If the drawings of the valves in their positions is correct, they are stating the 'L' is a 2 position 3 way.
I use a 3 position 3 way. Blocked center, then select port to go to A or B outlets/inlets (what you application is). I use one pump to do the work of two by using two of these valves. Select my inlet source (MLT or HLT) then select the output source (MLT/BK/HLT) with 3rd 2pos/2way valve.
Picture? Do you have a manifold set up? I have a direct-fire MLT and am set up horizontal and have 2 pumps. I am thinking HLT & MLT into one pump that can serve MLT or BK. BK into 2nd pump that can serve BK (for recirc) or HopRocket->Therminator->Fermenter.
Looking at 4 L-type valves