PE垫环
  垫环：它与插板配合使用，用在插板的位置，其圆环形装，锻制机加工而成，厚度同插板，其作用就是给保证管道安装长度不受检修及压力试验影响。便于安装插板方便，安装在检修点或试验点上，现在为了安装更为方便，把垫环和插板通过支撑板焊接在一起，名叫8字盲板。
  The pad ring: it and the plate with the use of, in inserting plate position, the ring shaped, forging machine processing, thickness of the inserting board, whose role is to ensure pipeline installation length without maintenance and pressure tests. Convenient installation board convenient, arranged in an inspection or test point, now in order to install more convenient, the pad ring and inserted plate through the supporting plate are welded together, named the 8 word blind plate.