Valves are used to control gas flow to and from cylinders in automotive internal combustion engines. The most common type of valve used is the poppet valve. The valve itself consists of a disc-shaped head having a stem extending from its centre at one side.
The edge of the head on the side nearest the stem is accurately ground at an angle – usually 45 degrees, but sometimes 30 degrees, to form the seating face. When the valve is closed, the face is pressed in contact with a similarly ground seat. It is the contact conditions and loading at this interface that will have the largest influence on the rate at which valve and seat wear will occur, so understanding these is a key in determining the mechanisms that cause valve recession.
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1 comments:
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