Hebei PPH Plastic Coated Flange Wholesaler, Supplier, Processing, Sales, Customization [Zhenjiang Chenghua Pipe Industry Co., Ltd.] PPH Pipe Flange (Flange) is also known as PPH Pipe Flange Dish or Riser. The PPH Pipe Flange is a component that connects pipes to each other and to valves, attaching to the pipe ends. The PPH Pipe Flange has holes, and bolts secure the two PPH Pipe Flanges together. A gasket is used to seal between PPH Pipe Flanges. PPH Pipe Flanges are available in threaded connection (threaded) PPH Pipe Flanges, welded PPH Pipe Flanges, and ferrule PPH Pipe Flanges. They can be categorized by the connected parts as vessel PPH Pipe Flanges and pipe PPH Pipe Flanges; and by structural type, as integral PPH Pipe Flanges, sliding PPH Pipe Flanges, and threaded PPH Pipe Flanges. Common integral PPH Pipe Flanges include flat-welded PPH Pipe Flanges and socket-welded PPH Pipe Flanges. Flat-welded PPH Pipe Flanges have lower rigidity and are suitable for pressures p≤4MPa; socket-welded PPH Pipe Flanges, also known as high-neck PPH Pipe Flanges, have greater rigidity and are suitable for high-pressure and high-temperature conditions. There are three types of sealing surfaces for PPH Pipe Flanges: flat sealing surface, suitable for low-pressure, non-toxic medium conditions; concave-convex sealing surface, suitable for slightly higher pressure conditions; and tongue-and-groove sealing surface, suitable for flammable, explosive, toxic media, and high-pressure conditions.