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The low pressure liquid transfer devices provide a means for dispensing, liquid nitrogen from a vacuum-insulated container. Flow-rates up to approx. 5 litres per minute can be achieved.

The driving force for the liquid withdrawal is provided by sealing the neck tube opening of the container and allowing the gas pressure to build up, as the liquid evaporates. A pressure relief valve is set at 0.5 Kg./Cm2 prevents the pressure inside the container from rising above this value.

A rubber plug forms the pressure seal between the container neck tube and the device. The chain secured to the container handle prevents the device from being forced out of the neck-tube by the internal pressure. Pressuring valve is used to release the container pressure before removal of the transfer device. The liquid transfer valve is a ball-type valve which goes from fully-closed to fully open in one quarter turn.