Butterfly valve can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structure form. According to the sealing form is divided into two kinds of sealing type and hard sealing type. Soft seal butterfly valve generally use rubber ring seal, hard seal butterfly valve usually use metal ring seal, according to the connection type is divided into flange connection and clamped connection, according to the transmission mode is divided into manual, gear drive, pneumatic, hydraulic and electric several.

Butterfly valves can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to structural form. According to the sealing form is divided into more sealing type and hard sealing type two kinds. Soft seal butterfly valve generally use rubber ring seal, hard seal butterfly valve usually use metal ring seal, according to the connection type is divided into flange connection and clamped connection, according to the transmission mode is divided into manual, gear drive, pneumatic, hydraulic and electric several.

For the butterfly valve types, as well as in special working conditions, corresponding to the use of butterfly valve products are not the same, so for this type of valve, should be with the engineers to select a separate type! Butterfly valve according to the common types and classification can be divided into the following forms:

(A) according to the structural form of classification 

1, center sealed butterfly valve

2, single eccentric seal butterfly valve

3, double eccentric seal butterfly valve

4, three eccentric seal butterfly valve

(B) according to the linkage classification

1, clamped butterfly valve

2, flanged butterfly valve
3, lug type butterfly valve

4, welded butterfly valve
(C) according to the working temperature classification

1, high temperature. t>450 ° C butterfly valve.

2, medium temperature butterfly valve. 120 C

3, room temperature butterfly valve. A 40 C

4, low temperature butterfly valve. A 100
(D) according to the sealing surface material classification

1, soft seal butterfly valve.

(1) sealing vice by non-metallic soft material to non-metallic soft material composition.

(2) sealing vice by metal hard material to non-metallic soft material composition.
2, metal hard seal butterfly valve. Seal vice by metal hard material to metal hard material composition.

(E) according to the working pressure classification

1, vacuum butterfly valve, the working pressure is lower than 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.

(F) according to the seal form classification

1, forced seal butterfly valve.

(1) elastic seal butterfly valve. Seal pressure by the closing valve plate extrusion valve seat, valve seat or valve plate elasticity.

(2) external torque seal butterfly valve. Sealing pressure is generated by the torque applied to the valve shaft.

(2) Pressurized sealing butterfly valve. Seal specific pressure by the valve seat or valve plate on the poppet sealing element pressure generation.

3, automatic sealing butterfly valve. The sealing pressure is generated automatically by the medium pressure.