1
Function
in accordance with the requirements of the working cycle and in each cylinder firing order for the engine, the timing of opening and closing each cylinder intake and exhaust valves, so that fresh air or combustible mixture into the cylinder in a timely fashion, the exhaust gas discharged from the cylinder in a timely fashion. In the compression and power stroke, closing the valve to ensure the sealing of the combustion chamber.
2
Composition
mainly by the camshaft, the valve rocker arm, rocker arm shaft, and valve and valve guides and other components.
3
Type
valve means may be classified from different angles. Press arrangement into OHV valve and a valve side-mounted; divided by the arrangement of the mounted position of the camshaft, and mounted on the mounted; transmissibly into the crankshaft and camshaft gear type, belt and chain drive of formula transmission type; the number of cylinders for each sub-valve, the valve has two and four-valve type.
