Suppose you have 3 pipes arriving at a junction: A, B & C
There are many possible water flows:
A => B+C
B => A+C
C => A+B
A+B => C
A+C => B
B+C => A
A => B (C not flowing)
A => C (B not flowing)
B => C (A not flowing)
B => A (C not flowing)
C => A (B not flowing)
C => B (A not flowing)
Obviously, given a fixed mains pressure and static valves around this junction, only one of these options can be happening at a time.
But by changing what valves are open around the joint, I could switch between these various options.
In particular, I have a design where A, B, and C are all sometimes an in-flow and sometimes an out-flow.
Question: Do I need to get a "special" kind of 3 way joint for this?
If I just get "any old T-fitting" then will it handle any of these flow options, or are fittings "directional" in some way?
Best Answer
For pressurized water or gas, any tee will work.
For gravity drains, each direction needs a different fitting.