1、 The oil and natural gas transmission pipeline is an energy supply line. The emergency cut-off valve on the line is a fully welded valve body pipeline pneumatic ball valve, which requires a service life of more than 30 years without maintenance. But the service conditions are very bad: from the Arctic Circle to the equator, from the plateau to the seabed, from the desert to the wilderness; It passes through seismic zones, marshes, permafrost, rivers, lakes and hillsides; Some are erected or directly buried underground; In the field, nobody operates and maintenance is difficult. It bears both internal pressure of the pipeline and external loads, such as foundation settlement, debris flow and earthquake, pipeline temperature stress, as well as potential corrosion and stress corrosion of groundwater.

Nonmetallic compensator is also called fabric compensator and the function of each part
The non-metallic contraction joint, also known as non-metallic compensator and fabric compensator, is a kind of compensator. The data are mainly fiber fabrics, rubber, and other high-temperature resistant data. It can compensate the vibration of fan and air duct operation and pipeline deformation.
Application characteristics of non-metallic contraction joint:
1. For low temperature - 70 ℃ to high temperature 260 ℃;
2. It is resistant to ozone, oxygen, light and climate aging, and has excellent weather resistance for outdoor use, with a service life of up to 10 years;
3. High insulation performance, dielectric constant 3-3.2, breakdown voltage 20-50KV/MM;
4. Good flexibility, large external friction, good elasticity;
5. Multi direction compensation: non-metallic compensator can provide large axial, angular and lateral displacement in a small size range;
6. No reverse thrust: the main materials are glass fiber fabrics and their coated products, which can not be transmitted. The use of non-metallic compensators for non-metallic contraction joints can simplify the design, prevent the use of large supports, and save a lot of data and labor;
7. Noise elimination and shock absorption: It is made of silicone rubber and glass fiber cloth, which has the characteristics of high thermal insulation, shock isolation and noise reduction, resistance to (high) and low temperatures, corrosion resistance, pressure resistance, simple structure, light weight, easy device maintenance, etc. Fiber fabrics and thermal insulation cotton have the function of sound absorption and shock absorption, which can effectively reduce the noise and vibration of boiler, fan and other systems; 8. Excellent high temperature resistance, corrosion resistance and sealing performance: organic silicon, fluorine and other macromolecular materials are used for coating treatment, with excellent high temperature resistance, corrosion resistance and sealing performance; 9. The device is easy to maintain.