What do softback seated butterfly valve and hardback seated butterfly valve mean?-Belo Valve

The hardback seated butterfly valve and softback seated butterfly valve both refer to the soft sealing butterfly valve. Both types kind of sealing seat(no matter hardback seat or softback seat) can achieve zero leakage, they almost have the same long service life, even in terms of price, the hardback seated butterfly valve is cheaper than the softback seated butterfly valve. 

What is the difference between hardback seated butterfly valve and softback seated butterfly valve?

that is what we are going to discuss today: 

The hardback seated butterfly valve and softback seated butterfly valve have different assembly technology. The hardback seat is pressed into the valve body by the butterfly valve assembly machine, which is not easy to replace; while the softback seat can be manually disassembled and replaced;