US 4,396,199 A · Fluid pressure sealing member for a valve

Abstract

A butterfly valve having a valve body and a valve disc which is selectively rotated to produce a fluid-tight engagement of a peripheral edge of the disc with an annular seal or wall defined by a portion of an internal fluid passage in the valve body uses an annular fluid pressure seal member mounted in an annular groove in the valve body adjacent to the annular seat. The seal member is a layered structure including a pair of coaxial metallic annular seal rings having aligned J-shaped inner sides arranged in a facing relationship and a resilient annular seal ring captured between the metallic rings and having a sealing surface aligned with an outside surface of the J-shaped sides. The sealing surface of the resilient seal ring and an outside surface of the J-shaped sides are arranged to produce the fluid-tight engagement with the peripheral edge of the valve disc.

Claims21

Dependent claims

A fluid seal comprising

a first annular seal ring having a J-shaped radially inward side,
a second annular seal ring having a J-shaped radially inward side arranged with a curved end thereof in a facing relationship with a curved end of said J-shaped radially inward side of said first seal ring and spaced therefrom and
a third annular seal ring captured between said first and second seal rings and having a radially inward seal face aligned with an outer surface of said J-shaped radially inward sides of said first and second seal rings.

Dependencies are inferred from the claim text.

Fluid pressure sealing member for a valve

Life of this patent

Fluid pressure sealing member for a valve

Life of this patent

Abstract

Claims21