Yeah that makes sense that they won't make an elbow that drops two sizes, only one.
You may see some galling from the dissimilar metals but since you are doing NPT, you need pipe tape but use the yellow tape which is rated for flammable gases. The tape should prevent any galling.
There are check valves for everything. They may not be cheap but I guarantee Swagelok has one that will work, depending on your layout.
You may see some galling from the dissimilar metals but since you are doing NPT, you need pipe tape but use the yellow tape which is rated for flammable gases. The tape should prevent any galling.
There are check valves for everything. They may not be cheap but I guarantee Swagelok has one that will work, depending on your layout.