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A method of assembly of a rotatable flapper valve to an interior of a conduit features the ability to couple the valve plate to its axle outside of the conduit in an independent operation. The conduit is split into first and second sections each having a flared end and a pair of indentations for rec

A method of assembly of a rotatable flapper valve to an interior of a conduit features the ability to couple the valve plate to its axle outside of the conduit in an independent operation. The conduit is split into first and second sections each having a flared end and a pair of indentations for receipt of the valve axle. While separated, the valve axle is placed in a pair of indentations in one of the conduit sections and then the second conduit section is moved into abutting engagement such that its indentations also partially surround the axle. The first and second conduit sections are then joined by welding.

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1. 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

1. 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; andfastening the first flared end of the first conduit section to the first flared end of the second conduit section. 2. The method of claim 1 further comprising placing first and second bushings on opposite ends of the valve axle prior to placing the valve axle in the first and second indentations of the first conduit section. 3. The method of claim 1 further comprising: prior to fastening the first conduit section to the second conduit section, forming a notch in the first flared end of one of the first and second conduit sections. 4. The method of claim 1 wherein the valve plate is fastened to the valve axle by welding. 5. The method of claim 1 wherein the first flared end of the first conduit section is fastened to the first flared end of the second conduit section by welding. 6. The method of claim 1 wherein the flaring of the first ends of the first and second conduit sections includes flaring to substantially 90°. 7. The method of claim 1 wherein the first and second indentations in the second conduit section are formed substantially simultaneously with a cylindrical ram. 8. The method of claim 5 further comprising: prior to welding the first flared end of the first conduit section to the first flared end of the second conduit section, forming a notch in the first flared end of one of the first and second conduit sections. 9. The method of claim 1, wherein a rotational axis of the valve axle and the first and second indentations are offset from a longitudinal centerline of the first conduit section. 10. 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;forming first and second indentations in the flared first end of the first conduit section;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;fastening the first flared end of the first conduit section to the first flared end of the second conduit section;forming a notch in only the first flared end of the first conduit section; andwelding the first flared end of the first conduit section to the first flared end of the second conduit section at the notch to penetrate the first flared end of the second conduit section. 11. The method of claim 1, wherein the notch is formed above a central axis of the first conduit section. 12. The method of claim 11, further including forming another notch in the first flared end of the first conduit section below the central axis of the first conduit section and welding the first flared end of the first conduit section to the first flared end of the second conduit section at the another notch.