Patent ID: 8381401

Claim:
A method of assembly of a rotatable flapper valve to an interior of a conduit, the method comprising: fastening a valve plate to a valve axle; selecting first and second conduit sections; flaring first ends of the first and second conduit sections; subsequently forming first and second indentations in the flared first end of the first conduit section, wherein the first and second indentations in the first conduit section are formed substantially simultaneously with a cylindrical ram; forming first and second indentations in the flared first end of the second conduit section such that they will align with the first and second indentations in the flared first end of the first conduit section; placing the valve axle in the first and second indentations in the flared first end of the first conduit section; placing the flared first end of the second conduit section in contact with the flared first end of the first conduit section such that the first and second indentations in the first flared end of the second conduit section align with the first and second indentations of the flared first end of the first conduit section to partially surround the valve axle; and fastening the first flared end of the first conduit section to the first flared end of the second conduit section.