Overfill prevention valve – Model 446



Overfill prevention valves are disigned to prevent the overfill of liquid (fuel) in a storage tank ensuring the positive shut-off of product delivery. The valve can be installed either on underground (UST) or aboveground (AST) storage tank and in fact is designed for working correctly at high pressure.

The valve can be installed under the manhole lid of the tank through BSP threaded flange or sleeve, there is no need to remove the manlid.


• Gravity or pumped filling* (factory tested)
• Positive shut-off* (factory tested)
• Fast loading operation 850 lt/min* (factory tested)
• Fast drain hose emptying (less than 30 sec/mt.)* (factory tested)
• Remote or direct filling
• Maximum fuel storage capacity
• No risk of fire or fuel leaking
• Easy installation


Where liquid is not clear a strainer before the valve is strongly recommended in order to guarantee a proper working of the valve. Dirty particles in fact may damage the moving components causing malfunctioning.


The overfill prevention valve Model 446 is available also in stainless steel AISI 316L, sizes 2″ and 3″ and can be used in tanks with ad blue, chemicals.

See here other types of all available Ridart overfill prevention valves.

Download datasheet in *.pdf

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Housing Aluminium
Available sizes 2", 3"
Type of filling Gravity or pumped
Float PE-HD
Working pressure 4 bar
Seal Viton
Filling capacity 60 l/min-850 l/min
Product Diesel, gasoline
Thread BSP ISO 288-1