Pratissoli PN3 Mode D'emploi page 8

that it opens when the pneumatic pressure is approx. 10% higher
than the pneumatic pressure necessary to obtain the maximum
desired hydraulic pressure.
3.2.6- The maximum pneumatic pressure allowed within the PN3
valve must not exceed 0.7 MPa (7.0 bar).
In case of doubts, do not hesitate to contact the
after-sales service of Interpump Group.
IMPORTANT:
maximum values of pressure (of water and air),
flow-rate and
document and/or indicated on the valve.
4- WARNINGS
4.1- The installation and the setting of the maximum pressure must be
made by qualified staff only, who must have the required skills to
handle high pressure systems and be informed of the operating and
safety instructions contained in this document.
4.2- The installer must provide the ultimate consumer with the proper
instructions for the correct use of the system the valve is used in
connection with.
4.3- Use soft and filtered water only. In case of salt water and/or of
water containing solid particles of a size exceeding 360µm, the
internal components of the valve will be subject to quick wear;
furthermore, this might compromise the correct functioning of the
valve. Addition agents can be used in the water, provided that they
are delicate, biodegradable and always complying with the
Regulations in force in the Country where the valve is used.
4.4- In the systems for hot water production, the
temperature of the liquid that comes into contact with the
valve must always be lower than the value stated in this
instruction manual and/or indicated on the valve itself.
Avoid the formation of steam or overheated water.
IMPORTANT: When the temperature of the liquid is
close to the maximum value, the outside temperature of
the valve body is only slightly inferior. Therefore, take
care in case of contact with the hot surfaces.
4.5- After use and/or before performing any operation on the system
or on the valve, release the pressure by using the adjustment
knob/screw and opening the gun or the control device for a few
seconds. The jet created by the residual pressure must be directed
downwards in order to avoid damages or dangers.
4.6- For safety reasons, it is advisable to equip the high pressure
feeding line of the system also with a relief or safety valve duly
adjusted.
4.7- To connect the valve to the system it is preferable to use flexible
hoses fitted in a way that they do not form 90° elb ows, throttlings or
siphons which could include harmful air bubbles. The inside diameters
of the hoses and fittings must be equal to the correspondent inside
diameters of the inlet, by-pass and outlet threads of the valve.
Moreover, it is necessary to correctly choose the type of hose
depending on the rated pressure and flow-rate; the hoses must
always be used within their operation limits as stated by the
manufacturer and indicated on the hoses themselves.
4.8- Tighten the G1"1/2 inlet, outlet and by-pass fittings of the valve
(torque wrench setting 350 Nm ±5%).
In order to ensure the seal, fit a metal washer with a rubber ring
between the fittings, or use a proper sealant on the thread.
4.9- Always connect the valve by-pass fitting to a hose, in order to
avoid the excessive noise caused by the water outflow through the
by-pass without hose.
4.10- Before operating the system, it is advisable to start it for a
preliminary test run in order to check that the system is properly
installed.
5- MAINTENANCE
5.1- Maintenance and repair must be carried out by qualified and
authorized staff only. Before any operation, make sure that the valve
and the system are shut down and made unusable.
During use, never exceed
temperature as stated
5.2- A correct maintenance helps extend the working life and grants a
better performance of the valve.
5.3- From time to time, check the oil window pos. 4 to verify the oil
level. If necessary, add the oil by the cap pos. 1 up to the middle of
the oil window.
5.4- From time to time, it is necessary to check that the valve is clean
outside, and that there is no sign of oil or water leakage and/or
malfunctioning. If necessary, replace the involved parts. In case of
the
doubts, contact the after-sales service of Interpump Group.
in this
5.5- Replace the valve parts with original spare parts only. Use
only oil types as stated below.
IMPORTANT: After maintenance, make sure that the valve
is re-assembled correctly and that the initial conditions are
restored. Comply with the torque wrench setting values
and set the pressure again as described above.
5.6- The valve contains approx. 0.6 litres of high-viscosity hydraulic oil
(cSt 40° C=44.2) containing addition agents used to grant higher
performances, with an excellent level of protection against wear and
high oxidation and corrosion strength. It is possible to use other oils
having similar features provided that they are VG 46 DIN 51519 ISO
quality (or with 15W-20 SAE degree).
5.7- The exhausted oil must be gathered in containers and
disposed of contacting the authorized centres as established by
the laws in force. The oil must not be dispersed in the
environment for any reason.
5.8- In case of disposal, we suggest you take the valve to an
authorized disposal centre or contact the nearest INTERPUMP
GROUP Authorized Service Centre.
IMPORTANT: The valve shall not be tampered with for
any reason and/or used for any purpose other than the
use it has been designed for. In case of tampering, the
manufacturer disclaims all responsibility as to the
valve functioning and safety.
6- WARRANTY CONDITIONS
6.1- The period and conditions of warranty are specified in the
purchase contract.
6.2- Warranty is voided in case the valve is used for improper
purposes, used at higher performances than the rated ones, repaired
with non-original spare parts or if it turns out to be damaged due to
the non-compliance with the operating instructions or to unauthorized
tampering.
Copyright
The content of these operating instructions is property of Interpump
Group.
The instructions contain technical descriptions and illustrations that
cannot be copied and/or reproduced, entirely or in part, nor distributed to
third parties in any form and without in any case authorized written
consent of the owner.
Offenders will be prosecuted according to the laws in force and proper
legal actions will be instituted against them.
The information contained in this document may be modified without notice.
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