1930s, the United States invented the butterfly valve, the 1950s introduced to Japan, the 1960s was widely used in Japan, while in China it is a matter of promotion after the 1970s. The world in general DN300 mm butterfly valve has gradual…

Compact, rugged and lightweight, easy to install, easy to use, maintenance, zero point and span externally adjustable, wide range of migration; suitable for harsh environments around the clock and a variety of corrosive media. Linear 100% …