Ball valves are best used for fast-acting stop/start applications. They are considered quick-acting because they only require a 90° turn of the handle to operate the valve. The quarter turn minimizes valve operation time and decreases the possibility of leakage due to wear. Ball valves are available in a floating ball design and trunnion mounted design.They are widely used in petroleum refining, long-distance pipelines, chemical, papermaking , water conservation, electric power, steel industry and other industries.