DO YOU KNOW THE SOLENOID VALVE OF SCREW AIR COMPRESSOR?

The solenoid valve in the screw air compressor is a key component for controlling the gas circuit, oil circuit or water circuit. It realizes automatic switching through electrical signals and directly affects the operating efficiency, safety and stability of the equipment. Its functions are mainly reflected in the following aspects:

1. Start-stop control

Start unloading: When the compressor starts, the electromagnetic force drives the valve core to open, release the internal pressure, reduce the motor starting load, avoid excessive current, and extend the life of the equipment.

Shutdown protection: When shutting down, the spring returns to close the valve core and the intake valve is closed to prevent high-pressure air backflow or sudden drop in system pressure, protecting internal components.

2. Pressure regulation

System pressure management: cooperate with the pressure sensor to realize gas volume regulation. When the pressure of the gas tank reaches the set upper limit, the solenoid valve cuts off the air intake and the compressor runs without load; when the pressure is lower than the lower limit, the air supply is restored to maintain stable output.

Energy-saving effect: avoid frequent start and stop of the compressor, reduce energy consumption, and improve operating efficiency.

3. Airflow direction control

Path switching: In a multi-circuit system, the solenoid valve switches the airflow direction by opening and closing, such as distributing compressed air in post-processing links such as drying and filtration.

4. Safety protection

Overload protection: When the temperature is abnormally high or too high, the solenoid valve will urgently cut off the gas circuit and cooling oil circuit to prevent equipment damage.

Backflow prevention: When the machine is shut down, the solenoid valve is powered off, the valve core closes the oil circuit, and the gas backflow in the pipeline is blocked to prevent oil or impurities from flowing back into the system and causing pollution.

5. Automatic control

Signal response: Receive electrical signals from PLC or controller to achieve remote or automatic start and stop, suitable for unattended or intelligent control scenarios.

6. Maintenance and Fault Prevention

Reduce wear: Precise control reduces the frequent movement of mechanical parts (such as valves and pistons), reducing wear.

Fault diagnosis: Solenoid valve abnormalities (such as coil burnout, jamming, etc.) can directly reflect system problems, facilitating quick troubleshooting. 

Common types of solenoid valves

Normally open: the passage is open when the power is off, and closed when the power is on

Normally closed: the passage is closed when the power is off, and opened when the power is on

Two-position two-way: control the on and off of a single pipeline

Two-position three-way: switch two outlet passages (such as loading/unloading)

Proportional valve: adjust the opening through the current signal (precision control)

The solenoid valve integrates control, protection, energy saving and other functions in the air compressor, which directly affects the stability, energy saving effect and life of the equipment. Regular maintenance (such as cleaning the valve core, checking the sealing, etc.) is the key to ensure its reliable operation.

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