Soft seal and hard seal butterfly valve is the difference?

Valve is pipeline installation, industrial water pump control velocity of commonly used equipment, there are many kinds of valves, valve butterfly valve is commonly used, for the valve seal, soft seal butterfly valve butterfly valve and the difference between where hard seal butterfly valve? A soft, soft seal butterfly valve butterfly valve sealing refers to: seal on both sides of a side is the metal material, on the other side is elastic non-metallic materials. This seal sealing performance is good, but not high temperature resistant, easy to wear and poor machinery. Such as: steel + rubber; Steel + four fluorine polyethylene, etc. Soft seal USES a certain strength, hardness and heat resistance properties of non-metallic materials, sealing performance is good can achieve zero leakage, but with poor life and adaptability to temperature. Hard seal made of metal sealing performance is relatively poor. Despite the manufacturers claim to achieve zero leakage. Soft seal part of corrosive material is can not meet the requirement of the process. Hard seal can be solved, the two sealing can complement each other. In terms of sealing soft seal is relatively good, but now hard seal sealing also can meet the corresponding requirements. The advantage of soft seal is sealed performance is good, defect is easy ageing, wear and short service life. Hard seal service life is long, but the sealing is relatively worse than soft seal. Two hard seal butterfly valve, hard seal butterfly valve is to point to: both sides of the sealing pair are metal materials or other hard materials. This seal sealing performance is poor, but high temperature resistance, wear resistance, good mechanical performance. Such as: steel + steel; Steel + copper; Steel + graphite; Steel + alloy steel. Here may also be cast iron, cast steel, alloy steel, also may be surfacing welding, spraying alloy. Three, the difference of the structure mainly include the following: 1, the difference of structure: soft sealing butterfly valve is in a more linear, hard seal for more eccentric eccentric single, double and triple eccentric butterfly valve. 2 、密封性能：软密封和三偏心硬密封蝶阀密封性能比较好三偏心蝶阀在高 压高温环境下可以保持良好的密封。 3, temperature tolerance: soft seal used in normal temperature environment. Hard seal can be used in low temperature, normal temperature and high temperature environment. 4, pressure: soft seal low-pressure - Atmospheric pressure, hard seal can also be used in high pressure condition, etc. In view of the above characteristics, soft seal butterfly valve is suitable for the ventilation and dust removal pipe two-way opening and closing and adjustment, water treatment, light industry, petroleum, chemical industry, etc. Hard seal butterfly valve is used for heating, gas supply, and gas, oil, acid and alkali environment. With the wide use of butterfly valve, and its easy installation, convenient maintenance, the characteristics of simple structure is more obvious. Electric soft sealing butterfly valve, pneumatic sealing butterfly valve, hard seal butterfly valve, etc. In a growing number of occasions began to replace the electric gate valves, globe valves, etc.
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