| 摘要 |
A valve including an annular groove in the valve body at the periphery of the valve disc. A fire-safe seal provides a fluid seal between the valve disc and the valve passageway. A seal is disposed in the annular groove having an axial projection for retaining the seal and a sealing surface projecting radially inwardly in the passageway and being engageable by the peripheral edge of the valve disc. This sealing surface has an inverted resilient J-shaped portion. The seal also has a circumferential slot for receiving a metal ring to provide circumferential stability. A retaining ring having a blocking groove extends axially and inwardly thereof for receiving the distal end of the resilient J-shaped portion.
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