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The valve is mainly installed in water conservancy, electricity,water supply and drainage and other types of pumping station pump outlet,with check valve and butterfly valve function,the use of liquid control system to control valve opening and closing.1, the valve has fast opening, fast closing and the end of about 10 degrees to start slow closure.2,because of the slow-closing function, with the elimination of water hammer function.link:http://www.sijiindustrial.com