Abstract: A vacuum valve that forms a tight vacuum seal is disclosed. The valve incorporates a hollow, malleable, metallic O-ring that deforms and conforms readily under pressure to seal the space between a movable valve member and a valve seat. When the valve is closed, the O-ring is compressed between opposed machined surfaces of the valve member and the valve seat, readily deforming and conforming to those surfaces, thus creating a vacuum-tight seal thereat.

Abstract: A quick disconnect fluid injection assembly for delivering a cryogenic fluid into a container is disclosed. A passage, having an entrance and an exit, provides access to the inside of the container. A pre-valve adjacent to the entrance blocks the passage to exclude dirt and debris and a fluid check valve adjacent to the exit prevents backflow of fluid from the container through the passage. In use, an elongated injector is inserted into the passage. The injector first opens the pre-valve and then the fluid check valve and thereafter injects cryogenic fluid through the check valve into the container.