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The purpose of the valve spring is to close the valve when the cam has finished pushing it open to allow fuel/air in or exhaust gases out.
The spring is held in place at the top of the valve by a split-collet, like 2 halves of a cone, and also sits against the outside of the cylinder head.
The spring is compressed when the cam on the cam shaft pushes it down, and as the cam moves away, the spring forces the valve shut again.
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