Inventors:
James M. Fowler - Missouri City TX
Bertram L. Morrison - Houston TX
Assignee:
ACF Industries, Incorporated - New York NY
International Classification:
F16K 302, F16K 506
Abstract:
A valve seal includes inner and outer concentric seal rings located side by side in a groove with the inner seal ring against the groove inner wall and the outer seal ring against the groove outer wall. Interfitting surfaces are provided on the seal rings to hold them together and prevent longitudinal movement between them. The groove and the seal rings cooperate to hold the seal rings in the groove. One of the seal rings is relatively soft and has good low pressure sealing characteristics while the other seal ring is relatively hard and has good high pressure sealing characteristics.