... 1. IntroductionUsed the movable junk ring and self-locking angled wedge type of structure, the workers can fast lock the ... metal voluble graphite, ring nuts, loose joints and bolts.Acid filter for metallurgy industryDouplex filter-HBL SeriesStainless steel line strainer ... such as air filter, water filter, oil filter, carbon filter, acid filter, oil purifier, filter bag, bag filter, filter cartridge , ...