Valve Stem Seal

The piston including Piston Crown and Piston Skirt ,the piston in direct contact with the high temperature gas instantaneous temperature can reach 2500K above, therefore, is serious, and the radiation condition is very poor, so the piston when the temperature is high, top up to 600 ~ 700K, and the temperature distribution is not uniform; piston the top under air pressure, especially the power stroke gasoline engine maximum pressure, up to 3 ~ 5MPa, the diesel engine is up to 6 ~ 9MPa,...