The body material of the desulfurization butterfly valve is: ductile iron, cast steel, stainless steel, etc. From the cost considerations, there are many spheroidal graphite cast irons. If the weather and temperature are considered in the north, the valve body material needs to be cast steel and The above materials.
The valve seat of the desulfurization butterfly valve is generally rubber lining. The commonly used lining material is: EPDM rubber (ethylene propylene diene monomer rubber).
The valve plate material of the desulfurization butterfly valve is optional: ductile iron, stainless steel 304, lining EPDM rubber, 1.4529, 2507 duplex stainless steel and other materials.
The valve plate material of the process water pipe and the circulating water pipe may be made of ductile iron or stainless steel 304.
Lime slurry medium pipelines are generally selected 2507, 14529.
When the Cl ion concentration is high, the valve plate material should be correspondingly increased. When the general medium [ammonia ion] 50000 to 180000mg/L (ppm), the limestone slurry and gypsum slurry can be used with the corrosion resistance of the Ni-based alloy; 3000 mg / L <[CL -] <50000 when circulating water Super austenitic stainless steel 1.4529, 254SMO can be used for milliliters of slurry; [Chloro-] <30000mg / L, limestone, gypsum slurry or recycled water can be used duplex stainless steel 25072205. The connection mode of the desulfurization butterfly valve can be divided into: a pair of clips, a single clip, and a flange.
Small-diameter butterfly valves are generally connected by clips, and the diameter is generally DN50-DN450. More than DN500 caliber is more generally recommended for flange connection.