Where are Valves used?

Authoritative article  in Valve Magazine about the Pipeline Valve industry as well as brief definition of the difference between Upstream, Midstream and Downstream:

This nation is crisscrossed by hundreds of thousands of miles of crucial pipelines that transport vital feedstock from sources to the places where it’s transformed into fuel and products. For the valve industry, that translates into millions of dollars of business – See more at:http://www.valvemagazine.com/index.php/magazine/sections/where-valves-are-used/4405-where-valves-are-used-pipeline-valvesalways-ready#sthash.ro1VEBAb.dpuf