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US 4,394,003 AGranted
Cryogenic butterfly valve with bi-directional sealing capability
AssigneeWalworth Company
InventorRitchie W. Whitaker
Life of this patent
Estimating the term…
Abstract
A valve seal for a cryogenic butterfly valve comprising a reclining U-shaped resilient seal with the annular edge of the longer radially outer leg being gripped in the valve body to form a static seal. Pressure in one direction acts around the outer surface of the seal to pivot it about the static seal against the valve disc. Pressure in the other direction acts between the legs of the seal ring and, because the seal is restrained by the valve body against pivoting away from the valve disc, the pressure separates the legs to bias the radially inner leg inwardly against the valve disc.
Claims8
In a valve comprising:
- a valve body having a flow passage therethrough;
- a valve disc rotatably mounted in said body between valve open and valve closed positions;
- an annular sealing surface around the periphery of said valve disc;
- and
- an annular sealing device on said body surrounding said sealing surface;
- said sealing device comprising:
- an annular relatively wide recess having a relatively narrow opening therefrom;
- a resilient seal ring in said recess;
- said seal ring being of generally reclining-U configuration, with legs transverse to the axis of rotation of said disc;
- the radially outer leg being longer than the inner leg so that pressure acting against the outer surface of said seal ring will bias same radially inward;
- means clamping and sealing the annular edge of said outer leg in said body;
- and
- a radially extending, dynamic seal inward extension on the end of said inner leg extending through said narrow opening into sealing engagement with said disc.
10 more elements
Dependencies are inferred from the claim text.