Valves and valve actuation – Rotary valves – Seat or interface seal
Patent
1975-07-08
1976-11-16
Cline, William R.
Valves and valve actuation
Rotary valves
Seat or interface seal
251DIG1, 251309, 251312, 251357, F16K 504
Patent
active
039919757
ABSTRACT:
A rotary plug valve having a plug member rotatable in a valve housing member between an open position and a closed position, the plug member carrying a sealing ring, such as an O-ring seal or the like, in a groove provided on its surface between its port openings, the O-ring seal being adapted to encircle one of the ports of the housing member when the plug member is in the closed position. The rotary plug valve is capable of two-way flow therethrough, and this is realized by providing means for equalizing the pressure across the unsupported portion or segment of the O-ring seal when the same is passing across one of the ports of the valve housing. By such an arrangement, the pressure across the O-ring seal may be equalized in certain situations such as when the plug member is rotated towards and approaches a position for closing the valve and when the plug member is rotated towards and approaches the full open position and this prevents clipping or shearing of the O-ring seal. This particular arrangement of pressure equalizing means for the O-ring seal of the rotary plug valve makes the valve capable of two-way flow in that it may be inserted into a fluid pressure line so that the O-ring seal surrounds the upstream port of the housing member when in closed position, or the downstream port of the housing member when in closed position.
REFERENCES:
patent: 2433732 (1947-12-01), Brown
patent: 2493966 (1950-01-01), Hartley
patent: 2497448 (1950-02-01), Grosboll
patent: 2510514 (1950-06-01), Mueller
patent: 2547116 (1951-04-01), Gould
patent: 2547831 (1951-04-01), Mueller
patent: 2604293 (1952-07-01), Phillips
patent: 2850041 (1958-09-01), Radanof
patent: 3480042 (1969-11-01), Mueller et al.
patent: 3484078 (1969-12-01), Haenky
patent: 3883113 (1975-05-01), Kolb
Cline William R.
Mueller Co.
Spiegel H. Jay
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