US Patent 8640904 Flow control valve for dispensing a source of fluid

A flow control valve is described and which includes a first portion, and a second portion, and wherein the first portion rotates relative to the second portion and wherein the invention further includes a rigid locking member which cooperates with a resilient sealing and biasing member which is carried to positions which, on the one hand, either seals the vessel to prevent the escape of fluid from the vessel, or which allows the convenient dispensing of fluid from the vessel.