Classified by structure:
(1) Center sealing butterfly valve (2) Single eccentric sealing coal valve (3) Double eccentric sealing butterfly valve (4) Three eccentric sealing butterfly valve is classified according to 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.
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, the valve seat or the valve plate is elastic. 2) The torque sealing butterfly valve is applied. 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.
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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