How to control the opening of the nominal diameter of the electric flange expansion butterfly valve? There are many factors affecting the sealing performance of pneumatic ball valve, such as the coaxiality between the pneumatic ball valve, upper valve stem and lower valve stem. The roundness and smoothness of the ball, the roundness of the 90 degree conical surface of the valve seat, the preload of the O-ring of the valve seat, the preload of the compression spring, etc. Therefore, how to solve these problems has become the key to the sealing of pneumatic ball valves.
、 Valves are widely used in the water treatment industry, mainly low-pressure valves, such as butterfly valves, gate valves and check valves. It is understood that there are more than 2000 valve enterprises with a certain scale in the market at present, most of which are located in Jiangsu, Zhejiang and Central Plains. Due to the relatively low technical content requirements of products, the competition is more intense.
