... )DN20DN25DN50DN80DN100DN150DN200DN250DN300ConnectionFlangeMaterialCast steelExecutive StandardQ/20735525-5.3-2010 <gas filter>Character1 High filtering accuracy, large filter ... all kinds of gas equipment s gas purificationMediamanufactured coal gas, LPG, air, gas, town gas, natural gas and other non- ... was established in 1952, we have rich experience in Gas equipment, and we enjoy great fame in ...