... flanges, Spectacle flanges,TG flanges,Socket welding flanges and Threaded flanges,Square flanges.6. Pressure ratings :class ... :150 300 400 600 900 1500 and 2500, PN :6 10 16 25 ... ,RF, LJ, FM ,RTJ,RJ ,MALE ,FEMALE and so on .8. Used for : petroleum,chemical,power,gas ... of China.19. Our objective:Survival by quality and development by credibility,quality first,customer upmost !20. ...