This kind of valve is suitable for industries of food stuff, pharmacy, petrochemical, electric power, steel, industrial environment protection water treatment and building construction. It is an ideal device for flux adjustment and cut in water supply & drainage pipeline. Standard for design and manufacture Design standard: GB/T 12238 Flange standard: GB/T 9113.1 GB/T 9115.1 GB/T 9115.2 Structure length: GB/T 12221 Pressure test: GB/T 13927, JB/T 9092 Applicable medium: Water, steam, oil, acid corrosive and so on. Applicable temperature: Carbon steel: -29-425 Stainless steel:-40-600 Materials for main parts Body: Cast iron, cast steel, stainless steel, Cr. Mo. Steel, alloy steel Disc: cast steel, stainless steel, Cr. Mo. Steel, alloy steel Seat seal ring : stainless steel, multiple layers, polyester lactone , wear resisting material Stem : 2Cr13.1 Cr13 Stainless steel, Cr. Mo. steel Packing : Flexible graphite. Carton case.