Installing buttweld schedule 80 valve into buttweld schedule 40 pipe?
Installing buttweld schedule 80 valve into buttweld schedule 40 pipe?
(OP)
Does anyone know if it is possible to install a 4" buttweld schedule 80 valve into a buttweld schedule 40 pipe? Both are WC9. Thanks!





RE: Installing buttweld schedule 80 valve into buttweld schedule 40 pipe?
RE: Installing buttweld schedule 80 valve into buttweld schedule 40 pipe?
RE: Installing buttweld schedule 80 valve into buttweld schedule 40 pipe?
RE: Installing buttweld schedule 80 valve into buttweld schedule 40 pipe?
. . . not to butt in, but he means that Sch80 will have a smaller ID than Sch40 due to its thicker wall, therefore if you simply weld the 2 ends together, there will be step-down on the ID. This is dealt with by boring a taper (bevel) on the ID of the Sch80 piece (in your case the valve) so that there is a smooth transition between IDs. B16.25 might have a recommended taper angle (or length) for connecting dissimilar IDs.
If I remember correctly, I've generally seen this in the reverse of your case, i.e., a Sch40 valve going into Sch80 piping, so the pipe gets the bevel.