3. When selecting the filter pressure reducing valve, pay attention to the pressure range, flow medium, working temperature, drainage device (self draining, manual draining) and filter element precision of the filter pressure reducing valve.
4. When selecting limit switches, pay attention to whether the feedback mode (mechanical and inductive), the color of position indication and the corresponding explosion-proof grade meet the requirements.

The patented technology of rotary compensator for heat pipes has won commercial success, which has led some illegal manufacturers to plagiarize this technology, stop manufacturing, consumption and sales, and seriously violated the legitimate rights and interests of Mr. Yuan Guoqing. To this end, a statement was issued to prevent some heating enterprises from purchasing infringing products to cause unnecessary trouble.
The application of maintenance free rotary compensator and rotary compensator products relies on the flexible packing in the packing chamber to stop sealing. During the application of the product, the packing will wear a little every time it rotates. When the wear reaches a certain value, the product will leak. The maintenance free rotary compensator has added a set of springs above the packing compression flange. When the packing shows slight wear, it will be compensated by the tension of the compression spring, thus extending the leakage time of the product (the leakage time is delayed by 3-5 years). When the amount of wear exceeds the amount of spring tension compensation, it is only necessary to tighten the nut above the spring compression flange. There is no need to stop air for repair. There is no limit on the number of operations, and leakage is not easy to occur, thus greatly improving the social and economic benefits of gas supply units and gas users. The product will not leak after 5000 times of compensation under the pressure of 4.0Mpa, and the sealing effect is excellent.