Dover PSG Mouvex AF HT Installation, Betrieb und Wartung - Seite 12
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Before starting the pump, make sure that it rotates in the
right direction in relation to the direction in which you
want the product to flow. Make sure that the bypass is
positioned correctly in relation to the direction in which
the product flows (see § 2.4 DIRECTION OF ROTATION).
If you have to reverse the bypass to adapt it to the pro-
duct flow direction (see § 2.4 DIRECTION OF ROTATION),
drain the pump and remove all internal pressure from it
by conforming to the drainage procedures applicable to
your installation.
All operations on the bypass require that you take the
necessary precautions when handling components ope-
rating at high temperature. You must use appropriate
protective equipment.
Before adjusting the bypass, make sure that the entire
installation is designed to withstand the maximum pres-
sure generated by the pump at its maximum setting.
6.1 Operation
The normal HT bypass operates like a safety valve, by
automatically limiting the discharge pressure at the
value for which it is adjusted.
When the discharge pressure reaches the adjusted
pressure of the spring, the valve 823 opens, thus permit-
ting the partial or total return of the liquid to the inlet side
of the pump.
It should be noted that the role of the bypass, as a safe-
ty device, is limited to protecting the pump against acci-
dental over-pressure. For all electric motors (unless the
model used can handle the increased load due to maxi-
mum overpressure) it is vital to provide appropriate over-
load protection.
6.2 Orientation
The normal HT bypass only protects the pump in one
direction of operation. Consequently it is necessary to
check that the pumps direction of operation is correct by
verifying that the cap 833 is located on the inlet side. The
bypass must be reversed if in the wrong direction.
NT 1003-D00 09.12 AF HT e
6. BYPASS
CAUTION
Slippery lubricant.
Spills should be
cleaned up.
WARNING
Hazardous pressure
can cause
personal injury
or property damage.
WARNING
Hazardous or toxic
fluids can cause
serious injury.
WARNING
Hazardous pressure
can cause
personal injury
or property damage.
12/18
THE PUMP LUBRICANT IS VERY SLIPPERY
AND MAY CAUSE SERIOUS INJURY.
ANY SPILLS MUST BE CLEANED UP.
FAILURE TO RELIEVE SYSTEM PRESSURE
PRIOR TO PERFORMING PUMP SERVICE
OR MAINTENANCE CAN CAUSE PERSONAL
INJURY OR PROPERTY DAMAGE.
IF PUMPING HAZARDOUS OR TOXIC
FLUIDS, THE SYSTEM MUST BE FLUSHED
PRIOR TO PERFORMING ANY SERVICE
OPERATION.
INCORRECT SETTINGS OF THE PRESSURE
RELIEF VALVE CAN CAUSE PUMP
COMPONENT FAILURE, PERSONAL
INJURY, AND PROPERTY DAMAGE.