The micro solenoid valve cannot be used after being powered on, which may be caused by the following reasons:
I. Power supply related issues
1. Insufficient or excessive voltage
• Solenoid valves have a rated operating voltage range. If the actual supply voltage is lower than the rated voltage, solenoid valve may not be able to generate sufficient solenoid force to drive the valve core to move. For example, for a miniature solenoid valve with a rated voltage of 24V, when the supply voltage is only 12V, the solenoid force may be only about half of that in normal conditions, causing the valve core to be unable to open or close normally.
• Excessive voltage may damage the solenoid coil of the solenoid valve. For example, when the rated voltage is exceeded by a large amount, the coil will heat up seriously and even burn the insulation layer, causing a short circuit, thus making the solenoid valve unable to work.
2. Insufficient power supply
• The solenoid valve requires a certain amount of power to maintain normal operation during operation. If the output power of the power supply is not enough, when the solenoid valve is energized, the power supply may not provide enough current to generate sufficient solenoid force. For example, if the rated current of the power supply is less than the current required for the solenoid valve to operate, the solenoid valve will not operate normally.
3. Poor power connection
A loose plug, a damaged outlet, or a loose cord connection may be the cause. If the connection point between the power cord and the solenoid valve is loose, the circuit contact resistance will increase, reducing the actual current passing through the solenoid valve coil.
II. Solenoid valve itself is faulty
1. The valve core is stuck
• The valve core is the key component of the solenoid valve, and its movement controls the flow of the medium. If the valve core is stuck by impurities, for example, in a pneumatic system, dust, oil and other impurities in the air enter the solenoid valve and accumulate around the valve core, it will hinder the normal movement of the valve core.
• The valve core may be worn and deformed after long-term use. For example, frequent opening and closing actions reduce the matching accuracy between the valve core and the valve seat, and the valve core may be stuck in a certain position, causing the solenoid valve to fail to work properly.
2. The solenoid coil is damaged
• The solenoid coil is the key part in generating solenoid force. It may burn out due to overheating caused by long-term operation. For example, when working continuously in a high temperature environment and the heat dissipation conditions are poor, the temperature of the coil will continue to rise, exceeding the tolerance temperature of its insulation material, causing damage to the insulation layer, thereby causing the coil to short-circuit or open-circuit.
• The solenoid coil may also be subjected to mechanical damage during installation or use. For example, the coil may be accidentally hit when installing the solenoid valve, or it may be subjected to severe vibration during transportation, causing the wire inside the coil to break, causing the solenoid valve to lose its solenoid force and fail to work.
3. Seal damage
• The seal inside the solenoid valve is very important to prevent media leakage and ensure normal working pressure. If the seal is aged, worn or corroded, it will cause the medium to leak, causing the pressure balance on both sides of the valve core to be destroyed. For example, in a hydraulic system, when the seal is damaged, the hydraulic oil will leak, and the normal pressure difference cannot be established to drive the valve core to move, causing the solenoid valve to fail to work properly.
III. Media issues
1. Abnormal medium pressure
• If the pressure of the medium is too high and exceeds the rated pressure range of the solenoid valve, excessive force will be exerted on the valve core. For example, if a miniature solenoid valve with a rated pressure of 1MPa is used in a pipeline with a pressure of 1.5MPa, excessive pressure may cause the valve core to fail to open or close normally, or even damage the solenoid valve.
• Low media pressure can also cause problems. For example, in some solenoid valves that require a certain pressure difference to drive the valve core, when the pressure difference is insufficient, the valve core cannot function normally.
2. Physical and chemical properties of the medium
• The viscosity, corrosion and other properties of the medium will also affect the operation of the solenoid valve. If the medium viscosity is too high, the resistance to the valve core movement will increase. For example, when conveying high viscosity oil, the movement speed of the valve core will be significantly slowed down, or even may not be able to move.
• Corrosive media may damage the internal components of the solenoid valve. For example, when the solenoid valve is used to convey acidic or alkaline liquids, these liquids may corrode the valve core, valve seat, and seals, etc., causing the solenoid valve to malfunction and fail to function properly.
