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Les langues disponibles
Les langues disponibles
= ENGLISH =
FLOW RATE
g.p.m.
l/min.
(USA)
min-max
min-max
20-230 5.2-61
«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 PNRA2 automatic pressure regulator is a manually-
adjustable, pressure-operated device which, according to its setting,
limits the pump/system pressure by conveying the excess of water to
the by-pass.
Moreover, when the outlet flow is blocked, this device totally releases
the flow – and keeps under pressure the portion of the system
following the valve, while it reduces the pressure in the portion of the
system preceding the valve.
1.2- The pneumatic control of the valve allows to cut in (ON) or to cut
out (OFF) the adjusted hydraulic pressure. This function is particularly
suited for automatic working cycles and remote controls. Moreover,
the "OFF" position allows to start the pump at zero pressure, i.e.
without the motor being under stress.
1.3- In order to operate the pneumatic cylinder it is necessary to use
compressed air with a value ranging from 0,6 to 0,8 MPa (6-8 bar). In
order to correctly control the cylinder we suggest you use a 5/2-way
pneumatic valve and two flow regulators to define the operating time
(see diagram - table A).
2- WARNINGS:
2.1- To ensure the tightness of the fittings used to connect the valve to
the system, interpose a metal washer with a rubber ring or insert an
appropriate sealing on the thread and tighten them to the torque
indicated in the table.
THREADING
G1"
G3/4"
G1"1/4
TECHNICAL FEATURES
Max. PRESURE
MPa
bar
p.s.i.
21
210
3045
TORQUE [Nm]
200 ± 5%
120 ± 5%
300 ± 5%
Max. TEMPERATURE
°C
85
2.2- 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 60 kW (81.5 HP). As shown
in the chart (Tav.1) , this means using pumps producing a flow rate of
approx. 150 l/min. for maximum working pressures of 21 MPa (210
bar - 3045 psi), and generating a pressure of approx. 13.5 MPa (135
bar-1958 psi) for maximum flow rates of 230 l/min.
2.3- Use guns or other control devices ensuring a perfect seal when
closed. Leakages may compromise the correct functioning of the
valve.
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 exploded view (page 2).
3.2- Connect the valve to the water system and to the pneumatic
circuit, then follow these steps:
3.3- Unloose the ring nut pos. 3.
3.4- Unscrew the knob pos. 2 in order to completely release the
springs.
3.5- Open the gun or the water control device and start the system.
Make sure that the air contained in it is fully ejected.
3.6- Keeping the gun or the water control device open and the
pneumatic cylinder closed, start adjusting the pressure by screwing
down the knob pos.2. Alternate the adjusting operations with a few
openings and closings of the gun or of the control device. When the
desired 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.
3.7- Screw down the ring nut pos. 3 up to contact with the knob pos.
2 and tighten.
3.8- In order to obtain working pressures lower than the maximum
set pressure, unscrew the knob pos. 2.
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.
The information contained in this document may be modified without
notice.
-
-
5
MASS
°F
kg
185
5
During
use,
never
values
of
pressure,
flow-rate
lbs
11
exceed
the
and
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