Ultimo aggiornamento: 15/11/19
3
DISCHARGE SYSTEM AND WATER ADDUCTION
The valve can be fitted on machines fed directly by the water system with bypass recycle to the pump or on machines fed by a tank
where the bypass flow is also discharged.
In certain conditions, depending on installation and in particular:
o
through feeding from tank,
o
with long delivery lines or strong difference in level,
o
with low flow rate and small flow factor nozzles,
it could occur that at gun opening, a delay in the reset of the working pressure is revealed or a pulsation of the valve. To avoid such
inconveniences, it is necessary to guarantee always a pressure of at least 3-5 bar in the bypass line. This pressure can be obtained by
throttling the bypass line in one of the following ways:
o
fitting in the bypass channel a 3/8” hose instead of 1/2"
o
fitting in the bypass channel a rigid tube of a sufficiently small diameter
o
inserting in the bypass channel a connector with an adequate orifice diameter
(available on request if not already included; see table)
In the case of feeding from the tank where also the bypass flow is discharged, it would be advisable to fit in the feed line of the machine
a low pressure pump that guarantees a feed pressure of the high pressure pump of 3-
5 bar (See paragraph “EXAMPLES OF
INSTALL
ATION” Picture 4).
It is advisable that the tank be provided with deflectors to reduce eventual turbulence and air bubbles, generated by the intake of the
bypass flow, which could be harmful for the pump.
In the case of direct pump recycle of the bypass flow and if bypass conditions are foreseen frequently or for a long time, it is advisable to
fit a thermal protector valve (VT3 or VT6) in order to avoid dangerous overheating of recycled water.
PRESSURE ADJUSTMENT/SETTING
The desired working pressure must be adjusted while the system is in operation and the gun is opened. Adjust the pressure by screwing
or unscrewing the adjustment nut, taking care to lock the threaded piston with a second wrench, as shown in the picture.
The operation is easier if the co
rrect nozzle has been chosen (see paragraph “installation”).
Pressure is increased by screwing the adjustment nut. In case pressure does not increase despite screwing of the nut,
do not force
,
but check that the nozzle flow rate/pressure ratio is correct.
Connector available on request
Flow (l/min)
Ø Bore (mm)
Thread
Part Number
9-15
2,7
G 3/8” M
60.2926.51
15-25
4.0
G 3/8” M
60.2927.51
25-35
4.5
G 3/8” M
60.2929.51
40
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