Precautions for Using Bag Filters

Bag filters are relatively simple to use. During operation, you only need to install filter bags of the required fineness grade inside the filter housing, check whether the O-ring seal is intact, and then tighten the annular bolts on the housing cover. After these steps, the filter can be put into normal operation. Once the filtration pump is started, the pressure gauge on the filter will gradually rise, with the initial pressure typically around 0.05 MPa. As the filtration process continues, more residue will accumulate inside the filter housing. When the pressure reaches 0.4 MPa, it is necessary to stop the machine, open the housing cover, and inspect the residue buildup on the filter bag. If the filter bag is damaged, it can be replaced, and the filter can continue to be used.

The pressure of a bag filter is generally best maintained between 0.1 and 0.3 MPa. This can be adjusted using the return pipeline or the return valve on the pump. Excessive pressure can cause damage to the filter bag and the protective screen, so special attention should be paid to this.

Both the inlet and outlet pipes of the bag filter are equipped with pressure gauges. The filter bags should be replaced based on the pressure readings displayed. Typically, filter bags can withstand a pressure differential of about 0.5 to 1 kg/cm². When the pressure differential reaches this range, the filter bags should be replaced promptly to prevent them from rupturing, which could affect filtration efficiency and lead to greater losses.