Seal Stack Assembly for Reciprocating Pump

A sealing assembly, comprising:

• a first cavity and a second cavity separate from the first cavity;
• a plurality of first shaft seals disposed within the first cavity;
• and
• a plurality of second shaft seals disposed within the second cavity such that the second shaft seals are spaced apart from the first shaft seals in the first cavity, the second shaft seals being different from the first shaft seals;
• wherein the first shaft seals are stacked together along a first direction, and
• wherein the second shaft seals are stacked together along a second direction opposite the first direction.

A sealing assembly configured for use in a pump assembly having a housing and a shaft movably disposed in the housing, the sealing assembly comprising:

• a spacer extending along a longitudinal axis between a first end and a second end spaced apart from the first end;
• a plurality of stacked first shaft seals disposed adjacent the first end of the spacer and extending along the longitudinal axis;
• and
• a plurality of stacked second shaft seals disposed adjacent the second end of the spacer and extending along the longitudinal axis, the second shaft seals being different from the first shaft seals,
• wherein the first shaft seals are configured to provide a first seal against the shaft at a first temperature, the first temperature being a cryogenic temperature, and wherein the second shaft seals are configured to provide a second seal against the shaft at a second temperature having a higher temperature than the first temperature.