PPH活套法兰
   套法兰是利用翻边、钢环等把法兰套在管端上，法兰可以在管端上活动。钢环或翻边就是密封面，法兰的作用则是把它们压紧。由此可见由于被钢环或翻边挡住，活套法兰不与介质接触。因为法兰是可以活动的，不直接和管道连接，所以称之为活套法兰，也有另一种说法叫松套法兰。
   The flange of the sleeve is the use of flanging, steel ring flange is set at the end of the pipe, flanges can be at the end of the tubular activities. Steel ring or flanging is sealing surface, flange is pressed them. Thus due to the steel ring or flanging block, looper flange contact with the media. Because the flange is movable, not directly and pipeline connection, so called looper flange, there is also another version called loose flange.