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An improved joint connection between a rotary valve shaft and valve closure member for a fluid valve. A tapered key has a flat surface tapered at a small angle with respect to the opposite key surface. The rotary valve shaft includes a groove with a flat surface. The tapered key is wedged into a pas

An improved joint connection between a rotary valve shaft and valve closure member for a fluid valve. A tapered key has a flat surface tapered at a small angle with respect to the opposite key surface. The rotary valve shaft includes a groove with a flat surface. The tapered key is wedged into a passageway in the valve closure member to form an interference fit between the closure member, key and shaft.

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In a fluid valve, including a valve closure member and a shaft connected to the closure member and rotatable to rotate the closure member, an improved joint connection between the closure member and the shaft comprising: a boss formed on the valve closure member; said shaft including a groove having

In a fluid valve, including a valve closure member and a shaft connected to the closure member and rotatable to rotate the closure member, an improved joint connection between the closure member and the shaft comprising: a boss formed on the valve closure member; said shaft including a groove having a flat surface at one shaft end; a first passageway in the boss adapted to receive said one shaft end with the groove flat surface opposite an inside surface of the first passageway; a second passageway in the boss extending transversely to and communicating with the first passageway, with said shaft groove disposed in alignment with the second passageway; a key adapted for insertion into the second passageway and having a flat surface on one key side formed with a taper with respect to the opposite key side, said key flat surface engageably contacting said shaft groove flat surface; said key, shaft, and boss forming an interference fit in the joint connection; and wherein (1) at the midpoint of the key length, the key is formed with a semi-circular cross section, and (2) said groove in said one shaft end is formed with the distance between said groove flat surface and said opposite inside surface of the first passageway being substantially equal to the radius of said key semi-circular cross section to provide substantially equal surface contacts of the key, shaft and boss on each side of the shaft centerline.