1. Introduction noun valve seal
valve seal (Valve stem seal) is a seal, usually by the outer frame and co-vulcanized fluororubber oil seal diameter mouth portion is attached to a self-tightening spring or wire, the guide bar for an engine valve seal. Valve seal can be prevented from entering the oil 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, at an elevated temperature in contact with the petrol and oil and therefore require excellent heat resistance and oil resistance material, typically made of rubber is fluorine.
