Pneumatic butterfly valve is a relatively large use of industrial pipeline in the important execution unit, through the compressed air as a power source, so as to operate the valve open and close, and the execution speed is very fast, usually only a few seconds can! The pneumatic butterfly valve has the advantages of simple structure, convenient operation and low cost. It can not only be used for quick cutting off, but also can be matched with the valve positioner to accept the relevant signals, so as to achieve the adjustment and control of the pipeline medium pressure, flow, temperature and other parameters!

There are many kinds of pneumatic butterfly valves, which can fully adapt to different working conditions, and can also be customized according to customer needs. The pneumatic fluorine lined butterfly valve and the pneumatic hard seal butterfly valve as two commonly used types, the medium and pressure temperature are not the same, the control form of the two is the same, but the seal structure is completely different, the pneumatic fluorine lined butterfly valve is suitable for sealing and containing corrosive media pipelines, but the pressure and temperature should not be too high, Pneumatic hard seal butterfly valve can be used for a variety of pressure and temperature range, long service life, but the sealing effect is not good!

1. In terms of structure:

Hard seal butterfly valve refers to the two sides of the seal pair are metal materials or hard other materials. The soft sealing butterfly valve is the contact of the two sealing surface can be alone, can also be used in all soft materials, such as fluorine lined butterfly valve that butterfly plate and seat are wrapped with tetrafluoride;

2, from the sealing performance:

Soft seal fluorine lined butterfly valve has the advantage of good sealing performance, the disadvantage is easy to aging, wear, short service life. Hard seal butterfly valve service life is long, but the tightness is relatively poor than the soft seal.

3, From the use of conditions:

Soft seal fluorine lined butterfly valve is used for normal temperature and pressure environment, hard seal butterfly valve can be used for low temperature, normal temperature, high temperature and other environment, generally can do higher pressure, soft seal is not good, but fluorine lined butterfly valve has super corrosion resistance!

4. From the perspective of manufacturing:

As for manufacturing, from the point of view of principle, there is little difference between the two, mainly the difference between the valve seat, soft seal fluorine lined butterfly valve is a non-metallic structure, hard seal butterfly valve is a metal structure, to consider the hardness relationship between the metals, as well as working conditions, what kind of medium and so on.

The selection between pneumatic fluorine lined butterfly valve and pneumatic hard seal butterfly valve is mainly based on process medium, temperature and pressure. The general medium contains solid particles, has wear, or the temperature is higher than 200 degrees, the best choice of hard seal butterfly valve!