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The solenoid valve is the core control component for the airbag massage chair to achieve precise inflation and deflation. Inside the massage chair, multiple airbags correspond to different body parts respectively, and each air path is precisely controlled by an independent solenoid valve. When you select the "Shoulder and Neck Relaxation" mode, the control system instantly sends a command to the corresponding solenoid valve. The coil is energized to generate magnetic force, driving the valve core assembly to move in milliseconds, opening or closing the airway channel. This millisecond-level precise switching enables the airbags to rise and fall in an orderly manner according to the preset program, simulating the delicate techniques of real human massage and pressing.