IMO ACF5 - Setting the Pressure Relief Valve; Adjusting the Tuning; Setting of Tuning of the ACF

ACF5 0601.01 GB
www.imo.se
21
Starting
Check that all valves necessary for the operation are
fully opened in both discharge and suction lines.
The rst time, the pump should be started with the ad-
justing spindle of the pressure relief valve tightened to
half of the available turns (the valve seing is increased
when the spindle is turned clockwise). By monitor-
ing the pressure gauge it can be determined when the
suction line is primed and the pump begins to work.
Should the pump not operate normally soon aer start,
stop the pump within half a minute. Start again aer
about 3-5 minutes (the sha seal must have time to cool
o) and run for half a minute. This procedure may need
to be repeated a couple of times if the suction line is
extremely long. Should the pump still not work, it must
be assumed there is a problem in the system that needs
to be remedied. Check the suction line calculation or
see”Trouble shooting”, page 22.
Setting the pressure relief valve
The seing of the opening pressure is made as follows:
Tighten the valve spindle by rotating clockwise to the
maximum extent. The system pressure is regulated by
throling to required value. The pressure relief valve
is eased until the pressure is just beginning to decrease
by turning the spindle CCW. The valve is now preset
for desired opening pressure. Open the throling valve
entirely.
Adjusting the tuning
The tuning adjustment, which is a standard feature on
ACF pumps, is a device for minimizing the eects of
dissolved and free air in lube oil systems. The tuning
principle is described in the Product Description. The
tuning should be adjusted while the pump is working
under normal operating conditions. This is done by
turning the tuning spindle with an Allen key (size 12
mm for ACF) to a position where the noise level comes
to a minimum.
Setting of tuning of the ACF:
1. Before starting the seing, check that the seing
screw are closed.
2. Turn the screw CCW until the noise level becomes
the lowest (if turned too much the noise will increase
again).
Once set, the tuning needs no further adjustment, pro-
viding the operating conditions stay the same.
NOTE: It´ s not possible to accidentally turn the tuning
spindle too far as it is internally locked at the end of the
thread.
23
m
If operating temperature exceeds 60°C
(149°F), appropriate measures to avoid
skin contact shall be provided
24
m
Use hearing protection whenever high
noise can be expected from pump, motor
and/or environment.
Fig. 10 Tuning the ACF