The characteristics of butterfly valve

 

Folding main classification
According to the drive mode

(1) Electric butterfly valve

(2) pneumatic butterfly valve

(3) hydraulically operated butterfly valve

(4) Manual butterfly valve

According to the structure form:

(1) central seal butterfly valve

(2) single eccentric seal butterfly valve

(3) double eccentric seal butterfly valve

(4) three eccentric seal butterfly valve

Sealing surface material:

(1) soft seal butterfly valve.

1) The sealing pair is composed of non-metallic soft material to non-metallic soft material.

2) The sealing pair is composed of metallic hard material and non-metallic soft material.

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

According to the sealed form:

(1) forced seal butterfly valve.

1) elastic seal butterfly valve: sealing specific pressure is produced by the valve plate extrusion seat when the valve is closed, and the elasticity of the valve seat or valve plate.

2) Applied torque seal butterfly valve: the sealing pressure is generated by the torque applied on the valve shaft.

(2) Charging and sealing butterfly valve: the sealing specific pressure is generated by the charging pressure of the spring sealing element on the seat or valve plate.

(3) automatic sealing butterfly valve: the sealing pressure is automatically generated by the medium pressure.

According to working pressure:

(1) Vacuum butterfly valve. Butterfly valve with working pressure lower than standard stack atmospheric pressure.

(2) low pressure butterfly valve. Butterfly valve with nominal pressure PN<1.6MPa.

(3) medium pressure butterfly valve. Nominal pressure PN 2.5- 6.4MPa butterfly valve.

(4) high pressure butterfly valve. The nominal pressure PN is 10. 0- 80.0MPa butterfly valve.

(5) ultra-high pressure butterfly valve. Butterfly valve with nominal pressure PN>100MPa.

According to the working temperature:

(1) high temperature. Butterfly valve with t>450 °C.

(2) medium temperature butterfly valve. 120 C<t<450 ℃="" butterfly="" valve.<="" span=""></t<450>

(3) Butterfly valve at room temperature. A 40C<t<120 °c="" butterfly="" valve.<="" span=""></t<120>

(4) Low temperature butterfly valve. A 100<t< 40="" °c="" butterfly="" valve.<="" span=""></t<>

(5) ultra-low temperature butterfly valve. Butterfly valve with t< 100 °C.

According to the connection mode:

1. Wafer butterfly valve

The butterfly plate of the wafer butterfly valve is installed in the diameter direction of the pipe. The valve is fully open.

The butterfly valve has the advantages of simple structure, small volume and light weight. Butterfly valve has two types of elastic seal and metal seal. Elastic seal valve, sealing ring can be mounted on the body or attached to the butterfly plate around.

2. Flanged butterfly valve

Flanged butterfly valve for vertical plate structure, the valve stem for the integral metal hard seal valve sealing ring

Flexible graphite plate and stainless steel plate composite structure, installed on the valve body, butterfly plate sealing surface welding stainless steel. The sealing ring of the soft seal valve is made of nitrile rubber and is mounted on the butterfly plate.

3. Lug butterfly valve

4, welding butterfly valve

Welding butterfly valve is a kind of non-closed butterfly valve, widely used in building materials, metallurgy, mining, electric power and other production process medium temperature ≤300℃ nominal pressure of 0.1Mpa pipeline, used to connect, open and close or adjust the medium quality.

Electric regulating butterfly valve belongs to a variety of electric valves and electric regulating valves. The connection mode mainly includes: flange type and clip type, which is an important execution unit in the field of industrial automation control. Electric adjustment butterfly valve installation points two major analysis: installation position, height, import and export direction must meet the design requirements, pay attention to the direction of the medium flow should be consistent with the arrow direction marked by the valve body, the connection should be firm and tight. The appearance of electric adjustment butterfly valve must be checked before installation, and the nameplate of the valve should comply with the provisions of the current national standard "General Valve Logo" GB12220. For working pressure greater than 1.0MPa and in the main pipe to cut off the function of the valve, should be installed before the strength and strict performance test. Qualified only to use. During the strength test, the test pressure is 1.5 times of the nominal pressure, and the duration is not less than 5min. The valve shell and packing shall be qualified without leakage. Electric adjustment butterfly valve according to the structure can be divided into bias plate, vertical plate, oblique plate and lever type; According to the sealing form can be divided into soft sealing type and hard sealing type two; Soft seal type is usually rubber ring seal, hard seal type is usually metal ring seal.