Latest Update: 20/04/2018
2
DIMENSIONAL DRAWING
INSTRUCTIONS
SELECTION
This product is to be used with clean, fresh water, or water slightly additivated with ordinary detergents. For use involving harsh or even
corrosive fluids, always ask PA Technical department first. Appropriate filtration should be installed when using unclean fluids.
To select the right valve, always take in consideration rated running data of the system (rated pressure, max. flow rate and max.
temperature). In no case shall the system pressure exceed the
permissible pressure
marked on the valve.
INSTALLATION
On a water heating machine, fit the valve before
the heat generator
. This product is bound to be incorporated on a finished machine.
On a water heater, it is necessary to mount accessories that limit the accidental increase of fluid temperature.
Always install a safety valve to protect the pressurized outlet channel.
Select the right nozzle size, which allows a regular discharge into bypass of at least 5% of the total flow rate of the system. This will
keep a constant pressure setting and prevent pressure spikes at shut off which could damage the system.
By nozzle wearout, the pressure drops. When replacing the nozzle, reset the system to the original pressure level.
OPERATION
The valve regulates the max. system pressure through a piston, which acts on a cone that, normally positioned, closes the bypass
opening. A check valve cuts out the delivery section, the pressure of which controls the piston drive.
All adjustments should be carried out when the system is in operation and the nozzle is working.
IMPORTANT: The nut (pos.15) must never be removed, as it is a mechanical safety device that limits the max pressure and
prevents serious damage to persons and things.
DISCHARGE SYSTEM AND WATER ADDUCTION
The bypass conduct shall discharge outside of the machine or into a tank, but never directly into intake conduct. In case, it is advisable
to install a baffled tank.
