IFC P00003 — V2 Design (7 valves)

Buffer → D: No isolated path to D. V1+V2+V3+V5 also opens B/C flow path.

Sample → D: No isolated path to D. V2+V3+V5 also opens B/C flow path.

Buffer/Sample → BC simultaneous: B/C share a junction and U-path connection. Unequal flow distribution likely. Sequential B then C operation recommended.

Sample A → Pullback line

Sample B → Sample bypass

Sample C → Sample bypass

Sample AB → Pullback line

Sample BC → Sample bypass

Sample ABC → Pullback line

Sample ABCD → Pullback line