When a solenoid is first energized, its coil receives a pulse of high inrush current that decreases as the plunger closes. If the plunger does not close, the high inrush current will continue, which can cause the coil to overheat and burn out. This is the most common cause of solenoid valve failure and is easy to spot.

When a coil burns out, the spool of nylon around which the coil melts melts into the air gap beneath the plunger. If you find that the skeleton material has melted, check to see if the plunger is mechanically blocked from opening. On dual solenoid valves, see if both solenoid valves are energized at the same time. (Enameled wire insulated wire may also burn).

Standard coils are rated for 105°C (221°F), so they can safely reach and maintain temperatures slightly hotter than boiling water. Therefore, a solenoid that is too hot to touch may not overheat.

A drop in the power line voltage can prevent the solenoid from closing by reducing its force until it cannot overcome the resistance of the load. Check line voltage within 24 hours.

If the ambient temperature is too high, the coil's ability to dissipate heat through radiation is reduced. The resistance of an overheated coil increases, the current and force decrease, and the solenoid will not close, causing the coil to burn out again.

Check cycle rate. If the solenoid cycles too quickly, heat will build up faster than it can dissipate. The solenoid becomes too weak to turn off, so it receives a constant high inrush current and burns out.

In rare cases, the solenoid coil can burn out due to overvoltage. The plunger closed easily because of the extra force from the solenoid, but the high voltage caused the holding current to be too high, gradually overheating the coil and burning the insulation on the enameled wire. There is no melted spool in this case.

Another possible cause of a burned coil is a short circuit. Water-based coolants often come with fine metal particles. Accidental splash or immersion at the coil lead connections can cause a short circuit.

Eventually, the solenoid will hammer itself into pieces—as evidenced by mechanical damage and breakage. Excessive force may be caused by overvoltage or reduced load on the solenoid and must be absorbed when the plunger strikes the C-stack or the magnetic field. Determine the cause of damage before replacing the solenoid valve. Its force should closely match the load.

The above content introduces the Boyd solenoid valve troubleshooting checklist! The problem. In addition, ODJ-Tech Global LLC specializes in selling brand-new imported Baode solenoid valves, and promises to sell all products that are brand-new and imported. At the same time, it provides customers with quotations, selections, product information and other services.