Technical Features - Pratissoli PNR 1520 Mode D'emploi

= ENGLISH =
Max FLOW RATE
MODEL
L/min
PNR1520 240
«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 PNR1520 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).
2- INSTRUCTIONS FOR
SETTING:
The positions mentioned in the following instructions refer to those
shown in the spare parts catalogue (page 2).
2.1- Installation
2.1.1- Fit the O-Ring pos. 38 into the seat of the valve body pos.23.
2.1.2- Set the valve on the pump head taking care that the O-Ring pos.
38 stays in place correctly.
2.1.3- Slightly lubricate the threads of the four screws pos. 48 with
Lithium grease and tighten by means of a dynamometric wrench
(torque wrench setting as stated in the exploded view – page 2).
2.1.4- In order to obtain the sealing between the nipple pos.56 or
the cap pos.57 and the valve body, use the conical seal pos.55
(Tab. C – 380Nm) please contact the after-sales service of
Interpump Group in case of doubts).
2.1.5- 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.
2.1.6- Connect the valve to the water system and to the pneumatic
circuit, then follow these steps:
2.2- Pressure setting
2.2.1- Open the pneumatic pressure regulator completely in order to
control the valve.
2.2.2- Start the hydraulic system on which the valve is fitted and make
sure that the air contained in it is fully ejected.

TECHNICAL FEATURES

Max PRESSURE
g.p.m.
MPa
(USA)
63.4 150
INSTALLATION AND PRESSURE
Max TEMPERATURE
bar p.s.i.
1500 21755
2.2.3- 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.
2.2.4- In case you decide to change the adjusted hydraulic pressure
later, follow the procedure stated in paragraph 2.2.3 again.
2.2.5 The maximum pneumatic pressure allowed within the
PNR1520 valve must not exceed the below-mentioned
values:
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
temperature as stated in this document and/or
indicated on the valve.
3- WARNINGS
3.1- 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.
3.2- Tighten the fittings for the valve connections as follows:
Outlet fitting - By-pass fitting
3.3- 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.
3.4- 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 345 kW (470 HP). As shown
in the chart, this means using pumps producing a flow rate of approx.
120 l/min. for maximum working pressures of 150 MPa (1500 bar -
21755 psi), and generating a pressure of approx. 75 MPa (750 bar-
10875 psi) for maximum flow rates of 240 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
°C °F
40 104
During use,
values of pressure,
Coppia / Torque Nm ±5%
450 160
G1"1/4 M24x1,5
Thread
MASS
kg lbs
14 30.8
never exceed the
flow-rate and
315
M36x2