4、 Advantages of electric control valve: In addition to the features of high reliability, full function and ultralight, electric control valve also has the following advantages:
⑴ The power supply is convenient and economical, which saves a series of costs for establishing the gas source station.
⑵ The complicated way of "pneumatic valve+electric valve positioner+air source" not only increases the cost, but also brings about a decline in reliability (the more links, the more factors of poor reliability increase).
⑶ From the economic point of view, in addition to the cost of the gas source station, it also saves the cost of the electric valve positioner: a good imported electric valve positioner is usually more than 5000~6000 yuan, preferably at the price of 8000~10000, which can basically buy back the above highly reliable electronic actuator.
⑷ The links are reduced, and the maintenance workload is reduced accordingly.

Pneumatic butterfly valve has been widely used in the chemical industry, and its application effect is also very good. Its application is no longer covered with yarn, and gradually presents a clear context. Its use advantages, such as simple and excellent structure, simple operation, and easy maintenance, are all worthy of confirmation. Its development can be said to be smooth, so how about its future development? Will it be based on the principle that a full moon will lead to a loss? Or will there be better breakthroughs and leaps based on the good development? However, from the development conditions of pneumatic butterfly valve, its development prospects are very good. Next, I will analyze where the development of pneumatic butterfly valve will go.