Automotive valves are mechanical components used to control the flow of air, fuel, and other fluids into and out of an engine. They are typically made of metal, and are usually cylindrical in shape. Valves are used to control the timing and amount of air or fuel entering an engine, and are an essential part of the internal combustion process.

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Valves are designed to open and close in response to the pressure of the engine. When the engine is running, the valves open and allow air and fuel to enter the combustion chamber. This mixture is then compressed by the pistons, and when the pressure in the chamber reaches a certain point, the valves close and the combustion process begins.

Valves come in a variety of sizes and shapes, and the number of valves used in an engine depends on the engine type. Most modern engines use four-valve designs, which allow for greater air and fuel flow into the engine. Other designs such as two-valve and three-valve designs are still used in some engines.

Valves are also used to control the exhaust gases from the engine. Exhaust valves open to allow the exhaust gases to escape from the engine, and some designs also include a re-circulation valve that allows the exhaust gases to be re-circulated back into the engine.

Valves are a critical component of any engine, and must be regularly inspected and maintained. Valves can become clogged or corroded, which can lead to reduced performance or even engine failure. It is important to keep the valves clean and free of debris, and to regularly check the valve clearances to ensure proper operation.