Service manual

11
DANGER
The Imo pump is a positive displacement type. It will deliver (or attempt to deliver)
flow regardless of back-pressure on unit. Failure to provide pump overpressure
protection can cause pump or driver malfunction and/or rupture of pump and/or piping.
Relief Valve
Figure 7– Proper Relief Valve Return Line Arrangement
Some low pressure pump models include built-in safety relief valves. They are intended
only for emergency operation, NOT for system control. Extended operation of relief
valves in these pumps could lead to pump damage or failure.