Answer :
D. Spring
The spring keeps the valve closed, and also keeps the valve assembly in contact with the camshaft or rocker arm when the valve is open.
The spring keeps the valve closed, and also keeps the valve assembly in contact with the camshaft or rocker arm when the valve is open.
A spring or a valve spring keeps each valve closed. When the pressure is released, the spring maintains contact between the check valve and the valve or swing arm. It also keeps the valve closed. The valve mechanism must press against with the spring's tension in order to open the valve. The valve spring's tensile strength is crucial.
