Electric valves in what conditions

1, indoor installation or have protective measures outdoor use; 2, outdoor installation, such as wind, sand, rain, sunshine erosion; 3, flammable, explosive gas or dust environment; 4, damp and hot, dry tropics environment; More than 5, pipes, medium temperature up to 480 ℃; 6, the environment temperature is lower than - Below 20 ℃; 7, vulnerable to water or flooding; 8, radioactive substances ( Nuclear and radioactive material test device) The environment; 9, ship, or dock ( Have salt fog, mold, moisture) The environment; 10 and have severe vibration occasions; 11, easy to fire situation;