1
What is?
is a seal, usually by the outer frame and co-vulcanized fluororubber oil seal diameter mouth portion is attached to a self-tightening spring steel or, for an engine valve guide seal bars.
2
Function
can prevent the oil from entering into the exhaust pipe, resulting in the loss of oil, a mixed gas of gasoline and air to prevent the leakage of exhaust gas and prevent the engine oil into the combustion chamber. Valve seal is one of the important parts of the engine valve train, in contact with the petrol and oil at an elevated temperature. Therefore need excellent heat resistance and oil resistance material, typically made of rubber is fluorine.
