Interpump Group Pratissoli R4090 Mode D'emploi page 8

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° elbows,
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 fittings as follows:
G2 1/2 fitting – torque wrench setting 450 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.
WARNING: Use parallel threads only (not tapered threads). The
threads must comply with the working pressures and the rated
torque wrench settings with reference to their material and shape
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.
4.11- In order to optimize the pump-valve coupling, it is necessary
to keep the valve operation range, as a function of the pump
pressure and flow rate, within a maximum power of 350 kW (475
HP). As shown in the chart (pag. 4) , this means using pumps
producing a flow rate of approx. 458 l/min. for maximum working
pressures of 40 MPa (400 bar - 5800 psi), and generating a
pressure of approx. 19 MPa (190bar - 2755 psi) for maximum flow
rates of 965 l/min.
4.12- WARNING: If the valve is used at low temperature involving
the risk of icing, make sure that it is not freezed inside and/or it is
not blocked before using it.
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.
5.2- A correct maintenance helps extend the working life and grants
a better performance of the valve.
5.3- From time to time, it is necessary to check that the valve is
clean outside, and that there is no sign of leakage and/or
malfunctioning. If necessary, replace the involved parts. In case of
doubts, contact the after-sales service of Interpump Group.
5.4- Replace the valve parts with original spare parts only.
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.
5.5- The valve is entirely made of non-toxic and safe materials;
however, in case of disposal, we suggest you do not disperse it in
the environment but take it 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
responsibility as to the valve functioning and safety.
manufacturer disclaims
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
all
without notice.
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