Relationship of discharge and minor loss coefficient

[mg-eng]

What is relationship between discharge coefficient and minor loss coefficient. Am I right with that equations?

hl – minor head loss
k – minor loss coefficient
ρ – air density
A – pipe cross section area
Cd – discharge coefficient
Δp – pressure drop
u – air velocity
m – mass flow

here is written that it is true:
https://neutrium.net/fluid_flow/discharge-coefficient-for-nozzles-and-orifices/
https://en.wikipedia.org/wiki/Discharge_coefficient

but what with case when k <= 1 ?

 

[mg-eng]

is that question too difficult?