13/19
NT 1003-E00 09.12 AK O - AK I e
6. BYPASS (continued)
6.3 Inversion
Before commencing work, make sure that the pump
cannot be started up, even accidentally. Before opening
the pump, it must be drained and relieved of any pressu-
re it may contain. Take care to check that the isolation
valves, if any, are closed before pulling out the drain
plug
434
and its seal
412
.
To reverse the bypass, unscrew the nuts on the studs
813
and turn the bypass through 180°.
Before locking the bypass in its new position, check the
condition of the seals
877
and their installation.
Tighten the nuts on the studs, taking care to balance the
tightening so that the bypass remains vertical.
6.4 Adjustment
To adjust the bypass, unscrew the cap
833
and its seal
832
, turn the adjustment nut
834
clockwise to increase
the discharge pressure, and anticlockwise to decrease
it. Once the adjustment is finished, do not forget to re-
screw the cap
833
and its seal
832.
Adjustment of the bypass is satisfactory when the flow
meets the pumps requirements and when the motor
bears the power increase due to the overpressure seen
upon closing the discharge. This is how the bypasses of
our pump units are adjusted, as a function of the infor-
mation provided by our Technical Services.
The pumps supplied bare shaft are delivered with a stan-
dard bypass setting which needs to be adjusted with the
exact working conditions and installation, as per the
above described procedure.
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.
BE CAREFUL WITH THE WEIGHT OF
THE PARTS WHEN THEY ARE BEING
REMOVED.
WARNING
The weight ot the parts can
be dangerous and may
provoke bodily injuries or
material damages.
DISCONNECT THE ELECTRICITY SUPPLY
BEFORE ANY MAINTENANCE OPERATION.
WARNING
Dangerous voltage.
Can cause
injury and death
.
IF PUMPING HAZARDOUS OR TOXIC
FLUIDS, THE SYSTEM MUST BE FLUSHED
PRIOR TO PERFORMING ANY SERVICE
OPERATION.
WARNING
Hazardous or toxic
fluids can cause
serious injury.
FAILURE TO RELIEVE SYSTEM PRESSURE
PRIOR TO PERFORMING PUMP SERVICE
OR MAINTENANCE CAN CAUSE PERSONAL
INJURY OR PROPERTY DAMAGE.
WARNING
Hazardous pressure
can cause
personal injury
or property damage.
Spring
Loading (bar)
Mini
Maxi
N°3
1,3
3,6
N°5
*
2,4
6,5
* Only available construction O.
