Patent ID: 8418876

Claim:
A valve arrangement for location on a vessel for holding liquids, comprising: a supporting member configured to form a valve seat; a deformable sealing member located against said valve seat and arranged for deformation under an applied pressure to present a first gap between said sealing member and said valve seat in a region where pressure is applied to allow a liquid to be dispensed from the vessel via said valve arrangement, and a second gap between said sealing member and a valve seat in a region where pressure is applied, to allow air to enter said valve arrangement; a retaining member arranged to retain said deformable sealing member against said supporting member to a sufficient extent such that said deformable sealing member is held relative to said supporting member, but is free to deform to allow said first and second gaps to be presented when said deformable sealing member is deformed; wherein said supporting member, deformable sealing member and retaining member define therebetween a chamber, with said chamber being arranged for fluid communication with a vessel to which said valve arrangement is attached by at least one first aperture formed in said retaining member; and a filling valve located in said sealing member and arranged to provide fluid communication with said chamber to allow a user to add liquid to said chamber in a first direction during a filling operation but to prevent liquid passing in a second opposite direction.