... , factory, mill, supplier, cheapNon-rising Knife Gate ValveIt’s changeable rubber ring knife gate valves seal principle mainly through ... at random, which improves the valve efficiency greatly. It’s a cost-effective, high-performance product.Size Range: 2"-80 ... rating: class 125 to 150; PN6-PN16Standard compliance: MSS SP-81Main material: stainless steel, carbon steel, cast ironDisc: 2Cr13, ...