TYPE: GFQ-1 \\ ZFQ-1<BR>main function: GFQ\\ZFQ new breath vavles are used for the safe equipments of fixed top store jar,suah as installing base oil,gasoline,kerosene,light diesel oil,fragrant hydrocarbon,whose function is avoiding damage,when vaporizing loss and protectingstore jar is over pressure or vacuum.The vavles is often used with block fire machines.<BR>Main characters: the vavles is of big ventilation,good airproof,little leakage and enduring rust etc.