The quality of valves produced in Anning, Jinan, Shandong Province is very good. The valves produced in Anning, Jinan, Shandong Province are made of imported materials, with low failure rate, high strength, low exhaust resistance and good exhaust elimination effect. The valve is specially responsible for inputting air into the engine and discharging exhaust gas after combustion. From the engine structure, it is divided into intake valve and exhaust valve.