Valves are the part that adjusts the passage of fluids, keeps them stretched with the spring and goes up and down. The valve in internal combustion engines regulates the passage of gas or liquid fuels in piping systems. Adjusts the fuel-air mixture in engines or just the air intake to the engine. The valves used in the automobiles control the fuel and air inlet and outlet of the engine with their commute movements. When the intake valve is opened, while the fuel-air mixture enters the engine cylinder, when the exhaust valve is opened, the exhaust gas formed after the fuel-air mixture burns out. When both valves are closed, the integrity of the cylinder is ensured and burning occurs.

It discharges the gas that comes out after this combustion process with the exhaust valve.

Valves are mechanically and thermally resistant parts and are resistant to rust. In the valve, mechanical stresses occur during the ignition of the valve head and during the valve closing.

These tensions are prevented by making the valve in the correct form and strength. There is a very heavy heat load on the surface of the valves from the combustion chamber. When the valves are open, the exhaust valve is also exposed to heat with the exhaust gas at the time of the exhaust.

The cooling of the valves takes place thanks to the heat transfer between the valve seat surface and the cylinder head. There is very little heat transfer by Guide-ways. Intake valves can reach temperatures of 300 °C to 500 °C during operation, while exhaust valves can reach temperatures of 1000 °C.

Operating Environment

Due to the high temperatures in the environments where the valves operate, their length is observed. To eliminate this problem, the valves are placed on the engine with a certain setting. Although this setting varies for each engine, its logic is the same. While the valve is placed on the engine, a certain space is left according to the engine.

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