Abstract: A rotary joint for a rotating heat exchanging drum directly attached to the end of the drum journal utilizes a flange and adapter to mount a seal on the journal and the joint body is fixed with respect to the journal and supports a seal plate in which an annular seal is biased toward the journal mounted plate by springs. The body mounted seal includes differential pressure area surfaces to balance the fluid pressures imposed thereon, and the springs are isolated from the fluid within the body. The joint eliminates metal-to-metal engagement of moving parts, and the seals may be readily replaced when worn.

Abstract: The invention pertains to a rotary joint wherein pressures imposed upon the joint by the pressurized medium therein are internally compensated. The joint is characterized by its ability to accommodate axial drum expansion, minimize rotative friction and the major joint components are self-aligning with respect to rotary motion. The basic components include a body member receiving an end of a nipple member, one of the members being fixed against axial displacement. A single annular nipple seal mounted upon the nipple member within the body member chamber engaging a seal ring constitutes the sole mechanical connection between the body and nipple members, and the fact that the nipple seal is axially displaceable upon the nipple member permits an internal compensation of axial forces produced within the joint, permits accommodation of axial thermal expansion of the joint components, and the spherical configuration of the nipple seal provides self alignment between the body and nipple members.