English; Technical Features - Interpump Group Pratissoli PN2 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 WITH THE INSTRUCTIONS 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).
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 3).
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.

TECHNICAL FEATURES

Max PRESSURE
g.p.m.
MPa bar
(USA)
14 140
61 25 250
50 500
Max TEMPERATURE
p.s.i. °C
2030
3626 60
7250
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.
3.2.6- The maximum pneumatic pressure allowed within the PN2
valve must not exceed the below-mentioned values:
PN2/140 = max. air pressure 0.70 MPa (7.0 bar)
PN2/250 = max. air pressure 0.63 MPa (6.3 bar)
PN2/500 = max. air pressure 0.75 MPa (7.5 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 temperature as stated in this document
and/or indicated on the valve.
4- WARNINGS
4.1- 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.
4.2- Tighten the G1" inlet, outlet and by-pass fittings of the valve (torque
wrench setting 310 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.
4.11- 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 150 kW (204 HP). As shown in
the chart, this means using pumps producing a flow rate of approx. 158
l/min. for maximum working pressures of 50 MPa (500 bar - 7250 psi),
and generating a pressure of approx. 34.5 MPa (345 bar - 4980 psi) for
maximum flow rates of 230 l/min.
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.
- -
5
MASS
°F kg
140 16
During use, never exceed
lbs
35.2
the