Sodium filled valve intake and exhaust valve

Valve is a mechanical device in an internal combustion engine that controls the flow of gas in and out of the cylinder. It is usually made of metal and has the function of opening and closing to press the mixed gas or air into the cylinder at the appropriate time, or to discharge the exhaust gas. The opening and closing of the valve is controlled by the camshaft or valve drive device to ensure the normal operation of the engine.