Butterfly Valve, Flange Adaptor, Dismantling Joint manufacturer / supplier in China, offering Factory Made DN40 to DN1600 Universal Flange Adaptor with En Standard, It Is Unnecessary to Maintance. Cost Is Lower Than Other Typies. Resilient Seated (Vulcanized Sleeve) -Wafer Type Butterfly Valve, DN40-DN300 En558; API609; DIN3202 Pn16 Resilient Seated (Vulcanized Sleeve) -Wafer Type Butterfly Valve and so on.