Ultimo aggiornamento: 30/09/21
2
INSTRUCTIONS
SELECTION
This product is to be used with clean water, even slightly mixed with normal detergents. For use with different or corrosive liquids,
please contact the PA Technical department. Appropriate filtration should be installed when using unpure liquids. Please make sure
that the valve is in line with the working data of the machine where it is to be installed (permissible pressure, maximum flow and rated
temperature of the system). In any case, the pressure of the machine must not exceed the permissible pressure marked on the valve.
OPERATION
The valve limits the maximum pressure in the circuit. In case of overpressure, a bypass port is opened through which the excess wa-
ter is discharged. During normal operation of the system, a spring-pulled shutter closes the bypass. The calibration pressure is ad-
justed by varying the spring thrust through the appropriate adjusting screw.
INSTALLATION
In a hot water machine, the valve should be mounted upstream of the boiler. In any case, even in cold water applications, if an
accidental overheating of the water is foreseen, the installation of thermal protection devices is advisable in order to keep the water
temperature below the maximum allowed temperature (MAX TEMPERATURE).
It is advisable to return the discharge flow to a tank. It is advisable for the tank to be equipped with baffles in order to reduce any tur-
bulence and air bubbles generated by the bypass flow, which could be damaging to the pump. When discharging in the atmosphere,
ensure to direct the valve properly in order to avoid serious injuries.
