{HEAD ~ A three way valve} operates to direct {TAIL ~ the flow} of the concentrates into or bypassing a container located at a filling station in which the chemical composition is formed 
operates to direct
{ HEAD ~ A three way valve } operates to direct { TAIL ~ the flow } of the concentrates into or bypassing a container located at a filling station in which the chemical composition is formed
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH