Rotating joint

Claim 1

A rotating joint for connecting together a pair of pipes, one of which is rotatable relative to the other, for flowing fluid under high pressure therethrough, comprising: a mandrel having a longitudinal bore extending for at least part of the length thereof and lateral port means at an intermediate portion of the mandrel; a sleeve surrounding said mandrel; means mounting said sleeve on said mandrel for relative rotation therebetween; longitudinally spaCed annular lip-type seal means between said mandrel and said sleeve; said sleeve having a fluid passage disposed between said seal means and communicating with said lateral port means to thereby establish fluid flow through the rotating joint with the pressure thereof acting substantially equally in opposite longitudinal directions a floating seal ring disposed on each side of said fluid passage in said sleeve between said sleeve and said mandrel, and each being located longitudinally between said fluid passage and one of said seal means; each of said seal rings being spaced longitudinally inwardly from the seal means therewith for providing an annular space which may also be filled with grease; and said sleeve having a grease injection passage for each of said seal means located longitudinally outwardly thereof on the opposite side of said seal means from said annular space and said floating seal ring whereby grease may be injected into each of said seal means and said annular space for filling all spaces with said seal means and said annular space.