Valves and valve actuation – Rotary valves – Butterfly
Patent
1978-10-19
1980-09-30
Cline, William R.
Valves and valve actuation
Rotary valves
Butterfly
29525, F16K 122
Patent
active
042251141
ABSTRACT:
A butterfly valve is provided having a disc with a hub. The disc is adapted to be rotated between an open and a closed position. A valve seat is adapted to engage the disc in the closed position. A shaft has one end affixed to the hub and extends outwardly therefrom to permit torque to be transmitted to the disc from a point external thereof. The end of the shaft affixed to the hub includes a plurality of splines for securing the shaft to the hub. Each of the splines interfers with the hub by a maximum dimension of 0.030 inches. The hub has a stress that is less than 20,000 pounds per square inch. The shaft is joined to the disc by forming the valve disc with a portion of increased thickness (hub) relative to the main portion of the disc. The portion of increased thickness is formed adjacent the circumference of the disc. A hole is then machined into the portion of increased thickness parallel to the disc, with the hole having a diameter slightly smaller than the diameter of the shaft. Splines are formed on one end of the shaft and the shaft is then pressed into the hole, cutting grooves in the side walls of the hole, thereby forming a permanent connection between the shaft and the disc.
REFERENCES:
patent: 1157666 (1915-10-01), Bennett
patent: 1779805 (1930-10-01), Dunwoodie
patent: 2015430 (1935-09-01), Matthews et al.
patent: 2343143 (1944-02-01), Gill
patent: 2529572 (1950-11-01), Raybould
patent: 3074292 (1963-01-01), Polmon
patent: 3174212 (1965-03-01), Seltsam
patent: 3210892 (1965-10-01), Perham
patent: 3260502 (1966-07-01), Plumer
patent: 3345033 (1967-10-01), Fawkes
patent: 4176823 (1979-12-01), Gliatas
Barthelemy Paul J.
Clausing Dale R.
Libke Albert W.
Trott Donald R.
Cline William R.
General Signal Corporation
Mednick Jeffrey S.
Spiegel H. Jay
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