ACF5 0601.01 GB
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Gauges
Gauges for monitoring the pump’s working conditions
are recommended. These gauges should be placed
readable as close to the pumps in- and outlet anges as
possible. The ACF pump is equipped with convenient
connections for measuring the inlet and the outlet pres-
sure by means of pressure gauges.
Pressure relief valve
All systems with screw pumps must be equipped with
a pressure relief valve installed immediately adjacent
to the pump. In the standard versions of IMO AB low
pressure pumps, this pressure relief valve is an integral
part of the pump to protect the system against excess
pressure. When liquid is circulated through the valve
it heats up in proportion to the set pressure level and
the percentage of by-passed liquid. 100% by-pass can
only be tolerated for less than about 3 minutes, 50%
by-pass generally for unlimited periods of time. If more
than 50% recirculation is anticipated, a value specic
to each application should be determined by closely
monitoring the pump body temperature. If the pump is
operating in line with a separate pressure control valve,
the seing of the relief valve should be high enough so
as not to interfere with the control valve. Likewise, if
two pumps are operating in parallel, the seing should
be such that interference between the two valves is
avoided.
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