Abstract: Existing problems of the two key apparatus in S Zorb unit, reactor filter and metal-seated ball valve, during operation were analyzed. Countermeasures were proposed and put into practice. For reactor filter, limiting fine particles to reach the filter surface could reduce the load of filter effectively; optimizing blowback parameters to ensure blowback pressure and avoid internal leakage of blowback valve were the key factors for well regeneration of the filter. For metal-seated ball valve, installing metal-seated ball valve, attention should be paid to the direction of ball valve sealing; keeping the pipeline clean and adjusting the process in good conditions could avoid the interruption of program; strengthening the inspection of valves both on-line and off-line; repairing trouble valves in time and reserving a certain number of standby valves could ensure stable long-term operation.

Key words: S Zorb, filter, metal-seated ball valve