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NT 1003-E00 09.12 AK O - AK I 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 adjustment and
that the components of the circuit are rated for the adjust-
ment pressure. The pressure must at no time exceed the
pressure rating of the lowest rated component.
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 nut
834
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 befo-
re 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.
PUMPS OPERATING AGAINST A CLOSED
VALVE CAN CAUSE SYSTEM FAILURE,
PERSONAL INJURY AND PROPERTY
DAMAGE.
WARNING
Hazardous pressure
can cause
personal injury
or property damage.
7. MAINTENANCE
7.1 Greasing
Except for special cases, the MOUVEX pump only requi-
res lubrication of the shaft inlet bearing.
Use a grease for good quality ball bearings.
Lubrication must be done every 1,000 hours of operation
or at least once a year.
The quantity of grease to be added must not exceed 17 cm
3
.
For pumps operating at high temperatures (in principle
from 100°C upwards) use a grease with a high drop
point.
If the pump is equipped with a Stofer oiler, and when the
type of product requires it, the pump must be greased
before each start-up, after each shutdown and every 3 to
4 hours of continuous operation.
Preference should be given to lubricants insoluble in the
product pumped and, in the case of hot products, lubri-
cants that maintain good viscosity at the operating tem-
perature.
The other elements of the pump unit (motor, reduction
gear) should be maintained in conformity with their spe-
cific technical instructions.
7.2 Checking of parts
The piston
301
and the cylinder
201
are active parts
(wearing parts). These parts must be replaced if the
thickness measurements are lower than the following
values :
- Piston (
301
) . . . . . . 9,0 mm
- Cylinder (
201
) . . . .58,6 mm
301
201
