Electromagnetic air valve is two tee electromagnetic directional valve, it through the electromagnet (break) electricity,open (closed) to the valve guide hole, make the reversing valve core, realize reversing, accused of fluid used in hydropower station is surrounded with seal, brake and air can also be used for thermal power, machinery, metallurgy, chemical industry, light industry and other departments, working in medium such as water, air, oil pipeline, to realize the remote automatic control. Advantages: 1. Small size, light weight, reliable operation. With manual operation mechanism. 2. The electromagnet coil is operated for a long time with low driving power. 3. Differential pressure type structure has low requirements on medium.