DL series bag filter is a kind of multi-purpose filter equipment with new structure, small volume, simple operation, energy saving, high efficency, closed working and strong adaptability. It is widely used at the chemical, coating, printing ink and food industries. This model machine includes the single filter and the duplex filter, forming completed set with the conveying pump unit assembled on the movable trolley respecively. The filter bag protection screen of filter is made of two sorts, carbon steel and stainless steel, optional depending on different filter mediates users.