Butterfly valve

Details Butterfly valve Butterfly valve

1978-04-03

1980-07-29

Cline, William R.

Valves and valve actuation

Rotary valves

Butterfly

251308, F16K 1226

Patent

active

042147310

ABSTRACT:
An annular valve seat comprises an annular elastic seat member of large width formed in its outer periphery with a circumferential groove having an enlarged bottom and a trapezoidal cross section, and an annular metal core substantially conforming to the groove in cross section and fitting in the groove. The seat is fitted to the inner surface of the case of the valve defining a flow passage. When the valve is installed in a piping system with pipe flanges fitting to the valve case at the opposite ends of its flow passage, the opposed pipe flange surfaces hold the opposite side faces of the valve seat in pressing contact therewith to tightly fit the seat to the case. The disk of the valve has stem holding bores each provided with cutouts extending inward axially thereof and also circumferentially of the disk at the upper end of the bore to permit escape of air from the bore. A circumferentially elongated planar contact face is formed on the peripheral portion of the disk where each stem projects from the disk. A similar contact face is formed on the elastic seat member in opposed relation to the contact face on the disk. The disk is turnable from its closed position with decreasing friction between the contact faces.

REFERENCES:
patent: 1188462 (1916-06-01), McCormack
patent: 3306573 (1967-02-01), Trefil
patent: 3314641 (1967-04-01), Overbaugh
patent: 3341170 (1967-09-01), Housworth
patent: 3537683 (1970-11-01), Snell, Jr.
patent: 3782684 (1974-01-01), Stephens et al.
patent: 3784157 (1974-01-01), Wenglar
patent: 3790130 (1974-02-01), Getty, Jr.
patent: 3921956 (1975-11-01), Hinrichs
patent: 4025050 (1977-05-01), Manki et al.
patent: 4057217 (1977-11-01), MacDonald

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