It is most suitable to choose thermal expansion device for connection in thermal pipeline, because thermal expansion device not only has good heat resistance and expansion and contraction performance, but also has high strength and corrosion resistance as other expansion devices. Most of the thermal expanders are made of ferrous metals, and the main parts working at high temperature and pressure are made of low alloy steel containing chromium and molybdenum. For ultra-high parameter devices, chromium-nickel high-alloy steels containing titanium and tungsten are used.
The thermal expander can expand and contract axially within a certain range, and can also overcome the offset caused by the different axial direction of the pipe butt joint within a certain angle. It greatly facilitates the installation and disassembly of valve pipes. It can expand and contract freely, and at the same time can compensate for the displacement caused by thermal expansion and contraction of high temperature pipeline system. It can be widely used in chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, water supply and drainage, fire fighting, electric power and other basic projects.
