(12) Three manual shut-off valves are located in the system
One is at the inlet to the first stage.
The second is
between the first and second stages.
The third is between the second
and third stage.
This permits isolation of each stage.
(13) A bypass valve is located on the inlet to the first
This permits the filter elements to be bypassed during pumping
for other than oil-water separation.
(14) A flow rate gauge is installed in the water outlet