graphviz with combined edges

Question

I'm looking for a way to achieve something like this in graphviz:

          --- node B 
          |
node A ---
          |
          --- node C

another example (at the bottom): http://machining.grundfos.de/media/60727/grundfos_pumpenhandbuch.pdf#23

Is there a way of doing that with graphviz?

so far I only got orthogonal edges:

digraph G {
 graph [rankdir=LR,splines=ortho,concentrate=true];
 node [shape=box,];
 edge [dir=none];

 a -> b;
 a -> c;
}

Answer 1

you must introduce intermediate (eventually hidden) nodes to act as split points. For instance:

digraph G {
 graph [rankdir=LR,splines=ortho,concentrate=true];
 node [shape=box,];
 edge [dir=none];
 i [shape=point];
 a -> i -> b;
 a -> i -> c;
}

yields