Valves and valve actuation – Rotary valves – Butterfly
Patent
1988-11-07
1990-07-31
Fox, John C.
Valves and valve actuation
Rotary valves
Butterfly
251305, F16K 506
Patent
active
049444905
ABSTRACT:
The present invention is a shaftless butterfly valve that does not require a valve housing and may be mounted to a length of pipe by merely drilling a hole into the wall of the pipe. A stuffing box is attached to a pipe by a U-bolt or other conventional means. The stuffing box serves as a drill jig to center the hole that must be drilled in the pipe. A threaded rotatable stem is arranged to penetrate one side of a pipe perpendicularly to the axis thereof. In the interior of the pipe, the stem is threaded into a stem nut which travels along the length of the stem as the stem rotates. Its travel is limited by a stop pin which is located at the extremity of the stem in the interior of the pipe. An elliptical disc is attached to the stem nut by a hinge pin. The valve is closed and opened by rotating the stem nut along the threaded rotatable stem, which in turn forces the disc to pivot about the stem nut and also about the center of the pipe.
REFERENCES:
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patent: 3539150 (1970-11-01), Conrad
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patent: 3727879 (1973-04-01), Lange et al.
patent: 3771759 (1973-11-01), Pabquette
patent: 4520995 (1985-06-01), Lew
Barnard Ralph R.
Fox John C.
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