1, polyethylene ball valve overview In the city underground gas pipe network system, polyethylene (PE) pipe is more and more applications. As its same life, same performance, simple welding, sealing performance, easy to use polyethylene ball valve has become an indispensable pipe control components are more and more use and attention. 2, polyethylene ball valve material selection Polyethylene is a thermoplastic plastic engineering materials, has a certain strength, stiffness, toughness, impact resistance, corrosion resistance and wear resistance. By controlling the polymerization process and adding a certain amount of comonomer during polymerization, the properties of the polyethylene material can be adjusted or improved. Therefore, the advanced polymerization process directly lead to differences in material properties. In order to ensure the long-term safe operation of the pipe network system, gas pipe, fittings and valves must be made of pipe materials (PE80, PE100) and compound materials classified according to the material type, and masterbatches can not be used. Material color is generally black and yellow. 3, the type of polyethylene ball valve structure Polyethylene gas valve is generally a ball valve, divided into small polyethylene valves (SD63 below) and large polyethylene valves (SD63 and above, with SD63). Small polyethylene valves generally do not set off the release port, large polyethylene valves can be used according to need not set, set 1 or set 2 discharge port. 4, polyethylene ball valve performance characteristics (1) corrosion-resistant. Polyethylene is an inert material, with the exception of a few strong oxidizers, resistant to the attack of many chemical agents. No electrochemical corrosion, no coating required. (2) No leakage. Polyethylene valve body and the end of the pipe connecting the main welding connection (hot melt or fused connection), welding wide, excellent sealing performance. Compared with rubber ring joints or other mechanical joints, there is no risk of external leakage due to joint twisting. (3) high toughness. Polyethylene is a highly ductile material with an elongation at break of more than 500% and very good adaptability to uneven subsidence of the pipe. Is also a good seismic performance of the pipeline. (4) long service life. Polyethylene material can be used for more than 50 years, which is determined by the long-term hydrostatic design basis value (HDB) based on the circumferential tensile strength of polyethylene pipe and has been confirmed by international standards. (5) Construction is convenient. Polyethylene valves are lightweight compared to metal valves and are easy to install. Opening and closing easy, small operating torque. Valve for the entire path, the pressure loss is small. 5, the application of polyethylene ball valve high, medium pressure polyethylene pipe supervisor should be set segmented polyethylene valves, and should be set on both sides of the valve discharge tube. Polyethylene valves should also be set up at the starting point of high and medium pressure polyethylene gas pipe branch pipes, and discharge pipes can be arranged on one side. Polyethylene ball valve is mainly buried in the density polyethylene pipe supporting the transport and cut off a variety of gas medium flow. The valve can be buried directly in the ground, just install a very simple sheath, opening and closing seat parts, you can use a special wrench on the ground to perform opening and closing operations, polyethylene ball valve for the media in line with national standards of purified natural gas, Liquefied petroleum gas and artificial gas and so on. 6, Conclusion Polyethylene ball valve opening and closing of the small torque, corrosion-free valve, without maintenance and repair, service life of 50 years, increased polyethylene pipe network system integrity. Integral body, eliminating the possibility of leakage, the polyethylene ball valve and polyethylene pipe connection, no need to set the valve well, direct burial construction, the body end pipe can be connected using butt welding or electric welding method, the valve open, Close on the ground operation, than the traditional comprehensive economic benefits of metal ball valve about 2 times. Polyethylene pipe with excellent performance, with the further study of polyethylene materials and development, polyethylene pipes and valves will have better applications.
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