Working principle of automobile air valve

How a car air valve works depends primarily on its type and design. Here's how a few different types of car air valves work:

Pneumatic actuators. This type of air valve uses a device that converts air pressure energy into mechanical energy. It is mainly composed of a pneumatic motor and a pneumatic cylinder. When compressed air enters the pneumatic actuator through the air line control valve, the air pressure difference before and after the cylinder will push the piston movement of the pneumatic valve, thereby opening and closing the valve. 1

Secondary air valve. This type of air valve supplements the exhaust gas under different operating conditions of the entire vehicle to ensure the amount of oxygen required for combustion. It draws fresh air into the exhaust system through the negative pressure created by the engine when exhausting, while preventing exhaust gas from flowing back into the intake system. 2

Bimetallic air valve. This type of air valve utilizes a bimetallic element and a heating coil to control the opening and closing of the valve. When the engine starts running, the temperature is low and the air valve is open. As the engine temperature increases, the bimetal element deforms and gradually closes the valve, thereby reducing the engine speed. 34

Wax column type air valve. This type of air valve relies on changes in engine cooling water temperature to control the passage area of the air valve. When the cooling water temperature is low, the wax column expands and the valve opens. As the temperature increases, the wax column shrinks and the valve closes.

These air valves work together to ensure that the engine receives appropriate air supply and control under different operating conditions, thereby ensuring normal engine operation and performance.