33
HYDRAULIC CONNECTION
For the hydraulic suction, delivery and bypass connections, refer to the following table and to Fig. 4, which
represents a generic diagram of a possible machine integrating the pump.
A Pump
b Pressure unloader /regulation valve
C Suction circuit
D Delivery circuit
E Spray gun (example of accessory)
F motor
G Lance
H Nozzle head
CAUTION
• Follow the connection instructions already indicated in the
“C
HECKING
AND
CONNECTING
UP
TO
THE
WATER
SUPPLY
”
and
“S
PECIFICATIONS
AND
TECHNICAL
DATA
”
paragraphs.
In particular, the suction circuit must be sized so as not to determine on the pump suction fitting:
- a pressure higher than 8 bar/116 psi;
- a vacuum higher than: 0,15 bar/2,18 psi (series AX, BX and pumps at 1000, 1450 and 1750 RPM);
0,1 bar/1,45 psi (MTP LWR-K, MTP ZWR-K); 0,1 bar/1,45 psi (pumps at 2800 and 3400 RPM).
• At pump suction, a filter of adequate dimensions must be fitted. In case of doubts, contact the Manufacturer.
• The suction pipes must have a suitable internal diameter and a nominal pressure of 10 bar/145 psi.
• The delivery pipes must have a nominal pressure not below the pump max. pressure.
On the models LW, ZW, FW, RW, HW, AW, BW, SW and TW, suction and delivery fittings are available both
on the right side and on the left side of the head.
PRESSURE UNLOADER/REGULATION vALvE
In the models in which it is already built-in (pumps marked with the letter K preceded by a dash and pumps
of the AX and BX series), this is factory set so maximum pump pressure is achieved, using a nozzle which also
allows having a small flow rate in bypass (at least 0.3-0.6 l/min/0.08-0.16 USgpm).
The Manufacturer’s Technical Assistance Service is at the disposal of the
Skilled Technician
to provide all the
information needed, taking into account the fact that such adjustment may have to be corrected according to
the plant engineering configuration in which the pump is installed.
RESETTING THE PRESSURE UNLOADER/REGULATION vALvE
WARNING
• Operating pressure must never exceed the maximum value indicated for the pump (see also the
“
s
peciFications
and
technical
data
”
paragraph).
To reset the valve, proceed as follows (refer to Fig. 5):
- remove the plastic knob by pulling it upwards;
- loosen the Allen screw (m);
- turn the retention ring nut (l) anticlockwise, so as to partially unscrew it;
- set the required pressure by means of the hexagonal knob (n) (turn clockwise to increase the pressure,
anticlockwise to reduce the pressure);
- turn the retention ring nut (l) clockwise, to tighten it;
- fully tighten the Allen screw (m).
EN
Содержание Comet AX Series
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