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NT 1003-A00 09 18 AZ O e
6. BYPASS (continued)
6.5 Obtaining the flow
Before carrying out any adjustments, make sure that
there is a means of reading the pressure during adjust-
ment and that the components of the circuit are rated for
the adjustment pressure. The pressure must at no time
exceed the pressure rating of the lowest rated compo-
nent.
If the flow is lower than anticipated, the cause may be
due to incorrect adjustment of the bypass valve.
To correct the flow, gradually tighten the adjustment
screw
806
after making sure that the pump is running
well at the recommended speed.
If during adjustment, you compress the spring to its limit
or disturb the operation of the motor, without obtaining
the flow required, this means that the pump unit must
operate with a pressure higher than that for which it was
designed. In this case you should consult our Technical
Services.
When you obtain the required flow, make sure that the
motor can withstand the increased power due to the
overpressure created by closing off the discharge line.
6.6 Energy consumption
If the energy consumption does not correspond with
expectations, the reason may be poor adjustment of the
bypass valve.
If consumption is low and you do not get the required
flow, close the discharge valve and tighten the adjust-
ment nut until the correct power consumption level is
reached. Then open the discharge valve as it was before
adjustment.
If consumption is high, close the discharge piping and
slacken the adjustment nut until the correct power
consumption level is reached. Then open the discharge
valve as it was before adjustment.
6.7 Bypass use
Standard bypass should not be operated too frequently
(even less permanently) since it would result in useless
power consumption and material fatigue detrimental to
equipment life.
WARNING
PUMPS OPERATING AGAINST A CLO-
SED VALVE CAN CAUSE SYSTEM
FAILURE, PERSONAL INJURY AND
PROPERTY DAMAGE.
Hazardous pressure
can cause
personal injury
or property damage.
