Liyang Enterprise Co., Ltd. has been cooperating with professional valve seal manufacturers for a long time, specializing in manufacturing and supplying valve seal housings for nearly 30 years. Because of our professionalism, we are trustworthy. Valve stem seal (Valve stem seal) has three major roles: one is to prevent the gasoline and air mixture and exhaust leakage, the second is to prevent the oil into the combustion chamber, the third is to prevent the oil into the exhaust pipe. Therefore, its precision requirements are very high.