Hard sealing butterfly valve refers to both sides of the sealing pair are metal material or hard other material referred to as' hard seal. 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; ( The steel may also be cast iron, cast steel, alloy steel can also be surfacing welding, spraying alloy) 。 Soft seal: seal on both sides of a side is the metal material, on the other side is elastic non-metallic materials known as' soft seal. This seal sealing performance is good, but not high temperature resistant, easy to wear and poor machinery. Such as: steel + rubber; Steel + [four fluorine wiki] Polyethylene [ / wiki] ; And so on. Soft seal USES a certain strength, hardness and heat resistance properties of non-metallic materials, sealed 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 can't meet the technological requirements, hard seal can solve! The two seal can complement each other, in terms of sealing soft seal is relatively good, but now hard seal sealing can also meet the requirements of corresponding! 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. The difference of the structure mainly include the following: 1, the difference of structure: soft sealing butterfly valve is in linear hard seal for more more eccentric eccentric single, double and triple eccentric butterfly valve 2, heat resistance, good sealing used in normal temperature environment. Hard seal can be used in low temperature, normal temperature and high temperature environment, pressure: soft seal low-pressure - Atmospheric pressure, hard seal can also be used in high pressure working conditions such as 4, sealing performance: soft sealing and three partial hardness sealing butterfly valve sealing performance is better, triple eccentric butterfly Industrial Valves in high pressure high temperature environment can maintain a good seal. 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 Industrial Valves, and its easy installation, convenient maintenance, the characteristics of simple structure is more obvious. Electric soft sealing butterfly valve, pneumatic sealing butterfly Industrial Valves, hard seal butterfly valve, etc. In a growing number of occasions began to replace the electric gate valves, globe valves, etc. In this paper, the keyword search: the valve
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