Butterfly valve classification

1. Classification by structure (1) center sealing butterfly valve (2) single eccentric sealing butterfly valve (3) double eccentric sealing butterfly valve (4) triple eccentric sealing butterfly valve

2. Classification according to sealing surface material (1) soft seal butterfly valve. 1) The sealing pair is composed of non-metallic soft material to non-metallic soft material. 2) The sealing pair is composed of metal hard material and non-metal soft material. (2) Metal hard seal butterfly valve. The sealing pair is made of metal hard material to metal hard material. 

3. Classification according to sealing form (1) Forced sealing butterfly valve 1) Elastic sealing butterfly valve. The sealing specific pressure is generated by the valve plate squeezing the valve seat when the valve is closed, and the elasticity of the valve seat or valve plate is generated. 2) Applied torque sealing butterfly valve. The sealing specific pressure is generated by the torque applied to the valve shaft (2) Pressure sealing butterfly valve. The sealing specific pressure is generated by pressurizing the elastic sealing element on the valve seat or valve plate (3) Self-sealing butterfly valve. The sealing specific pressure is automatically generated by the medium pressure.

4. Classified by working pressure (1) Vacuum butterfly valve. Butterfly valve with working pressure lower than the standard pile atmospheric calendar. (2) Low pressure butterfly valve. Butterfly valve with nominal pressure PN<1.6MPa. (3) Medium pressure butterfly valve. Butterfly valve with nominal pressure PN of 2.5--6.4MPa. (4) High pressure butterfly valve. Butterfly valve with nominal pressure PN of 10.0--80.0MPa. (5) Ultra-high pressure butterfly valve. Butterfly valve with nominal pressure PN>100MPa. 5. Classified by working temperature (1) High temperature butterfly valve. Butterfly valve with t>450 C (2) medium temperature butterfly valve. 120 C < t < 450 C butterfly valve (3) normal temperature butterfly valve. A 40C<t<; 120C butterfly valve (4) low temperature butterfly valve. A 100<t<-40 C butterfly valve (5) an ultra-low temperature butterfly valve. t < a 100 C butterfly valve 6. Classification by connection method (1) Wafer butterfly valve. (2) Flanged butterfly valve. (3) Lug type butterfly valve. (4) Welded butterfly valve.