Patent ID: 8402999

Claim:
A tap for delivering liquid comprising: a body equipped with: a connection part adapted and configured for coupling to a vessel of liquid to be delivered and a liquid delivering passage; stem means adapted to open and close the liquid delivering passage; and elastic actuating means adapted to actuate the stem means in their delivery opening and closing positions; wherein the tap further comprises: air inlet means positioned on the body; air outlet means adjacent to the inside of the vessel; a sealing valve adapted to open and close an air passage between the air inlet means and the air outlet means; and a non-return valve placed in the body between the air outlet means and a vessel interior, the non-return valve comprising a plurality of teeth integral to and extending from the body, the plurality of teeth substantially surrounding and adjacent to a cone-shaped sealing geometry, and a ball received within a cage defined by the plurality of teeth, the ball being adapted to be guided and driven by a pressure difference between outside the tap and inside the vessel; wherein the stem means are equipped with an elongated body that terminates at one end with a sealing tooth coupled with the elastic actuating means and at an opposite end with a self-centering frustum-of-cone part, the elongated body being equipped with a sealing seat comprising a tooth, a recess, and a liquid sealing area that cooperates with the sealing valve; and wherein the stem means are further equipped with: wings for centering the stem means in the cylinder of the body; a seat for a sealing O-ring; and a liquid discharge hole with a drain channel that is coaxial with a vertical axis of the cylinder.