Patent ID: 7225829

Claim:
A flow-control valve assembly comprising: a) a valve body having a longitudinal axis and having a valve seat including a completely-annular radially-inner valve seat portion, including an at-least-partially-annular radially-outer valve seat portion, and including a bypass-flow-channel exit disposed between the radially-inner and radially-outer valve seat portions; and b) a resilient flow control disposed in the valve body and having an upstream top surface, a downstream bottom surface, and a through passage, wherein the bottom surface seats against the radially-outer valve seat portion under a lower and a higher fluid pressure against the top surface, wherein the through passage is disposed radially inward of the radially-inner valve seat portion, wherein the bottom surface is spaced apart from the radially-inner valve seat portion under the lower fluid pressure exposing the bypass-flow channel exit, and wherein the bottom surface seats against the radially-inner valve seat portion under the higher fluid pressure blocking the bypass-flow-channel exit.