There are several types of pneumatic ball valves. As the most widely used valve, pneumatic ball valves have the most types. A variety of types can meet users' requirements for different media occasions, different temperature environments and different processes in the actual process. The following describes the characteristics of several common pneumatic ball valves, such as floating pneumatic ball valve, fixed pneumatic ball valve, eccentric semi pneumatic ball valve, V-shaped pneumatic ball valve and fluorine lined pneumatic ball valve.

5、 With the development of air separation units to super large scale, the requirements for the diameter of GLOBE valves will be very large. Generally, GLOBE valves with a diameter greater than DN250 are difficult to find in the market, and the price will be much higher. If the butterfly valve is selected, the adjustment performance will be relatively poor, and the small opening cannot be adjusted. Therefore, it is considered to use two pipelines and two valves in parallel at this time. The advantage of this use is that the coordinated control of the two valves has a better light adjustment when the opening is small. At the initial stage of equipment start-up, use one valve for adjustment; Under normal working conditions, one valve is fully opened and regulated by the other valve.