Patent ID: 9605786
Date: 2017-03-28
CPC Classifications: B63B,F16L

Claim:
1. A sealed fluid swivel comprising: an inner housing assembly positioned coaxially about a longitudinal axis; an outer housing positioned coaxially about the inner housing assembly and arranged and designed to rotate relative to the inner housing assembly about the longitudinal axis, the outer housing including: an upper seal disposed in the upper annular seal recess and a lower seal disposed in the lower annular seal recess, the upper and lower seals for sealing between the outer housing and annular, axially-facing surfaces of the inner housing assembly; an inner housing bore disposed in the inner housing assembly and communicating with the annular passage, the inner housing bore arranged to carry fluid having a fluid pressure to the annular passage, the fluid allowed to fill a small space between the inner housing assembly and outer housing from the radially inward-facing annular surface of the outer housing to the upper and lower seals; wherein the axial height of the annular passage is smaller than the internal diameter of the radial flow passage, the width being about twice the axial height of the annular passage, thereby allowing the axial distance between the upper and lower seals to be minimized to reduce the effective pressure height (H