The valve uses both hydraulic action of oil as well as pneumatic
pressure of air for its operation. The function of the oil is to open the valve and it utilizes
oil from the lub oil system of the engine which is pumped through a hydraulic pump which is operated with the help of the engine cam.
The role of the air is to assist in valve closure as well as to provide a spring cushioning effect. The air is also mixed with minute quantity of lubricating oil for lubrication purposes as well as the valve guide is kept cool by using this air.
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