Patent ID: 7874369

Claim:
A stuffing box having a mechanical seal assembly for a pump, comprising: an outer housing having a longitudinal bore therethrough; a seal housing having a longitudinal bore therethrough, wherein the seal housing is disposed in the outer housing bore; first and second semi-annular mechanical seals, each at least partially disposed in the seal housing bore, and each having two radial faces, each radial face of each seal abutting a radial face of the other seal; a seal sleeve having a longitudinal bore therethrough and rotatable relative to the seal housing; third and fourth semi-annular mechanical seals, each at least partially disposed in the seal sleeve bore, each having two radial faces, each radial face of each seal abutting a radial face of the other seal, at least one of the third and fourth seals rotationally coupled to the seal sleeve but axially movable relative to the seal sleeve; one or more biasing members biasing longitudinal faces of the third and fourth seals into engagement with longitudinal faces of the first and second seals; and an internal sleeve that extends through the seal sleeve bore.