11Types of butterfly valves and their characteristics

There are many types of butterfly valves. 

1.Classified by structure

(1) Centerline butterfly valve

(2) Single eccentric butterfly valve

(3) Double eccentric butterfly valve

(4) Triple eccentric butterfly valve

2.Classified by sealing surface material

(1) Soft seal butterfly valve.

a. The sealing is composed of non-metallic soft material to non-metallic soft material.

b. The sealing is composed of metal material and non-metal material.

(2) Metal seal butterfly valve. The sealing is made of metal to metal.

3.Classified by sealing form

(1) Forced seal butterfly valve

a.Elastic sealing butterfly valve.The sealing specific pressure is generated by the valve plate pressing the valve seat when the valve is closed.

b.Applied torque sealing butterfly valve.The specific pressure of the seal 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 valve plate.

(3) Automatic 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 disc valve. Butterfly valve with 120 C<t<450 C

Normal temperature butterfly valve. Butterfly valve with 40C<t<120C

(4) Cryogenic butterfly valve. Butterfly valve with 100<t< 40 C

(E) Cryogenic butterfly valve. Butterfly valve with t<-100 C

6.Classified by Connection

(1) Wafer butterfly valve.

(2) Flanged butterfly valve.

(3) Lug type butterfly valve.

(4) Welded butterfly valve.

flanged butterfly valve
lug type butterfly valve
wafer butterfly valve

Post time: Mar-27-2023