The metal seal can adapt to higher working temperature, while the elastic seal has the defect of temperature limitation. Generally speaking, due to the limitation of structural characteristics, pneumatic butterfly valves are not suitable for industries with high temperature, high pressure and high corrosion resistance and wear resistance.

1、 Molecular sieve switching valve is accompanied by higher temperature resistance, higher sealing performance and higher process safety. Three eccentric hard sealing butterfly valve and three Xuan valve have been considered since the previously commonly used high-performance butterfly valve. The improvement of valve performance also brings about a significant increase in price. Appropriate measurement of performance price ratio is also what users need to consider in the early stage of the project. The diameter of the valve has also been expanded to 1m or more.