1 Overview
Underground gas pipe network in the city system, polyethylene (PE) pipes are more and more applications. As with life, with the performance, welding is simple, good sealing performance, easy to use ball valve of polyethylene pipes have been indispensable to the control as more and more use of components and attention.

2, material selection
Polyethylene is a thermoplastic engineering plastic material, has certain strength, stiffness, toughness, impact resistance, corrosion resistance and wears resistance. By controlling the polymerization process and in the polymerization by adding a certain amount of co monomer, you can adjust or improve the performance of polyethylene material. Therefore, advanced polymerization process or a direct result of differences in material properties. For long-term safe operation of pipeline systems, gas pipes, fittings and valves must be graded according to the type of material Pipe Compound (PE80, PE100), and mixed ingredients, can not use the master batch. Material color is generally black and yellow.

3, type structure
Polyethylene gas valve with the valve is generally divided into small polyethylene valve (SD63 below) and large polyethylene valves (SD63 or more, with SD63). No small polyethylene valves generally bleeding mouth, large polyethylene valve can be used according to need no, set one or set two elution mouths.

4 Features
(1) Resistant to corrosion. Polyethylene is inert material, except for a few strong oxidants, can be resistant to the erosion of a variety of chemical media. Electrochemical corrosion-free, no coating.
(2) No leakage. Polyethylene brass ball valve body and the end of the connection pipe connecting part mainly fusion (fusing connection or fused connection), weld width, sealing performance. Type joints with rubber rings or other mechanical joints compared to joints do not exist because of the risk of distortion caused by external leakage.
(3) High toughness. Polyethylene is a highly ductile material, the elongation at break generally more than 500%, based on management