The principle of making sleeve compensator

The principle of making sleeve compensator
Sleeve compensator generally uses packing seal. One end of the tube is designed with a stuffing box, and the other side is a core tube. The packing is compacted in the stuffing box through the gland. When running, the core tube slides in the stuffing box to achieve compensation. The first generation of the sleeve compensator with packing as the sealing material leaks in the process of use due to wear of the sealing layer, and its fatal disadvantage is to stop using the replacement packing, adding a lot of work to the maintenance of the pipeline.
 
The first generation of sleeve compensator on the basis of the first generation to increase the filler device can be injected, sealant through the pressure from the injection port injection, can be supplemented in the operation of the pipe network to achieve no downtime maintenance. Actual use shows that the sealing performance of the new generation of sleeve compensator has been greatly improved, and the maintenance workload is greatly reduced, but there are still problems that require frequent maintenance. In order to meet the requirements of the cityscape and other aspects, urban heating pipeline network is generally laid underground, underground laying is divided into trench laying and direct burial laying two kinds.
 
Heating pipeline in the trench laying, in order to prevent the surface and underground water leakage, damage the insulation structure of the pipeline in the trench, corrosion of the pipeline, the trench structure should be tight. At present, the domestic common use of reinforced concrete floor, brick shi or rubble. Trench wall, reinforced concrete cover. Casing compensator for pipeline thermal compensation of pipelines laid in the trench, usually in the location of the installation of casing compensator well inspection, in order to facilitate the inspection of casing compensator and injection sealing mud. Therefore, the construction cost and maintenance cost of the whole heating pipeline network are relatively high.
 
In recent years, urban centralized heat supply has been developed. In order to reduce the project cost, most cities have borrowed some experience from Europe and adopted direct buried heating pipes, which saves a lot of building materials and labor costs. When the pipeline adopts direct burial design with compensation, the direct burial corrugated compensator is generally used for pipeline compensation, because the ordinary sleeve compensator needs regular maintenance and cannot be used for direct burial pipeline compensation, while the price of direct burial corrugated compensator is also relatively high.