Pompa ad Ingranaggi - Serie WPP, WPL
Gear Pump - WPP, WPL Series
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In our pumps the direction of rotation is clearly shown by an arrow marking the right direc-
tion.
The pump operating temperature in normal working conditions is about 80°C. In special
pump versions, working temperatures of 180°C and more may be achieved. To protect per-
sonnel from dangers due to the temperatures reached during the operation of the machine,
in the event of accidental contact (burn), the User must reduce the external pump tempera-
ture by means of insulation plates, coatings, screens, barriers, etc. As limit reference tem-
perature for the contact surface it is advisable to take 55°C. Below this value, for hot smooth
surfaces in bare metal, there is no burn threshold. For a detailed knowledge of this problem
in relation to different particular cases, the User can read the standard UNI EN 563 Ed.’94,
where burn thresholds are specified for several types of surface according to the “surface
temperature - contact time” parameters.
Liquids to be pumped must not contain abrasive or solid suspension as this will greatly re-
duce the pump life. At this purpose we recommend the installation of a properly sized filter
on the suction line if solids may be present.
When pumps are installed in parallel, the suction lines should be adequately separated to
prevent unnecessary turbulence.
3.3
PROTECTION DEVICE
The bell housing installed by the Manufacturer is made of an aluminium die-casting, fas-
tened to the motor by screws, duly shaped to prevent fingers from coming into contact with
moving parts. It can be removed only by using a proper tool.
3.4
ADDITIONAL DESCRIPTION OF ACCESSORIES
3.4.1
Seal parts
The pump is usually supplied equipped with mechanical seal. If the Customer requires a
particular type of seal, Pompe Cucchi S.r.l. installs the desired seal after verifying if its di-
mensions are compatible with those of the pump. In case the Customer requires only the
seal mark, the Company leaves the Manufacturer to select the type of seal, by giving infor-
mation about the pumped liquid.
3.4.2
Safety valve
The pump can be equipped with a safety valve, with adjustable calibration, installed on the
front of the pump body.
After reaching the calibration pressure, prevailing on the contrast spring reaction, the valve
starts opening by connecting the outlet side and the inlet side of the pump.
The valve function is just to protect the pump from accidental pressure peaks. Its prolonged
opening may imply the pump damaging.
