Piusi MA Série Mode D'emploi page 53

M CONNECTING THE PRODUCT CIRCUIT
After positioning the pump you can now connect it to the product circuit as follows:
WARNING
1. On the delivery and discharge manifold install a manual valve of the same diam-
eter as the pump inlet (never smaller) to intercept the fluid correctly in case of spills
and/or when servicing the pump.
2. Install the sleeves to secure the flexible hoses on both valves.
3. In the event of a vertical delivery higher than 5 meters, we advise to use a check
valve to prevent the fluid from returning into the pump.
WARNING
only fittings with cylindrical gas threads in materials
compatible with both the fluid to be pumped and
the pump's construction materials must be used.
For example:
Pump made from PP = PP fitting
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the pump must be connected with FLEXIBLE HOSES
REINFORCED WITH A RIGID SPIRAL of a diameter
never smaller than the pump's connection. The
filters or other equipment installed at the intake
side must be suitably dimensioned in order to avoid
pressure drops. For negative installations and/or
viscous fluids, use hoses with an OVERSIZE DIAME-
TER, especially on the intake side.
Do not attach the pump DIRECTLY with rigid metal
pipes (on plastic pumps) and/or pipes with tapered
thread, as they can cause severe stress and/or vi-
brations and breakage of the manifolds and other
parts of the pump.
Always use flexible joints with fittings made of
the same material of the pump (PP with PP, ALU
with ALU)
Do not use threadlockers and/or Teflon paste. The
installer must ensure that the fittings are centred
during assembly to prevent cracks and/or to prevent
the threads from yielding.
Also check that any excess PTFE tape and excessive
clamping pressure does not place stress on the
manifold or other parts of the pump.
Pay particular attention to stress corrosion crack-
ing. The pump material may deteriorate due to the
combined action of corrosion and application of a
load, which may cause parts subjected to stress to
break suddenly and unexpectedly, especially at low
temperatures.
Check if the connection tubes to the pump are clean
inside and do no contain any working residue.
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EN