Cryogenic fluid shut-off valve

A shut-off valve for use with cryogenic fluid, the shut-off valve comprising:

• a valve body defining a flow path, an inlet of the flow path, an outlet of the flow path, and a valve seat located along the flow path between the inlet and the outlet;
• a bonnet coupled to the valve body and defining a bonnet chamber that extends along a longitudinal axis of the bonnet and connects to the flow path;
• a plug configured to slide along the longitudinal axis of the bonnet between a closed position at which the plug sealingly engages the valve seat and an open position at which the plug is disengaged from the valve seat;
• a stem coupled to the plug and housed within the bonnet chamber of the bonnet, wherein the stem is configured to slide along the longitudinal axis of the bonnet to cause the plug to slide between the open position and the closed position, wherein the stem includes a lower buffer at a lower end of the stem and an upper buffer at an upper end of the stem, wherein each of the lower buffer and the upper buffer includes ringed arms that are stacked and spaced apart from each other along an axis of the stem, and wherein the ringed arms are configured to sealing engage an inner surface of the bonnet that defines the bonnet chamber;
• a spindle comprising external threads and operatively coupled to the stem, wherein the spindle is configured to move along the longitudinal axis of the bonnet as the spindle is rotated via the external threads about the longitudinal axis to cause the stem to slide linearly along the longitudinal axis;
• and
• a pivot ball positioned between and operatively coupled to the stem and the spindle, wherein the pivot ball is configured to translate linear and rotational movement of the spindle into linear movement of the stem and the plug.