Valve on a pourer regulating discharge from a bottle

A pourer has radial sealing flanges 2 through which a conduit 12 and air vent 10 pass; a chamber 6 in the conduit has an annular valve seat against which the moving component 14 of the valve seals. Ideally the moving component 14 is a ball and falls under gravity against the seat as the pourer is inverted but it could be a disc encircling the tubular vent. The conduit and vent can be entirely contained between the sealing flanges or extend out from either end. The conduit can have multiple inlets and may include a second valve. The conduit and air vent are preferably parallel and may be coaxial or adjacent. The body of the pourer may be rotatably mounted to the sealing flanges and include an asymmetric weight so that the air intake stays above the conduit outlet as the bottle 4 containing the pourer is tilted. There may be a baffle at the end of the conduit.