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The difference and selection of fluorine lined butterfly valve and hard seal butterfly valve

Posted by Bundor valve
The difference and selection of fluorine lined butterfly valve and hard seal butterfly valve
Butterfly valve as one of the most commonly used valves in the process pipeline, not only simple structure, easy to operate, with different driving devices, but also to form a variety of control methods, such as electric butterfly valve, hydraulic butterfly valve, pneumatic butterfly valve!And butterfly valve is often used for the occasion of larger caliber and flow, relative to other valves with the same caliber, the cost can be reduced 1.5 ~ 2 times, both economic and practical!
According to the butterfly valve seal form is different, the total can be divided into two categories, a soft seal, a hard seal!The butterfly valve of two kinds of different sealing form, in the pipeline that USES relatively, the effect that plays is not identical also, say from a kind of sense, still exist bigger difference!Users in the selection, the difference between the two should have a detailed understanding and cognition!
Take the most common soft seal lined with fluorine butterfly valve and metal hard seal butterfly valve, lined with fluorine butterfly valve is generally used for the pipeline containing corrosive media, and sealing effect can reach zero leakage, but only suitable for room temperature and pressure!And the hard seal butterfly valve relative to the use of temperature and pressure are higher, but the sealing and corrosion resistance is not as good as the soft seal butterfly valve!

1. From the perspective of structure:
Hard seal butterfly valve refers to the sealing pair on both sides are metal materials or other hard materials.And the soft seal butterfly valve is the contact of the two sealing surface can be separate, but also can all use soft materials, such as lined with fluorine butterfly valve is the butterfly plate and seat are wrapped with tetrafluorin;
2. In terms of sealing performance:
The advantage of soft seal lining fluorine butterfly valve is good sealing performance, the disadvantage is easy to aging, wear, short service life.Hard seal butterfly valves have a long service life, but poor sealing performance relative to soft seal.
3. From the use conditions:
Soft seal lined fluorine butterfly valve for normal temperature and pressure environment, hard seal butterfly valve can be used for low temperature, normal temperature, high temperature environment, generally can do higher pressure, soft seal is not, but lined fluorine butterfly valve has super corrosion resistance!
4. Manufacturing:
As for manufacturing, from the perspective of principle, the difference between the two is not big, mainly the difference of the valve seat, soft seal lining fluorine butterfly valve is a non-metallic structure, hard seal butterfly valve is a metal structure, to consider the hardness between the metal relationship, and working conditions, go what medium and other aspects.