Patent ID: 11913305
Assignee: BAKER HUGHES OILFIELD OPERATIONS LLC
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 7:
8. A flapper valve, comprising:
a housing;
a flapper articulated to the housing;
a flapper seat receptive to the flapper in a flapper closed position, the flapper seat including:
a body having a metal face seal positioned to make sealing contact with the flapper in selected flapper positions; and
a flexible metal arm extending arcuately from the body, the arm having a convex surface and a concave surface, the convex surface being radially outwardly disposed of the concave surface relative to the seal arrangement, the arm including a metal contact seal, positioned to make metal-to-metal sealing contact with the flapper in selected flapper positions, the arm configured to bow radially during the metal-to-metal sealing contact, the degree of bowing being limited to elastic deformation by contact of the metal face seal with the flapper.