GENERAL PUMP
A member of the Interpump Group
RA2
Industrial Unloader
INSTRUCTIONS FOR USE (CONT.)
Ref 300929 Rev. B
05-20
4.5 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 lower. Therefore,
take care in case of contact with the hot surface.
4.6 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 downward in order to avoid damage
or injury.
4.7 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.
4.8 To connect the valve to the system it is referable to use
flexible hoses fitted in a way that they do not for 90
0
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.
4.9 Tighten the fittings as follows:
G1” inlet fitting - torque wrench setting 147.5 Ft.lbs.(200 Nm)
G3/4” outlet fitting - torque wrench setting 88.5 Ft.lbs.(120 Nm)
G1-1/4” bypass fitting - torque wrench setting 221.3 Ft.lbs.(300 Nm)
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.
4.10 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.
4.11 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.
4.12 In order to optimize the pump/valve coupling, it is nec-
essary to keep the valve operation, as a function of the pump
pressure and flow rate, within a maximum power of 81.5 HP. As
shown in the chart, this means using pumps producing a flow
rate of approx. 39.6 GPM for maximum working pressures of
3045 PSI , and generating a pressure of approx. 1958 PSI for
maximum flow rates of 60.7 GPM.
WARNING: Do not use the valve in the systems covered by
Directive 97/23/CE (PED) - Cath
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.
453 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 GP’s Customer Service Department.
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.
4.5 The valve is entirely made of non-toxic and safe materials;
however, in case of disposal, we suggest you do not dispose of
it in the environment but take it to an authorized disposal center
or contact the Customer Service Department.
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.