The difference in softness and hardness of sealed butterfly valves
Hard seal: A seal where both sides of the sealing pair are made of metal or other harder materials is called a "hard seal". This type of seal has poor sealing performance, but it is heat-resistant, wear-resistant, and has good mechanical properties. electric butterfly valve.
Soft seal refers to one side of the sealing pair being made of a material with relatively low hardness. Generally speaking, the soft seal seat is made of non-metallic materials with certain strength, hardness, and temperature resistance. It has good sealing performance and can achieve zero leakage, but its lifespan and adaptability to temperature are relatively poor.
Metal hard sealed butterfly valves are made of metal and have relatively poor sealing performance, although some manufacturers claim to achieve zero leakage.
Soft seals cannot meet the process requirements for some corrosive materials, while hard seals can solve the problem!
These two types of seals can complement each other. In terms of sealing performance, soft seals are relatively better, but now the sealing performance of hard seals can also meet the corresponding requirements!
The advantage of soft sealing is good sealing performance, but the disadvantage is easy aging, wear, and short service life. Hard seals have a long service life, but their sealing performance is relatively inferior to soft seals.
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