As the non-stop filtering, the dust stick to the filter bag accumulated continuously, cause the equipment resistance up to one designed value (generally is 1200Pa), Time Relay or Micro Pressure Controller will output the signal, make the controller start to work, consequently open the pulse valves make the compressed air sprayed into the filter bag via the spray tube rapidly and immediately, the rapid reverse air flow will make the filter bag expand suddenly, the sticked dust will fall off and down to the hopper or silo. Lastly, the dust will be discharged out by the flap valve or conveyer.

When in the reverse spray cleaning process, will spray the filter bag row by row gradually, when one in work, the others are in the filtering process.