Pipes & Fittings: Van Leeuwen, FBF etc... or via a pipe constructor
Pipe constructor with engineering capabilities: J. De Jonge, Fabricom, Bocard...
Valves: Prometal, Transmark, Econosto, Sodeco...
AND of coarse, a pipe system is bound to a process installation with EE&I... the best creative partner to manage and automate your project is Egemin (www.egemin.be)