Coupler device for a beverage dispensing system

A coupler device for fluidly connecting a beverage chamber of a beverage container to a beverage dispensing line, the coupler device comprising:

• a housing with a coupling organ for detachably coupling the housing to the beverage container;
• a beverage conduit extending through the housing between an inlet which is configured for being connected to a first dispensing line part attached to the beverage container and an outlet which is configured for being connected a second dispensing line part attached to a dispenser;
• and
• a broach element movably arranged relative to the housing for broaching the beverage container in order to fluidly connect the beverage chamber to the first dispensing line part;
• wherein, in use of the coupler device when coupled to the beverage container, the beverage conduit includes a horizontally extending beverage conduit section that defines a horizontal flow path for beverage;
• and
• wherein, at the beverage conduit section, the coupler device comprises a reflux valve arranged for limiting a reflux flow of the beverage through the beverage conduit from the outlet to the inlet of the coupler device, the reflux valve having a movable valve element which is movable relative to the horizontally extending beverage conduit section in a reflux flow direction along the horizontal flow path for enabling a beverage pressure surge in the dispensing line to travel across the reflux valve.