English; Technical Features - Pratissoli PN2/140 Mode D'emploi

= ENGLISH =

Max FLOW RATE
MODEL
l/min.
PN2/140
PN2/250 230
PN2/500
«Translated from original instructions»
THIS DOCUMENT PROVIDES THE INSTRUCTIONS FOR
THE INSTALLATION, USE AND MAINTENANCE OF THE
VALVE, THEREFORE IT IS AN INTEGRAL PART OF THE
VALVE ITSELF AND MUST BE READ CAREFULLY BEFORE
ANY USE AND KEPT WITH CARE.
STRICTLY COMPLY
CONTAINED IN THIS DOCUMENT IN VIEW OF A SAFE AND
EFFECTIVE USE OF THE VALVE.
FAILURE TO COMPLY WITH THESE INSTRUCTIONS MIGHT
CAUSE EARLY FAULTS AND RESULT IN SITUATIONS OF
DANGER, IN ADDITION TO VOIDING ANY WARRANTY.
1- GENERAL INFORMATION
1.1- The PN2 pressure regulator is a manually-adjustable, pressure-
operated pneumatic-control device. According to its setting, this
device limits the pump/system pressure by conveying the excess of
water to the by-pass.
Moreover, when the outlet flow is blocked, it totally releases the flow,
thus keeping the pump/system at the adjusted pressure.
1.2- The pneumatic control of the valve allows to change the hydraulic
working pressure by changing the air pressure. The two pressures are
proportional, i.e. when increasing the pneumatic pressure the
hydraulic pressure increases and when reducing the pneumatic
pressure the hydraulic pressure decreases (see table A).
1.3- The pneumatic control of the valve allows to cut in or to cut out
the adjusted hydraulic pressure. This function is particularly suited for
automatic working cycles and remote controls. When the hydraulic
pressure is cut out, the pump starts at zero pressure, i.e. without the
motor being under stress.
1.4- In order to operate the pneumatic control of the valve it is
necessary to use compressed air with a value depending on the
desired hydraulic pressure. In order to correctly operate the pneumatic
control we suggest you use a 3/2-way valve and a pressure regulator
as shown in the diagram (table B).
1.5- Since the PN2 valve is used in connection with a high pressure
water pump/system, which shall be called hereafter only "system",
installation and use must be suited to the type of system used and
comply with the safety Regulations in force in the Country where the
valve is used.
1.6- Before using the valve, make sure that the system the valve is
used with is certified to comply with the relevant Directives and/or
Regulations.
1.7- Before installing and using the valve for the first time, we suggest
you check that it is undamaged and make sure that the rated features
correspond to the required ones. If this is not the case, do not use the
valve and contact the after-sales service of Interpump Group for
information.
1.8- In order to install the valve correctly, follow the instructions for the
water inlet, outlet and by-pass connections, as stated in this
instruction manual and/or on the valve itself.

TECHNICAL FEATURES

Max PRESSURE
g.p.m.
MPa
(USA)
14
61 25
50
WITH THE INSTRUCTIONS
Max TEMPERATURE
bar p.s.i.
140 2030
250 3626
500 7250
2- PACKAGE AND HANDLING
2.1- Packages must be handled in compliance with the instructions
stated on the packages themselves and/or provided by the
manufacturer.
2.2- In case the valve is not used immediately, it must be stored in its
integral package and placed in areas which are not exposed to the
weather and which are protected from excessive humidity and from
direct sunlight. Moreover, it is advisable to place wooden pallets or
other types of pallets between the package and the floor, in order to
prevent the direct contact with the ground.
2.3- The package components must be disposed of in compliance
with the relevant laws in force.
2.4- Take great care when lifting and handling the valve during
installation and avoid any sudden accelerations or changes of
direction. Also avoid any excessive oscillations and keep the valve
upright in order to prevent any loss of stability and the possibility of
overturns.
2.5- To lift the valve, use tools such as snap-hooks, straps, ropes,
hooks etc., which must be certified and suited for the mass to be
lifted. The valve mass is stated in the table of technical features.
3- INSTRUCTIONS FOR PRESSURE SETTING
3.1- In order to obtain a correct adjustment and consequently a
proper functioning of the valve, always make sure that, when
working at the maximum pressure, the valve by-pass keeps
releasing a quantity of water equal to 5% of the total flow-rate. In
case the flow-rate at the by-pass is close to zero or exceeds 15% of
the maximum flow-rate, this could cause faults, early wear and result
in situations of danger.
The positions mentioned in the following instructions refer to those
shown in the spare parts catalogue (page 4).
3.2- Connect the valve to the water system and to the pneumatic
circuit, then follow these steps:
3.2.1- Open the pneumatic pressure regulator completely in order to
control the valve.
3.2.2- Start the hydraulic system on which the valve is fitted and
make sure that the air contained in it is fully ejected.
3.2.3- Open the gun or the water control device. Start the pneumatic
circuit and begin adjusting the air pressure within the valve by using
the pneumatic pressure regulator. Alternate the adjusting operations
with a few openings and closings of the gun or of the control device.
When the desired hydraulic pressure has been reached, open and
close the gun/control device a few times again in order to stabilize the
various components (seals, springs etc.). Check the pressure value
again and correct if necessary.
3.2.4- In case you decide to change the adjusted hydraulic pressure
later, follow the procedure stated in paragraph 3.2.3 again.
3.2.5- The cylinder pos. 34 is equipped with a safety valve pos. 1.
The function of the safety valve is to limit the pneumatic pressure
within the PN2 valve. The installer must adjust the safety valve so
that it opens when the pneumatic pressure is approx. 10% higher
than the pneumatic pressure necessary to obtain the maximum
desired hydraulic pressure.
- -
7
°C °F
60 140
MASS
kg lbs
16 35.2