Shaft bearing and seals for butterfly valves

Details Shaft bearing and seals for butterfly valves Shaft bearing and seals for butterfly valves

1975-09-29

1977-05-10

Schwadron, Martin P.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

251305, 277 30, 277 53, 308 361, 308 72, F16K 3144

Patent

active

040224244

ABSTRACT:
A butterfly valve comprises a valve disc mounted on and rotatable with a shaft disposed across the inner diameter of a cylindrical valve casing, said shaft being rotatably supported at each end by a bearing within the valve casing. Fluid flow through the valve casing is controlled by rotating the valve disc from a fully open position through a fully closed position. A shaft seal and bearing is disclosed which prevents leakage of the controlled fluid out of the valve casing axially along the valve disc shaft even under conditions of shaft flexure. Moreover, the shaft seals adjust to the shaft flexure to obviate binding between the shaft and shaft seals.

REFERENCES:
patent: 2709629 (1955-05-01), Ledinegg
patent: 2860895 (1958-11-01), Mosbacher
patent: 2990220 (1961-06-01), Malone
patent: 3591188 (1971-07-01), Eisner
patent: 3604206 (1971-09-01), Baily
patent: 3642024 (1972-02-01), La Coste et al.
patent: 3871223 (1975-03-01), Kralowetz

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