초록 ▼

Disclosed is a flexible sealing ring for a valve having a generally S-shaped cross-section and an extension from one end of that S-shape. The extension is mounted on the valve body and serves as a cantilever means for the sealing ring which is thus sealingly engagable with the peripheral sealing sur

Disclosed is a flexible sealing ring for a valve having a generally S-shaped cross-section and an extension from one end of that S-shape. The extension is mounted on the valve body and serves as a cantilever means for the sealing ring which is thus sealingly engagable with the peripheral sealing surface of a movable valve member pivotally positioned within the valve passageway. The sealing ring is formed from materials capable of withstanding high temperatures (1000°F.) for sustained periods without impairment of its\sealing capacity. The sealing ring may be used in cooperative combination with other sealing rings, including heat destructible materials such as “Teflon”, to form valve seal means effective over a range of temperatures and pressures, including firesafe valve seal means.

대표청구항 ▼

In a valve having a valve body, a passageway through said valve body, a valving member retained within said passageway and pivotal about an axis transverse to said passageway between an open and a closed position for interrupting fluid flows through said valve in said passageway over a range of diff

In a valve having a valve body, a passageway through said valve body, a valving member retained within said passageway and pivotal about an axis transverse to said passageway between an open and a closed position for interrupting fluid flows through said valve in said passageway over a range of different pressures and temperatures across said valve, and a firesafe sealing means for providing a fluid seal between said valving member and said passageway interior surface at normal temperatures and high temperatures, the improvement comprising, in said firesafe sealing means, the combination of: annular groove means in said passageway disposed in radial alignment with the peripheral sealing surface of said valving member when that valving member is in a closed position; a first resilient sealing ring, disposed in said groove means and projecting radially inwardly therefrom into said passageway, having a primary sealing surface formed on the inner periphery thereof engagable by the peripheral sealing surface of said valving member; and a second flexible sealing ring, also disposed in said groove means and projecting radially inwardly therefrom into said passageway, having a cross-sectional configuration including a curvilinear S-shaped cross-section region and an extension from said S-shaped cross-section, said extension retained within said groove means so as to provide cantilever means for said second flexible sealing ring.