Valves can be selected according to the control mode: pneumatic, electric, hydraulic, manual, etc.

Valve body materials are generally available: ductile iron, carbon steel, etc. From a cost perspective, ductile iron is generally used more often. If the weather in the north is harsh, carbon steel valve bodies can be considered.

The valve seat is usually lined with rubber, and now the commonly used material is wear-resistant EPDM (ethylene propylene diene monomer).

Valve plate materials available: ductile iron chrome plated, ductile iron lined with nylon, lined with fluororubber, 304, 316, 316L, 2205, 2507, 1.4462, 1.4529, C276, etc. Process water, circulating water, and valve plate materials are generally made of ductile iron chrome plated or 304. Air or oxidized air is plated with chromium or 304 ductile iron. However, when used for oxidizing air valve seats, attention should be paid to the medium temperature. Generally, heat-resistant EPDM is used for valve seats. Medium with high CL ion concentration, such as slurry and wastewater, generally use 2205, 2507, 1.4462, 1.4529, and C276. The higher the concentration of Cl ions, the higher the material of the valve plate. When the general medium is [Cl -] 50000-18000mg/L (PPM) limestone slurry and gypsum slurry, Ni based alloys with strong corrosion resistance can be selected; When recovering water from slurry with a concentration of 3000mg/L<[Cl -]<50000mg/L, super austenitic stainless steel 1.4529 and 254SMO can be selected; Limestone, gypsum slurry or recycled water with [Cl -]<30000mg/L can use duplex stainless steel 2507 and 2205.

The connection methods of butterfly valves can be divided into: clamp, single clamp, flange, etc.

Small diameter butterfly valves are generally connected using clamp or single clamp methods, with a diameter of DN50-DN450. The diameter is within DN500

The above is generally recommended to use flange connections.