220V air compressor pressure switch, four-port multi-function control valve (with rapid pressure relief function) This is an integrated control core specifically designed for 220V air compressors, integrating automatic pressure control, safety relief, and multiple interface expansion. With a four-port design, it can simultaneously connect the air compressor main unit, storage tank, safety valve, and gas-using equipment, achieving efficient and stable system pressure management and rapid exhaust, ensuring the safe and energy-efficient operation of the air compressor system. It is equipped with a high-precision pressure sensing element, allowing for presetting of start/stop pressure values (such as adjustable from 0.4 to 0.8 MPa). When the pressure in the air storage tank reaches the upper limit, it will automatically shut down; when it drops below the lower limit, it will automatically start, achieving fully automatic operation and avoiding overload. There are four standard threaded interfaces (usually G1/4" or custom specifications), which can simultaneously connect to: the power control line of the air compressor motor (220V) Gas storage tank pressure input pipe Safety valve or pressure gauge interface Quick pressure relief exhaust port There is an independent manual pressure relief valve (or automatic pressure relief design). After the machine is shut down, it can instantly release the residual high-pressure gas in the pipeline, protecting the motor from heavy-load startup next time and enhancing maintenance safety. The shell is made of high-strength engineering plastic or metal, which is pressure-resistant and explosion-proof. The electrical part complies with the 220V industrial standard, has good insulation performance, and is suitable for frequent start-stop operations. The interface is clearly marked and is equipped with adjustment knobs (or screws) for setting the pressure range. Users can customize the start and stop thresholds according to the equipment requirements. Applicable scenarios: Medium and small-sized 220V piston-type/muffled air compressors Air supply systems for pneumatic tools (nail guns, spray guns, air cannons, etc.) Air circuits for model painting, tire inflation, and small production lines In DIY workshops, auto repair shops, family garages, etc. Technical parameters example: Working voltage: AC 220V ±10% Rated current: Usually 15A - 20A (please check the specific model) Pressure adjustment range: 0.2 - 1.0 MPa (common value, customizable) Interface thread: G1/4" or NPT 1/4" Protection level: IP54 (dust and splash-proof) Applicable temperature: -20℃ ~ 80℃ Installation Instructions: Please operate after cutting off the power supply. Have professionals handle the wiring. Before connecting, confirm that the interface thread specifications match. It is recommended to use sealing tape. Before using for the first time, adjust the knob to set the appropriate start and stop pressure, and test whether the pressure relief function is normal. Select the model with the corresponding current level and interface specification based on your air compressor power (motor current) and gas path requirements to ensure a safe match.