The solenoid valve, code 1684052-1.1, is an electrically actuated control valve used in the MAN L21/31 engine to regulate the flow of air, fuel, or hydraulic media based on control signals. By converting electrical input into precise mechanical movement, it enables fast and accurate system response, supporting automated engine control, safety functions, and monitoring systems. Designed for continuous operation, this valve offers high reliability, quick switching times, and resistance to harsh operating conditions commonly found in marine propulsion and stationary power applications.