Water pipe PE pipe for water supply is a replacement for traditional steel pipe and PVC drinking water pipe. The water supply pipe must withstand a certain pressure, usually a PE resin with a large molecular weight and good mechanical properties, such as HDPE resin. The LDPE resin has low tensile strength, poor pressure resistance, poor rigidity, poor dimensional stability during molding, and difficulty in connection, and is not suitable as a material for a water supply pressure pipe. However, due to its high health indicators, PE, especially HDPE resin, has become a common material for the production of drinking water pipes. HDPE resin has a small melt viscosity, good fluidity and easy processing, and thus has a wide selection range of melt index, and usually MI is between 0.3 and 3 g/10 min. Pipe fitting classification According to the production method of the pipe fittings: injection pipe fittings, welded pipe fittings. According to the construction method and use classification: electric hot melt pipe fittings, hot melt butt fittings, socket fittings, steel-plastic conversion joints. According to engineering habits: sleeve, elbow, tee, saddle tee, variable diameter, end plug, flange, steel-plastic conversion. According to the PE pipe, the pressure is divided into 0.6MPa, 0.8MPa, 1.0MPa, 1.25MPa, 1.6MPa, and MPa is the pressure unit. For example, 0.6MPa means 6kg. According to the diameter of the PE pipe, it can be roughly divided into: 20, 25, 32, 40, 50, 63, 75, 90, 110, 125, 160, 180, 200, 225, 250, 280, 315, 355, 400, 450,500,560,630,710,800,900,1000,1200, the unit is mm or mm, PE pipe diameter refers to the outer diameter, corresponding to the different pressure levels, the wall thickness of the pipe is also different . PE specification PE water supply pipe connection Polyethylene pipes and pipes, pipes and fittings, pipes and fittings, and olefin pipes and fittings between polyethylene pipes and metal pipes are directly connected. The most common connection methods for urban water supply polyethylene pipes are: hot melt connection, electrofusion connection, socket type flexible connection, flange connection, steel-plastic transition joint connection, etc. 1, hot melt connection The hot-melt joint is a special heating tool that heats the polyethylene pipe or pipe to be connected under pressure, melts it, removes the heating tool, presses the two molten faces together, and maintains under stable pressure. For a while, until the joint cools. Hot melt connections include hot melt butt joints, hot melt socket connections, and hot melt saddle connections. 2, fused connection The electrofusion connection is to make a close contact with the connection portion of the pipe or the pipe by the special electrofusion pipe member of the embedded resistance wire, and heat the connection portion through the embedded resistance wire to fuse the fusion to the joint until the joint is cooled. The fused connection can be used to connect polyethylene tubing or socket tubing of different types and different melt flow rates. The fused connection is divided into an electrofusion socket connection and an fused saddle connection. 3, socket type flexible connection The polyethylene pipe socket type flexible connection is a new type of connection method developed with reference to the socket-type flexible connection principle of the cast iron pipe and the polyvinyl chloride pipe (PVCU). It is welded with a reinforced polyethylene bearing at one end of the polyethylene pipe. mouth. The socket type flexible connection is to insert the end of the polyethylene pipe directly into the special socket of the pipe or the pipe fitting. The locking ring in the socket is pressed against the drawing and the rubber sealing ring is pressed tightly to achieve the purpose of connecting the pipe and the pipe fitting. 4, flange connection Flange connection is mainly used for the connection of polyethylene pipes and metal pipes or auxiliary equipment such as valves, flow meters and pressure gauges. Flange connections are mainly composed of polyethylene flange joints, steel or aluminum back pressure loop flanges, steel or aluminum flanges, gaskets or seals, bolts, nuts and so on. Flange connection is achieved by tightening bolts and nuts so that the flange joints are in close contact with the flange pieces for connection purposes. 5, steel-plastic transition joint connection The steel-plastic transition joints are connected by means of cold-pressed or otherwise prefabricated steel-plastic transition joints to connect polyethylene pipes and metal pipes. The steel-plastic transition joint has a pull-out locking ring and a sealing ring. It is usually required to have good sealing performance and resistance to drawing and pressure resistance. It is much larger than the connection method of the polyethylene pipe in the system. Different connection methods are used. With its own advantages and limitations, users can choose the appropriate connection method according to the diameter of the pipe, work pressure, and the place of use. However, it is strictly forbidden to make the pipe thread directly on the polyethylene pipe and pipe fittings in any form, and use threaded connection; Editor in charge: Wang Zhen Screwdriver Bit Set,Torx Screwdriver Set,Multi Screwdriver Set,Impact Screwdriver Set henan horn tools co.,ltd. , https://www.nbhorntoolsltd.com