china PL Flange products: It is easy to obtain materials, simple to manufacture, low in cost, and widely used; but its rigidity is poor, so it cannot be used in chemical process piping systems with supply and demand, flammable, explosive, and high vacuum requirements, and highly, extremely hazardous occasions. The sealing surface type has flat surface and raised surface. Due to the good comprehensive performance of china PL Flange products, it is widely used in chemical engineering, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, electric power, aerospace, shipbuilding and other basic projects.

　　China PL Flange products factory believes that another meaning of the national standard flange is: the flange produced according to the size and tolerance range required by the national standard is different from the flange produced not according to the standard size, also known as the second standard flange ( Some people call non-standard flanges incorrect), usually some unscrupulous merchants will reduce the flange thickness and outer diameter to achieve the purpose of saving materials, and use scrap steel or scrap steel to process flanges, usually this kind Steel is a waste whose chemical composition and mechanical properties do not meet the standards. What’s more, the flange is produced by private steelmaking in a black steel factory. The steelmaking technology used in this private steelmaking is outdated and cannot guarantee the mechanical properties and welding performance. It cannot be welded with steel pipes, or there are cracks and pores in the steel itself, and water will leak after welding.

　　Therefore, China PL Flange Products Company recommends that national standard flanges be used as much as possible when purchasing flanges. If the funds are limited and you choose the second standard flange, you must carefully observe and measure the flange size to avoid being fooled.