Patent ID: 7225831

Claim:
A self closing valve comprising: a valve body having a flow passage therethrough; a metal valve seal ring having first and second sealing surfaces disposed within the valve body about a portion of the flow passage; a valve member mounted within the flow passage for movement between an open position and at least one of at least two closed positions, the valve member having a seating surface for engagement with at least one of the sealing surfaces of the metal valve seal ring in at least one of the closed positions; a biasing element associated with the valve member for urging the valve member toward the closed positions; and the metal valve seal ring being formed as an annular ring having first and second annular fingers extending radially inwardly of the flow passage portion to provide first and second sealing surfaces spaced apart along the longitudinal axis of said portion of flow passage, the first annular finger being normally inclined toward the second annular finger and the first and second sealing surfaces each being coined to each provide a surface portion for mating with a respective portion of the seating surface for selective sealing engagement therewith when the valve member is in a respective at least one of the closed positions.