1. Classified by structure
(1) Center sealing butterfly valve
(2) Single eccentric sealing coal valve
(3) Double eccentric sealing butterfly valve
(4) Three eccentric sealing valve
2. Classified by sealing surface material
(1) Soft sealing butterfly valve.
1) The sealing pair is made of a non-metallic soft material to a non-metallic soft material.
2) The sealing pair is made of a metal hard material to a non-metallic soft material.
(2) Metal hard seal butterfly valve. The sealing pair is composed of a metal hard material and a metal hard material.
3. Classified by seal
(1) Forced sealing butterfly valve
1) Elastic sealing butterfly valve. The sealing specific pressure is generated by the valve plate pressing the valve seat when the valve is closed, and the valve seat or the valve plate is elasticized.
2) External torque sealing butterfly valve. The seal specific pressure is generated by the torque applied to the valve shaft
(2) Pressure sealing butterfly valve. The sealing specific pressure is generated by the pressure of the elastic sealing element on the valve seat or the valve plate.
(3) Automatic sealing butterfly valve. The seal specific pressure is automatically generated by the medium pressure.
4. Classified by work pressure
(1) Vacuum butterfly valve. A butterfly valve with a working pressure lower than that of the standard atmosphere.
(2) Low pressure butterfly valve. Butterfly valve with nominal pressure PN<1.6MPa.
(3) Medium pressure butterfly valve. The nominal pressure PN is a butterfly valve of 2.5--6.4 MPa.
(4) High pressure disc valve. The nominal pressure PN is a butterfly valve of 10. 0--80.0 MPa.
(5) Ultra high pressure butterfly valve. Butterfly valve with nominal pressure PN>100MPa.
5. Classified by operating temperature
(1) High temperature butterfly valve. t>450C butterfly valve
(2) Medium temperature disc valve. Butterfly valve with 120C<t<450C
(3) Normal temperature butterfly valve. a 40C<t<; 120C butterfly valve
(4) Low temperature butterfly valve. A butterfly valve of 100<t<-40C
(E) Ultra-low temperature butterfly valve. t<100C butterfly valve
6. Classified by connection
(1) Wafer type butterfly valve.
(2) Flanged butterfly valve.
(3) Ear type butterfly valve.
(4) Welded butterfly valve.
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