2. It is simple to operate. Compared with chemical plants, which have strict control requirements, it has great benefits. It reduces the technical requirements for chemical plant employees. Compared with ordinary control valves, it is easier to control, convenient for employees to operate, and reduces the probability of loss due to improper operation. Compared with ordinary control valves, it is more suitable for chemical plants. 　　

As for sealing, pneumatic butterfly valves have two types of seals: elastic seal and metal seal. The former is for the purpose of valve sealing. Generally, the seal ring will be embedded around the butterfly plate or on the valve body. As for the valve with metal seal, its service life will be longer than that of elastic seal, but it cannot be completely sealed. In the working environment with high temperature, metal sealing is a very practical method, while elastic sealing is subject to temperature restrictions.