Pipe Interrupters are anti-pollution devices used to prevent siphonage or backflow in pipework by creating an open vent to atmosphere. Conforming to the requirements of EN1717 they are suitable for working pressures up to 10 bar and temperatures up to 60 Deg C.

The Fig 256A is classified as a DC type suitable for protecting up to fluid category 5. Incorporating ventilation ports that are totally unrestricted and permanent, water is guided past these air vents using a venturi type nozzle. Since they are constantly open to atmosphere this stops siphonage and allows the escape of water in the event of backflow. NABIC Valves now come with an Industry leading 5 Year Guarantee.

Nabic Fig 256A Pipe Interrupter - Type DC (Permanent Vent)

Sizes: 3/8" (DN10), 1/2" (DN15), 3/4" (DN20)
Connections: Male BSP Inlet x Male BSP Outlet
Materials: Brass body, Plastic internals, EPDM O-rings
Pressure: 10 Barg Max
Temperature: 60 degC Max

Note: The 1" is no-longer manufactured. The N-256A-015S is a low flow version of the standard N-256A-015.

Nabic 256A Pipe Interrupter Datasheet
Nabic 256A Installation Operating & Maintenance Instructions