How to Read an Injector Chart
charts can be confusing because of the multiple columns and
This is a quick lesson on how to interpret injector charts to
determine which model will work for your ozone application.
of an injector:
Water flows from left to right; ozone is introduced into the
is a chart for a very popular ozone injector.
The injector is capable of injecting both liquids and gases.
For ozone, we can completely ignore the 3rd and 4th
columns because they apply to liquid suction only.
first column is the injector inlet pressure, which is the pressure provided from
The 2nd column is the injector outlet pressure, which is the
pressure exerted on the injector outlet from delivering the water where it needs
The next column called MOTIVE FLOW states the flowrate of water going
through the injector.
The last column called AIR SUCTION lists the amount of air, or ozone,
that can be sucked into the water stream.
As can be seen from the chart, as injector outlet pressure (2) increases,
injector suction decreases (6).
This is true even though the motive flow (5) stays relatively constant.
delivering 18 GPM @ 15 PSI can inject a maximum of 20 SCFH (10 lpm) of
air if 7 PSI of back pressure exists.
suction is needed, two options exist:
Increase the size of the pump, or decrease injector outlet
pressure by increasing the diameter of the pipe, reducing the number of
elbows or lowering the height the delivered water.
= pounds per square inch gauge
The terms “venturi” and “injector” are used synonymously
in the ozone industry”
= gallons per minute
scfh = standard cubic feet per hour
for our venturi product line.