Pressure energized rotary hydraulic seal
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United States of America Patent
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-
Oct 20, 1987
Grant Date -
N/A
app pub date -
Oct 6, 1986
filing date -
Oct 6, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pressure actuated hydraulic seal ring is disclosed for sealing to a rotating cylindrical member. The seal ring clears the rotating member when no hydraulic fluid is applied to its outer diameter. When hydraulic pressure is introduced to its outer diameter, a net compressive force is applied to the seal ring causing it to collapse in radially. The rotating cylindrical member includes a port through an external cylindrical surface which communicates with a conduit in the wall of the cylindrical member. The seal ring includes two inner sealing surfaces which straddle the port in the cylindrical surface where the ring is non-rotatingly supported by a ring retainer disposed about the exterior of the cylindrical surface. A passage extends from the outer diameter of the seal ring to a channel between the two inner sealing surfaces. When the seal ring collapses radially, the two sealing surfaces seal against the rotating external cylindrical surface providing a hydraulic fluid communication path from the outer diameter via the passage in the seal ring, the channel between the two inner sealing surface and the port and the conduit of the cylindrical member. The seal ring may advantageously be used to communicate hydraulic fluid for operation of a valve in the flow path of a rotating tubular member.
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