Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1976-10-26
1978-09-12
Cline, William R.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251317, 251192, 251172, 251283, 251161, 251309, 251174, F16K 500, F16K 518, F16K 2500
Patent
active
041132289
ABSTRACT:
A rotary plug valve comprised of a valve body having a replaceable liner and valve plug disposed therein. The liner is formed of a pair of axially split complementary liner members, including an upstream liner member and a downstream liner member, having at least one radially elastically deformable retaining member disposed around the periphery thereof. The dimensions of the valve plug, the liner members forming the liner and the elastically deformable retaining member are such that at pressures in the lower part of the working range of the valve, the retaining member is held in an elastically deformed condition, and the valve plug and liner are maintained in forceful intimate contact independent of pressure-related deformations in the valve body, and such that at relatively higher pressures above some predetermined intermediate pressure, the retaining member is further elastically radially expanded by the forces from the development of line pressure between the upstream liner member and the valve plug, and the seal between the upstream liner member and the valve plug is broken due to the high pressure fluid being forced therebetween, so that the force tending to move the upstream liner member against the valve plug is reduced, and less torque is required to open the valve.
REFERENCES:
patent: 2813695 (1957-11-01), Stogner
patent: 3061267 (1962-10-01), Hamer
patent: 3066909 (1962-12-01), Reed, Jr.
patent: 3133722 (1964-05-01), McGuire
patent: 3178152 (1965-04-01), Bishop
patent: 3194534 (1965-07-01), Sachnik
patent: 3423067 (1969-01-01), Foster
patent: 3425661 (1969-02-01), Mayo
patent: 3430919 (1969-03-01), Frazier
Cline William R.
Laney William R.
Spiegel H. Jay
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