[VIP第7年] 指数:7
通过认证 
The valve oil seal can prevent oil from entering the inlet and exhaust pipe, avoid oil loss, prevent the mixture of gasoline and air and exhaust gas leakage, prevent engine oil from entering the combustion chamber. Valve oil seal is one of the important parts of engine valve group. It contacts with gasoline and oil at high temperature, so it needs to use materials with good heat resistance and oil resistance, generally made of fluorine rubber.
