Structure Principle of Polyethylene Ball Valve for China Gas Pipeline
November 30 02:00:51, 2024
1, 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, 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 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 type of material, and masterbatches can not be used. Material color is generally black and yellow. 3, the type of structure Polyethylene gas valve is generally a ball valve, divided into small polyethylene valve (SD63 below) and large polyethylene valve (SD63 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, 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 high and 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, 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. This article Keywords Search: More Valves Technical Articles Pipeline Product Information
The main function of the edge banding is to seal the cross-section of the board, so as to avoid the damage of the board and the adverse factors (mainly moisture) in the process of use and prevent the formaldehyde inside the board from volatilizing, and at the same time achieve the effect of beautiful decoration.
The product has the following main features: smooth surface, no blistering, no ribbing, moderate gloss, smooth surface and back surface, uniform thickness, uniform width, reasonable hardness, high elasticity, good quality, strong wear resistance, trimmed and sealed The color of the side and the side is close to the surface color, not whitish, good gloss, and the overall color of the finished furniture is coordinated.
The role of edge banding:
First, the edge banding has the function of blocking harmful gases such as formaldehyde
Good edge banding or multi-sided edge banding can reduce the amount of formaldehyde emission per unit time (ie, slow down the emission rate). It is worth noting that edge banding will not reduce the formaldehyde content of the board, but this has the advantage of edge banding. It can reduce the formaldehyde emission per unit time of unenvironmentally-friendly sheets to a level that is acceptable to humans and does not affect health.
Second, the role of beautifying furniture
Good edge banding has the effect of beautifying office furniture, but if it is to be beautiful, the requirements for edge banding will be higher. Not only must the edge banding and the end surface of the board be firmly and smoothly combined, but also that the edge banding must be combined with other The joints of the surfaces should not have defects such as bottoming, chipping, and large gaps, and the transition should be natural, smooth and smooth.
Third, extend the service life of office furniture
The precise edge sealing design of the board can prevent water or other liquids from entering the board, avoiding the expansion, deformation and breeding of bacteria on the desktop, thereby prolonging the service life of the office furniture, and the office furniture after the edge sealing treatment is also more expensive in terms of cleaning easy.
Fourth, avoid sharp edges and corners from hurting people's bodies
The general edge banding will use the dull edge banding design to smooth the corners of the table, thereby reducing the damage to the body by the sharp corners
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