Patent ID: 8181669

Claim:
A check valve comprising: a valve housing having at least one valve opening; at least one petal disposed in the valve housing, the at least one petal configured to substantially cover the at least one valve opening when the at least one petal is in a closed position and rotable about a hinge axis toward an open position thereby allowing fluid to flow through the at least one valve opening; and at least one compliant petal stop to prevent rotation of the at least one petal beyond the open position, the compliant petal stop including: a stop pin extending from a first post to a second post of the valve housing; and at least one compliant stop pin collar disposed at the stop pin and substantially enclosing the stop pin, the stop pin collar configured to absorb impact loads from impact between the at least one petal and the stop pin collar, the at least one stop pin collar including at least one conical section having a constant thickness inner wall tapering toward the stop pin.