| 主权项 |
1. A check valve flapper for a check valve, comprising:
a flapper body comprising an upper edge, a lower edge, and an arcuate edge between the upper edge and the lower edge, wherein curvature of the arcuate edge substantially aligns with curvature of a stop of the check valve; and a hinge portion extending from the flapper body, the hinge portion comprising a lower ear, a middle ear, and an upper ear, wherein the lower ear, the middle ear, and the upper ear each comprise a hinge pin hole having a hinge pin hole diameter and an ear outer radius, and a ratio of the hinge pin hole diameter to the ear outer radius is between 0.83 and 0.91, wherein the lower ear aligns with the lower edge of the flapper body, the upper ear is offset from the upper edge of the flapper body, a check valve flapper length is defined between the lower edge of the flapper body and the upper edge of the flapper body, a middle ear offset is defined as a distance from the lower edge of the flapper body to an uppermost edge of the middle ear, a ratio of the check valve flapper length to the middle ear offset is between 2.08 and 2.11, the lower ear has a lower ear width, and a ratio of the check valve flapper length to the lower ear width is between 6.72 and 6.90. |
