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A butterfly valve assembly includes a unitary flow body and a unitary valve element. The unitary valve element is rotationally mounted within the flow body and includes a rotationally mounted shaft and a butterfly plate that is formed integral to the shaft. The butterfly valve assembly can withstand

A butterfly valve assembly includes a unitary flow body and a unitary valve element. The unitary valve element is rotationally mounted within the flow body and includes a rotationally mounted shaft and a butterfly plate that is formed integral to the shaft. The butterfly valve assembly can withstand the maximum drive torque supplied from an associated actuator, while at the same time meeting a desired level of flow performance, and allows the unitary valve element to be installed up through the pilot bore.

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1. A butterfly valve assembly, comprising: a unitary flow body including an upper shaft bearing bore, a lower shaft bearing bore, a fluid inlet port, a fluid outlet port, and an inner surface defining a fluid passageway between the fluid inlet port and the fluid outlet port, the fluid passageway con

1. A butterfly valve assembly, comprising: a unitary flow body including an upper shaft bearing bore, a lower shaft bearing bore, a fluid inlet port, a fluid outlet port, and an inner surface defining a fluid passageway between the fluid inlet port and the fluid outlet port, the fluid passageway configured such that fluid flows therethrough in a flow direction;a loading slot formed in the lower shaft bearing bore;an upper shaft clearance formed in an inner surface of the upper shaft bearing bore;a lower shaft clearance formed in an inner surface of the lower shaft bearing bore; anda unitary valve element rotationally mounted within the flow body, the valve element including: a rotationally mounted shaft extending through the upper shaft bearing bore, the lower shaft bearing bore, and across the fluid passageway between the fluid inlet port and the fluid outlet port at a non-perpendicular angle relative to the flow direction, anda butterfly plate formed integral to, and extending from, the butterfly plate section of the shaft at a non-zero angle relative to the shaft, the butterfly plate rotatable with the shaft between a closed position, in which the butterfly plate is disposed perpendicular to the flow direction and thus the fluid inlet port and the fluid outlet port are at least substantially fluidly isolated from each other, and a full-open position, in which the fluid inlet port and the fluid outlet port are in fluid communication with each other,wherein the loading slot is dimensioned to allow the butterfly plate to be inserted through the lower shaft bearing bore and into the fluid passageway. 2. The valve assembly of claim 1, wherein the butterfly plate includes a first face and a second face, and wherein the valve assembly further comprises: a backing plate coupled to the butterfly plate;a seal ring disposed between the first face and the backing plate, the seal ring engaging extending radially from the butterfly plate and engaging the inner surface of the flow body; anda plurality of rivets extending through the backing plate and the butterfly plate to couple the backing plate to the butterfly plate. 3. The valve assembly of claim 1, wherein: the shaft includes an upper bearing section, a lower bearing section, and a butterfly plate section, the butterfly plate section between the upper bearing section and the lower bearing section;the upper bearing section and the lower bearing section each have a first diameter; andthe butterfly plate section has second diameter that is less than the first diameter. 4. The valve assembly of claim 3, further comprising: a first snap ring groove formed in the upper bearing section;a second snap ring groove formed in the upper bearing bore of the flow body;a first snap ring disposed within the first snap ring groove;a second snap ring disposed within the second snap ring groove;an upper bearing disposed within the upper shaft bearing bore between the first snap ring and the second snap ring and engaging the upper bearing section of the shaft; anda lower bearing disposed within the lower shaft bearing bore and engaging the lower bearing section of the shaft. 5. The valve assembly of claim 4, further comprising: a lower bearing cover coupled to the flow body and disposed at least partially within the lower shaft bearing bore, the lower bearing cover engaging at least a portion of the lower bearing;a manual lock opening formed in the lower bearing cover;a manual lock mechanism coupled to the shaft external of the flow body, the manual lock mechanism including a plurality of lock position openings extending therethrough, the manual lock mechanism rotatable with the shaft whereby each lock position opening may be selectively aligned with the manual lock opening;a lock pin stowage opening formed in the lower bearing cover; anda lock pin movably coupled to the flow body and configured to be selectively inserted into the lock pin stowage opening or through one of the lock position openings that is aligned with the manual lock opening. 6. A valve element adapted to be rotationally mounted within a flow body, the valve element comprising: a shaft including an upper bearing section, a lower bearing section, and a butterfly plate section between the upper bearing section and the lower bearing section, the upper bearing section and the lower bearing section each having a first diameter, the butterfly plate section having a second diameter that is less than the first diameter;a butterfly plate formed integral to, and extending from, the butterfly plate section of the shaft at a non-zero angle relative to the shaft, the butterfly plate including a first face and a second face;a backing plate coupled to the butterfly plate, the backing plate including an anti-rotation protrusion extending from a surface thereof;a seal ring disposed between the first face and the backing plate and including an anti-rotation notch, the anti-rotation notch engaging the anti-rotation protrusion and extending radially from the butterfly plate;a snap ring groove formed in the upper bearing section of the shaft; anda lower bearing engagement platform extending radially from the lower bearing section of the shaft. 7. The valve element of claim 6, further comprising: a plurality of rivets extending through the backing plate and the butterfly plate to couple the backing plate to the butterfly plate.