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Les langues disponibles
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= ENGLISH =
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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
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 PNVU2 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).
1.4- Since the PNVU2 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.
1.5- 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.
1.6- 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.
1.7- 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
MPa
bar
21
210
WITH
THE
INSTRUCTIONS
Max TEMPERATURE
p.s.i.
° C
3045
60
2- PACKAGE
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.
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 and follow these steps:
3.2.1- Unscrew the knob pos. 2 in order to completely release
the springs.
3.2.2- Open the gun or the water control device and start the
system. Make sure that the air contained in it is fully ejected.
3.2.3- Start the pneumatic circuit and set the pneumatic
cylinder of the valve in the "ON" position.
3.2.4- Keeping the gun or the water control device open, start
adjusting the hydraulic 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.
3.2.5- Lock the knob pos. 2 by tightening the ring nut pos. 3 on
it.
3.2.6- In order to obtain working pressures lower than the
maximum set pressure, unloose the ring nut pos. 3 and turn the
knob pos. 2 counter clockwise.
-
-
7
MASS
° F
kg
140
9
lbs
19.8
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