I believe the term is "backwards compatible"
That would depend on the application such as high steam pressure and if throttling is needed
Downstream
the boat is going downstream.
Living Downstream was created in 2010.
Oscar Downstream was created in 2001.
Oscar Downstream's population is 130.
Oscar Downstream's population is 2,009.
downstream and upstream
You should position your feet facing downstream if you have capsized and are floating on your back in a swift river current.
assembly upstream and downstream in ammetres
Fan Powered Terminal Units. It means there is a blower in the downstream duct to help assist CFM flow from the main air handler unit ( usually in a commercial application).