Niro Soavi S.p.A
3.7.1.1 OPERATION
The valve consists of a ball maintained in place in its seat by a spring, which
allows it to open when the calibration set point is exceeded.
The spring loading should not be changed as this would modify the valve
opening value and cause the immediate forfeiture of the safety conditions
established by NIRO-SOAVI and the guarantee. Therefore a seal has been
applied to the spring load adjustment nut.
In the event the calibration setting is exceeded, the valve opens automatically
and lets the product flow out of the discharge pipe; it closes again when
pressure reduces below the opening value. This can be achieved by adjusting
the pressure regulating device until the valve is closing, or reducing the pump
speed in case of high pressure pumps.
Once the valve has closed again, normal operating pressure can be re-
established, provided the machine has not been damaged and the cause of
overpressure has been addressed.
ATTENTION: The discharge pipe must ALWAYS be directed downwards to
avoid harming the operator; the Customer shall be responsible to install a
funnel to collect the outcoming product and carry it to the drainage
system
ATTENTION: Dispose of any waste fluids as prescribed by the laws in
force locally.
ATTENTION: the valve seat of the overpressure relief valve is damaged to
some extent each time the valve blows. This will lower the pressure
setpoint of the safety valve. Therefore it is necessary to replace seat and
ball to recover the original setpoint conditions.
3C001E0C.DOC 3.7.2
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