国内无码人妻九九_午夜精品国产理论片_国产裸乳18禁www网站_亚洲日韩成人AV无码网站_不小心滑进去中文字幕_欧美专区第七十一页_丰满熟妇大肉唇张开视频_男生与女生在一起怼怒怼 优质答主 ta获得超过150个赞_中文字幕亂碼亞洲中文在線_男女啪啪免费网站

The service time of a filter element depends on the following points. If there is any excess, the filter element must be replaced;

1) The filter element fails to pass the integrity test;

2) The pressure difference is more than 2 bar;

3) The flow rate can not meet the requirements of production;

4) The proven service life has been reached.