Safety valve (two-way)

Safety valve (two-way)

This valve operates in two different ways according to the pressure inside the tank:

• When the pressure inside the tank exceeds an established level 130-165 mbar (detail A) it pushes case (2) to overcome the load of spring (3) and allow excess pressure to drain off outside through breather pipe (4) to maintain conditions of safety;
• When a vacuum of < 20 mbar is set up in the tank due to the removal of fuel (detail B), plate (1) overcomes the load of spring (5) to open a passage that allows air from vent pipe (4) to enter the tank and restore the pressure to specified values (ventilation function).

The two-way safety valve is two-coloured (WHITE-LIGHT BLUE) and must be fitted the right way round: the white side bearing the word "TANK" (TANK END) must be postioned toward the tank.