The sulfur hexafluoride (SF6) recovery has excellent arc-extinguishing characteristics, insulation properties and good chemical stability. It has been used as an arc-extinguishing medium for high-voltage circuit breakers since the late 1950s. Under the action of electric arc, sulfur hexafluoride will decompose into a variety of substances with strong corrosiveness and toxicity. Therefore, how to carry out the recovery and purification of sulfur hexafluoride quickly and effectively is an inevitable requirement for power system equipment maintenance.

The sulfur hexafluoride (SF6) recovery system includes an SF6 dedicated oil-free compressor, drying filter, dust filter, safety valve and gas pressure gauge, vacuum pump, vacuum gauge, etc. The HP series filters are designed to effectively filter out moisture and trace solid impurities in the gas to prevent them from re-entering the purified gas. The filters have a reasonable structure, facilitating the replacement of adsorbents, and the filter element is easy to replace.

Generally speaking, after the gas recovered from sulfur hexafluoride is filtered by the filtration system, the particle size of dust should be less than 1 micron, and the moisture content should be less than 40 ppm/v (volume ratio). Our HP series filters can fully meet the requirements. The particle size can reach 0.01 micron, the moisture content can reach 2.5 ppm/v, the residual oil content can reach 0.003 mg/m³, the maximum working pressure can reach 35 MPa, and it is corrosion-resistant and high-pressure-resistant.