Celebrating Apollo Site Index
APS Engine Gallery


Inside the valve package assembly, the fuel and oxidizer passages each divide into dual flow paths, with valves in each flow path. The paths rejoin at the valve package outlet. Here we see the oxidizer path (the larger-diameter line below the silver tubing); oxidizer enters at left, splits into two flow paths, passes through the valves, and rejoins at right.

I had read about redundant valves and propellant paths, but I couldn't visualize it until I inspected this particular VPA.

APS Engine oxidizer dual flow paths through valve package assembly at Celebrating Apollo
Time picture taken Fri Nov 17 14:19:32 2017
Location picture taken Gilbert H. Hansen Photography Gallery
EAA AirVenture Museum
Oshkosh, Wisconsin
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