General Pump KEZ Owner Manual v.2 - Manual (Page 9)

GENERAL PUMP
A member of the Interpump Group
KEZ SERIES
Page 9
9.4 Hydraulic Connections
In order to isolate the system from the vibrations produced
by the pump, we advise to build the first section of the duct
near the pump (both for intake and delivery) with flexible
hose. The consistency of the intake section must allow to
avoid deformation caused by the depressurization pro-
duced by the pump.
9.5 Pump Feeding
To obtain the best volumetric efficiency, a minimum posi-
tive head of 0.20 meters (7.87 inches) is required. In case
of fluid temperatures ranging from 95 0 to 185 0 F (35 0 to
85 0 C) the correct inlet pressures are specified in the
graph below.
For negative head values, please contact the
Customer Service Department.
9.6 Suction Line
For the pump’s correct operation, the suction line must
have the following characteristics:
1. Minimum internal diameter as indicated in the diagram
in paragraph 9.9, and in any case equal or greater than
the pump head’s value.
Along the duct, avoid localized diameter reductions
that may cause pressure drops with subsequent
cavitation. Absolutely avoid 90 0 elbows, connections with
other hoses, bottlenecks, counter-slopes, upside down “U”
shaped curves, “T” connections.
2. The selected lay-out must allow to avoid cavitation.
3. It should be perfectly airtight, and built in a way that
guarantees perfect sealing over time.
4. Avoid pump emptying when stopping (even partial
emptying).
5. Do not use hydraulic-type fittings,3 or 4 way fittings,
adapters, etc. , since they may hinder the pump’s per
formance.
6. Do not install Venturi turbes or injectors for detergent
intake.
7. Avoid the use of standing valves, check valves, or any
other type of one-way valves.
8. Do not connect the by-pass line from the valve directly
to the pump suction line.
9. Provide appropriate baffle plates inside the tank in
order to avoid water that fows coming from both the by-
pass and feeding lines may create turbulance newr the
tanks outlet port.
10. Make sure that the suction line is perfectly clean inside
before connecting it to the pump.
The filter must be installed a close as possible to the
pump, should allow easy inspection and have the follow-
ing characteristics:
1. Minimum capacity 3 times greater than the pump’s
rated flow value.
2. Filter port diameters must not be smaller than the
pump inlet ports.
3. Filtration degree ranging between 200 and 360 µm.
9.7 Filtering
On the suction line, install 1 filter arranged as shown in fig.
6 and fig. 6/a.
With the manual adjustment valve:
With the pneumatic adjustment valve:
In order to guarantee correct pump operation,
it is important to plan periodical cleaning of
the filter depending on actual pump usage,
water quality and real clogging conditions.
Ref 300665 Rev.C
07-13