cast steel check valve:api6d/bs1868 standard

 cast steel check valve:iso 14313

  face to face:asme 16.10

  end flange:asme b16.5

   butt welding end:asme b16.25

   inspect and test:: api598/api6k

   bolted bonnet

   swing type,anti-rotation disc

   non-penetrate disc shaft

   horizontal or vertical service

   flanged or butt welding ends