Valve disc and drive shaft assembly

Details Valve disc and drive shaft assembly Valve disc and drive shaft assembly

1993-01-05

1994-03-29

Fox, John C.

Valves and valve actuation

Valve actuator is inlet or outlet

Plural motions of valve

251308, F16K 122

Patent

active

052977781

ABSTRACT:
A butterfly valve disc has a circular cross-section bore for receiving the end of a drive shaft which engages with a member non-rotatably located in the bore. The member is polygonal and preferably formed with twelve sides and edges, the edges biting into the internal surface of the bore to prevent rotation. The member preferably is of harder alloy than the disc to resist wearing and is formed with a slot extending perpendicularly to the plane of the disc to receive a corresponding tongue formed at the end of the shaft. This arrangement allows a small degree of play so that if the disc is subjected to pressure on one side and therefore bends, the torque required to open the valve is not increased. Alternatively wherein the disc (or another component) is not subject to such pressure the member may be integrally formed with the shaft.

REFERENCES:
patent: 3601360 (1971-08-01), Scaramucci
patent: 3988000 (1976-10-01), Reese
patent: 4376333 (1983-03-01), Kanamaru et al.
patent: 4380246 (1983-04-01), Casale et al.
patent: 4574448 (1986-03-01), Brandenstein et al.
patent: 4786031 (1988-11-01), Waldrop

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