Importance

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Abstract

A high pressure seal structure to seal against fluid pressure around a cylinder member movably. The structure includes an integral circular metal sealing ring including a pair of first circular sealing lips having a cross-section of chevron shape axially opening in a first direction to flexibly extend with a first inner lip in sealing relation against the cylindrical surface of the cylinder member and with the first outer lip in sealing relation against a cylindrical wall formed in the housing. Also included is a pair of second circular sealing lips having a cross-section of chevron shape axially opening in a second direction to flexibly extend with a second inner lip in sealing relation against the cylindrical surface and with a second outer lip in sealing relation against the cylindrical wall. A deformable inner sealing ring having a triangular cross-section is closely fitted in the space defined by the first inner lip, the second inner lip, and the cylindrical surface. A deformable outer sealing ring having a triangular cross-section is closely fitted in the space defined by the first outer lip, the second outer lip, and the cylindrical wall. A first circular and moveable and metal engagement ring having a cross-section of chevron shape axially extends into the opening form by the first sealing lips to expand the first sealing lips. A second circular and moveable metal engagement ring having a cross-section of chevron shape axially extends the opening formed by the second sealing lips to expand the second sealing lips. An axially moveable circular adjustment structure is provided to urge the first engagement ring and the second ring together for expanding the first sealing lips and the second sealing lips.

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First Claim