Classification of Butterfly Valves

Classification of butterfly valves
The butterfly valve is also known as the pirated valve, which is a simple regulating valve. There are many types of butterfly valves. According to classification methods such as structure, sealing surface material, sealing form, and working pressure, they can be divided into different types of butterfly valves.

1. Classified 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. Classified by sealing surface material

(1) Soft sealing butterfly valve

(2) Metal hard seal butterfly valve. The sealing pair is composed of a metal hard material to a metal hard material.

3. Classified by sealing form

(1) Elastic sealing butterfly valve. The specific sealing pressure is generated by the elasticity of the valve seat or the valve plate when the valve plate squeezes the valve seat when the valve is closed.

(2) External torque sealing butterfly valve. The seal specific pressure is generated by the torque applied to the valve shaft.

(3) Automatic sealing butterfly valve. The sealing specific pressure is automatically generated by the medium pressure.

4. Classified by work pressure

(1) Vacuum butterfly valve. Butterfly valves whose working pressure is lower than standard atmospheric pressure.

(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. The butterfly valve whose nominal pressure PN is 10.0∽80.OMPa.

(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℃.

(2) Medium temperature butterfly valve. 120℃ (3) Normal temperature butterfly valve. -40℃ (4) Low temperature butterfly valve. -100℃ (5) Ultra-low temperature butterfly valve. Butterfly valve with t≤-100℃.

6. Classified by connection method

(1) Wafer butterfly valve

(2) Flanged butterfly valve

(3) Lug butterfly valve

(4) Welded butterfly valve