Sanitary Butterfly Valve quality inspection process

With the development of my country's infrastructure construction, large-scale national projects have been put into construction and implementation, making the number of sanitary valves in power, petroleum, chemical, urban water supply and drainage systems increase, especially the use of sanitary butterfly valves. my country's production of sanitary valve fittings can be divided into two categories from the installation structure, one is the quick-install type, the other is the welding type. The production diameter of sanitary quick-install fittings is generally below DN700, and large diameters mostly use multi-level structures. The sanitary fittings below DN500 are used the most, so users encounter many problems when using them. Here, we summarize the common problems and guide the correct installation and use

It is very necessary for users to do sampling or full inspection on the purchased sanitary quick-install butterfly valves. The purpose of random inspection of product quality is: first, to control the quality of the product, and second, to reduce unnecessary maintenance and updates of sanitary valves after installation, and the success rate of one-time installation is high. However, when users test sanitary valves during random inspections, there are some places that they don't pay attention to, which causes doubts about the quality of the valves or rejections as unqualified. What is the reason? The screws on the pressure ring are 4, 6, 8 and 12 according to the size of the caliber, and the maximum bolt diameter does not exceed M10. These screws are mainly used to fix the elastic valve seat and cannot withstand the full medium pressure. The stainless steel butterfly valve can withstand the full medium force only after it is installed in the pipeline and tightened by the outer flange bolts. Due to structural reasons, there are differences in the inspection operation and leakage occurs during acceptance. It is common for users to notify the manufacturer of unqualified products. After communication, the products can pass smoothly and there are no problems in use. Therefore, here are the matters that should be paid attention to, so that users can better understand and use sanitary valves and pipe fittings.