Bag filter if you want to use it for a long time, you must pay attention to the daily maintenance and maintenance, so as to make it have a longer service life. The following editor will show you how to use and maintain the bag filter~

1. Daily use

   The filter system at work needs to check the pressure difference between the inlet and outlet frequently. When the pressure difference reaches about 0.6 Mpa, the filter bag should be replaced in time to prevent the filter bag from rupturing and the support net from being damaged.

2. Open the filter cover correctly after filtering

   Warning: Do not open the cover when there is pressure in the bag filter, otherwise the remaining liquid may spray out and cause liquid loss and personal injury.    

Therefore, please operate strictly in the following order:

1. Close the input valve; when there is pressure at the outlet, close the output valve.

2. After confirming that the pipe connected to the exhaust valve has been connected to a safe place or suction port (especially pay attention when filtering toxic and corrosive liquids), then open the exhaust valve to prevent the liquid from causing damage to the staff and the surrounding environment. Pollution.

3. Check the pressure gauge to make sure that the internal pressure is 0. At this time, the bag filter should be separated from the pipeline system.

4. If there is a drain valve, confirm that the drained liquid is connected to the recovery point and open the drain valve; when the remaining liquid in the bag filter is exhausted through the drain valve, close the drain valve. This discharge can be completed with pressurization (please refer to the pressurized discharge process).

5. Unscrew the lifting cap of the upper cover and lift the upper cover. The multi-bag filter needs to be rotated through a certain angle.

Third, replace the filter bag

    1. The high-efficiency filter bag is made of fine fibers, and the hydrophilicity of these materials is relatively weak. The surface of the fiber will not be wetted by water, so like other filter elements that use the same material, they must be wetted with some other liquid with a lower surface tension before use. Before installation, you must immerse the filter bag in a pre-wet liquid that matches the filtered liquid for a few minutes.

    2. Open the upper cover of the bag filter.

    3. Put the upper cover firmly and take out the filter bag carefully.

    4. Put in a new filter bag, please refer to the installation process.

 Fourth, monitor the quality of filtration

When the liquid input pressure is stable, the filtering quality is closely related to the pressure difference in the filter bag. If the pressure difference is too large, it means that the filter pore size of the filter bag has been blocked and the filtering speed has dropped. Therefore, we suggest that when the bag filter starts to work, the pressure difference should be checked regularly, and the time to replace the filter bag is determined by the pressure difference displayed on the front and rear pressure gauges. Generally, the filter bag can withstand a pressure of 0.5-1Kg/cm2 (0.05). -0.1Mpa). When the pressure difference reaches this range, the filter bag should be replaced in time to prevent the filter bag from rupturing and affecting the filtering effect.

If the pressure difference drops suddenly, stop filtering immediately and check for leaks.

Five, pressurized discharge of residual liquid

When filtering high-viscosity liquids, compressed air can be introduced through the exhaust valve to accelerate the discharge of residual liquid and shorten the waiting time. The device is shown in the figure. Please note: The air used for pressurized discharge must be stable, and the pressure should not exceed the working pressure of the filter.

The operation steps are as follows:

1. Close the input valve.

2. Open the intake valve.

3. The gas is introduced into the bag filter, and the remaining liquid is drained under pressure.

4. Check the outlet pressure gauge to confirm that the gauge pressure is equal to the compressed air pressure; confirm that no liquid flows out of the outlet.

5. Close the intake valve.

6. Slowly open the exhaust valve; the outlet of the exhaust valve has residual liquid sprayed out, and it must be led to a safe place or the suction port of the filter.

7. After the compressed air is exhausted, close the exhaust valve. At this time, there should be no pressure inside the filter and the cover can be opened.

Six, cleaning the bag filter

If the bag filter continues to filter the same liquid, it does not need to be cleaned. But if you filter other types of liquid, you need to clean the machine before using it.

Seven, maintenance and replacement of O type sealing ring

Maintenance: When in use, the O-shaped sealing ring should be aligned with the O-shaped groove and put into it to avoid improper squeezing and deformation of the O-shaped sealing ring; when it is not filtered, the O-shaped sealing ring must be taken out and wiped clean, otherwise the residual liquid will adhere to it after solidification. The surface hardens and the sealing performance deteriorates.

Replacement: If the O type sealing ring is aging or damaged, please replace it in time. When replacing, choose the same type of O type sealing ring.

Special statement:

1. Under normal use, the filter and support network are guaranteed for one year, if damage is caused by improper use, it is not covered by the warranty.

2. The design pressure of the standard single-bag filter is 1.0Mpa, except for special specifications with a recommended working pressure of 0.3-0.5Mpa.

3. The design pressure inside the jacket of the bag-type jacket passing device is 1.0Mpa, and the recommended working pressure is 0.3-0.5Mpa.

4. The design pressure of the multi-bag filter is 1.0Mpa, and the recommended working pressure is 0.3-0.5Mpa.