Difference between Pneumatic Butterfly Valve and Pneumatic Sealing Butterfly Valve

Pneumatic butterfly valve is a relatively large amount of industrial piping in the implementation of an important unit, the use of compressed air as a power source to operate the valve opening and closing, and the execution speed is very fast, usually only takes a few seconds! Pneumatic butterfly valve has the advantages of simple structure, convenient operation and low cost, which not only can be used for quick cutting off, but also can be matched with the valve positioner to receive relevant signals to adjust and control the medium pressure, flow rate and temperature of the pipeline. 


      Pneumatic butterfly valve more types, can be fully adapted to a variety of working conditions, but also according to customer needs, customized butterfly valve products. The pneumatic lining butterfly valve and pneumatic hard sealing butterfly valve as the more commonly used two types of media and pressure temperature are different, both control the same form, but the sealing structure is completely different forms of pneumatic lining fluorine butterfly valve For pipes that require seals and contain corrosive media, 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 life, but the sealing effect is poor! 

      1, from the structure: the 
      hard seal butterfly valve refers to both sides of the seal are metal or harder other materials. The soft sealing butterfly valve is the contact of the two sealing surfaces can be used alone or in all soft materials, such as the fluorine butterfly valve is butterfly valve seat and the valve seat are wrapped with PTFE; 

      2, from the sealing performance: 
      soft sealing fluorine Butterfly valve has the advantage of good sealing performance, the disadvantage is easy to aging, wear and tear, short service life. The life of a hard-sealed butterfly valve is long, but the seal is less flexible than a soft seal. 

      3, from the conditions of use: 
      Soft seal lining fluorine butterfly valve for ambient temperature and pressure environment, the hard seal butterfly valve can be used for low temperature, room temperature, high temperature and other environments, generally can do higher pressure, soft seal is not good, Super corrosion resistance! 

      4, from the manufacturing: 
      As for the manufacturing side, from the principle point of view, the two are not very different, mainly the difference between the valve seat, soft seal fluorine butterfly valve is a non-metallic structure, the hard seal butterfly valve is a metal structure, taking into account the metal The hardness of the relationship, as well as working conditions, what kind of medium to go.
      The pneumatic lining fluorine butterfly valve and pneumatic hard sealing butterfly valve between the selection, mainly based on process media, temperature and pressure, the general medium containing solid particles, with wear, or the temperature is higher than 200 degrees the best choice of hard sealing butterfly valve!