3、 Use electric fusion sleeve
1. Confirm the geographical location of pneumatic ball valve installation: when there is water or moisture on the ground, please change the installation location or completely remove the water or moisture to ensure that the site does not sink. The foundation must be compacted firmly, and then the pipe shall be adjusted to a level position with the ground.
2. Pipe: confirm whether the pipe is cut at a right angle. If not, cut it again.
3. Scrape the surface of pneumatic ball valve and pipe: the connection pipe surface and pipe surface of pneumatic ball valve shall be marked at the position with a length of about 20% when inserting into the connection pipe, and the marked position must be scraped to a thickness of 0.2mm. After scraping the pipe surface, remove the package of the connection sleeve and insert the pipe into the connection pipe completely. (Remove the STOPPER key of the connecting pipe and insert it). Note: Scraping pipe surface is the most important project for using connecting sleeve, so the pipe surface must be scraped clean.

Application of non-metallic contraction joints
The good comprehensive properties of non-metallic contraction joints make them widely used in many engineering fields.
In the pipeline system, if the thermal stress caused by temperature change, the partial stress caused by equipment vibration and fixed support, and the stress caused by system device deflection exist at the same time, the rigid connection mode will inevitably lead to deformation or destruction of the pipeline system at the thinnest place. If flexible non-metallic compensators are used, this kind of destruction can be prevented. This is related to the unique motion mode of non-metallic compensator. These motion modes determine the multi-dimensional displacement performance of non-metallic compensators.
Pressure bearing single wave body and multi wave body compensators play an irreplaceable role in some special working conditions. The electronic weighing scale used in the desulfurization and powder injection system of a steel plant was originally used to compensate equipment and pipelines with metal compensators. Due to the large reverse thrust, the electronic weighing scale was not accurately debugged and could not return to zero and weigh correctly. The ventilation, dust removal, smoke exhaust and air conditioning insulation pipes and equipment with low working pressure usually use the Pingcheng compensator.