1. According to the driving mode: electric butterfly valve, pneumatic butterfly valve, hydraulic butterfly valve, manual butterfly valve.
2. According to the structure: centre seal butterfly valve, single eccentric seal butterfly valve, double eccentric seal butterfly valve, three eccentric seal butterfly valve.
3. According to the sealing surface material: soft seal butterfly valve, metal hard seal butterfly valve.
4. According to the sealing form:
(1) forced seal butterfly valve. Elastic seal butterfly valve: sealing specific pressure by the valve plate extrusion valve seat when the valve is closed, the valve seat or valve plate elasticity generated. Addition of torque seal butterfly valve: sealing specific pressure is generated by the torque added to the valve shaft.
(2) Pressure-filled seal butterfly valve: sealing pressure generated by the valve seat or valve plate on the elastic sealing element pressure.
(3) automatic sealing butterfly valve: sealing pressure is generated automatically by the medium pressure.
5. According to the working pressure:
(1) vacuum butterfly valve: working pressure below the standard pile of atmospheric pressure butterfly valve.
(2) low-pressure butterfly valve: nominal pressure PN <1.6MPa butterfly valve.
(3) medium pressure butterfly valve: nominal pressure PN 2.5 - 6.4MPa butterfly valve.
(4) high-pressure butterfly valve: nominal pressure PN 10.0 - 80.0MPa butterfly valve.
(5) ultra-high pressure butterfly valve: nominal pressure PN> 100MPa butterfly valve.
6. According to the operating temperature:
(1) high temperature: t>450 ° C butterfly valve.
(2)Medium temperature butterfly valve: 120 C<t<450 ℃ butterfly valve.
(3) Normal temperature butterfly valve: -40 ° C < t < 120 ° C butterfly valve.
(4)Cryogenic butterfly valve: -100<t<-40 °c butterfly valve.
(5) ultra-low temperature butterfly valve: t <-100 ° C butterfly valve.
7. According to the connection mode:
(1) Wafer Type Butterfly Valve: Wafer Type Butterfly Valve's butterfly plate is installed in the diameter direction of the pipeline. The valve is fully open. Wafer Type Butterfly Valve simple structure, small size, light weight.
(2) flanged butterfly valve: flanged butterfly valve for the vertical plate structure, stem for the integral metal hard seal valve sealing ring for the flexible graphite plate and stainless steel plate composite structure, installed in the valve body, butterfly plate sealing surface surfaces surfacing stainless steel. The sealing ring of the soft seal valve is made of nitrile rubber, which is installed on the butterfly plate.
(3)Lug type butterfly valve.
(4) welded butterfly valve: welded butterfly valve is a non-closed type butterfly valve, widely used in building materials, metallurgy, mining, electric power and other production processes in the medium temperature ≤ 300 ℃ nominal pressure of 0.1Mpa pipeline, used to connect, open and close, or regulate the amount of media.