NABIC 256B Pipe Interrupter - Type DB (Membrane Type) - Cat 4
The NABIC 256B is classified as a DB type suitable for protecting up to fluid category 4. The NABIC 256B has a moving element which seals the ventilation gaps during normal flow conditions. When negative pressures occur on the inlet side which could cause siphonage, the membrane retracts seals the flow ports and simultaneously vents the outlet side of the pipe interrupter. NABIC Valves now come with an Industry leading 5 Year Guarantee.
Flowstar, our parent company has an interesting article relating to Backflow Prevention in the Technical section on their website.
Sizes: 3/8" (DN10), 1/2" (DN15), 3/4" (DN20)
Connections: Male BSP Inlet x Male BSP Outlet
Materials: Brass body, Plastic internals, EPDM Membrane
Pressure: 10 Barg Max
Temperature: 60 degC Max