The steel lining pipeline composition is made up of after the welding of the steel parts is completed, the finished PTFE plastic pipe is pulled into the prefabricated straight pipe by mechanical tension, so that the inner lining layer is tightly combined with the steel piece; then it is heated by flame or salt water. The ordinary PTFE tube is sealed to a certain temperature, and the flange is formed into a sealing surface, and then the stress is removed.
2. Product Advantage
The steel-lined PTFE sliding pipe is purely mechanically processed. Compared with other steel-lined PTFE pipes, the steel-lined PTFE pipes are characterized by high density, smooth surface and uniform thickness. "High density" prevents medium penetration and is not easily deformed during use; "smooth surface" makes the flow resistance of the medium small and effectively prevents sticking; "even thickness" makes the steel-lined PTFE pipe high in strength and at the flange Good sealing performance. It is suitable for strong corrosive media such as acid, alkali, strong oxidant and aqua regia at various concentrations.
3. Steel-lined PTFE pipe execution standards
1) Perform HG/T21562-94 "lined PTFE steel pipes and fittings" according to the manufacturing standards.
2) The flanges of pipes and fittings are all flat welded flanges. The flange standard is GB/T9119-2000. It can also be selected according to the requirements of the supplier. The size of the flange sealing surface is manufactured and processed according to the sealing surface size specified by the standard.
3), 20# steel pipe implements HG20533 standard; different diameter pipe and three-way standard are HG/T21635.
4), lining fluorine material selection: PTFE.
5), can withstand strong acid and alkali, PH can reach 1-14.
6), can resist the penetration of small molecular gases, including oxygen, carbon dioxide, chlorine, hydrogen chloride gas.
7), high purity, very low precipitation rate, in line with the purity requirements of the photovoltaic industry.
8), the use of a wide temperature, from ultra low temperature to 150 ° C.
9) The surface is extremely smooth and the coefficient of friction is small.
10), strong mechanical properties, strong, wear resistance.
4.Brief introduction to the process of pushing PTFE pipes
1), welding and surface treatment of steel pipes and flanges: After welding steel pipes and flanges, sandblasting and rusting to Sa2 level, and cleaning impurities, oil and so on.
2), Pull the finished PTFE plastic pipe into the prefabricated straight pipe by mechanical tension to make the inner liner and the steel piece tightly combined.
3), stress relief process:
A. Natural elimination method, due to the straight pipe diameter and the length of the fixed length processing, the stress is restored at room temperature after 2 to 5 days (the effect is good and can withstand micro-negative pressure).
B. Forced elimination method, using electric furnace heating to 180 ° C for 3 hours, natural cooling. (Processing speed is fast, it is recommended not to use in the negative pressure section).
4), molding: by flame heating or salt water heating, so that the F4 tube is sealed to a certain temperature, the flange is formed into a sealing surface.
5),Can be customized according to your requirements.