# Pipe-network pressure - mass flow relation

I have a question regarding a pipe-network:

Pressure A > B
diameters of the outside pipes are bigger than the pipe with the massflow m2,m3


The brown rectangle is a valve (the diameter of the valve is smaller than the pipe-diameter). I know from the continuity equation, that the volume flow rate in a pipe is constant. But how is that relation within a network? Is:

massflow: m2 < m3(through the valve)?
massflow m1 < m2 (smaller diameter)?


m2=m3

m1>m2