The original factory valves are the key components of the valve mechanism of a Jiefang car engine. They are divided into intake valves and exhaust valves. The intake valve is responsible for allowing fresh air or combustible mixture to enter the cylinder, while the exhaust valve discharges the exhaust gas from the cylinder. They are made of alloy materials that are resistant to high temperatures and wear, and possess excellent thermal stability and mechanical strength. Their shapes and sizes are precisely produced in accordance with the original factory standards, and they precisely fit with the valve seat rings and other components of the engine, ensuring that the engine can intake air fully and exhaust gas thoroughly. This plays a crucial role in enhancing the engine's power performance, economy, and reliability.