Patent ID: 8881957
Filing Date: 2014-11-11
Classification: B65D,F16K,Y10T

Abstract:
1. A relief valve for a liquid container, the valve comprising: a substantially conical body extending into the container, and tapering inwardly away from an external wall of the container, at least one air inlet passage through the substantially conical body; a flexible diaphragm extending over the conical body, being attached at its outer periphery around the substantially conical body and having a resilient lip surrounding the substantially conical body above the air inlet passage so as to seal the air inlet passage until the pressure within the container falls below a predetermined level; and a cylindrical post upstanding from the conical body, wherein the resilient lip is a tight fit against the cylindrical post to form the seal; and wherein an annular barrier surrounds at least the side of the relief valve facing a liquid outlet from the container, said annular barrier extending axially to a level above the top of an annular wall surrounding a central opening defining the liquid outlet from the container.