valve relay is damaged.
3. The coil is burned out
After powering on, the solenoid valve does not produce oil, the appearance of the coil is abnormal, and the core rod built into the coil has no electromagnetic suction. The solution is to replace the solenoid coil
4. Internal leakage
When the solenoid valve cannot be closed after cutting off the power supply, it was observed on-site that after the preset quantitative amount is reached, the oil gun is still open and the flow rate is still present.
The reason may be that the diaphragm is damaged or there is foreign matter in the valve parts that prevents the main valve from closing. The solution is to replace the diaphragm or clean the valve parts.
In actual work, measurement inspectors and maintenance personnel often encounter problems with inaccurate fuel metering and solenoid control valve failures.
Only through proper understanding, use, and maintenance of solenoid valves can accurate measurement results and consistent value transmission be maintained.
Only in this way can the fault be correctly diagnosed and solved in time to ensure the normal operation of the solenoid valve.