Valves and valve actuation – Rotary valves – Butterfly
Reexamination Certificate
2006-08-15
2006-08-15
Yu, Justine R. (Department: 3751)
Valves and valve actuation
Rotary valves
Butterfly
C251S359000
Reexamination Certificate
active
07090193
ABSTRACT:
A portion of the one valve rod which extends outward is pivotally supported, the valve shaft cylindrical portion which is connected to the valve rod shaft supporting portion is made of material different from that of the valve body, a slanting surface is formed between the inner peripheral surface and the outer peripheral surface of the sheet ring, an angle and a width formed by the slanting surface and the outer peripheral side surface are the greatest at a position intersecting with the valve shaft at right angles and are the smallest at a position of the valve shaft, a central portion of an inner peripheral surface of the valve body is allowed to project inward to form an engaging projection, the sheet ring is brought into contact with the inner peripheral surface of the valve body under pressure in the opposite sides of the recess groove, the cylindrical bush whose one end is closed is mounted to the other valve rod which pivotally supports the valve element, and the other valve rod is sealed.
REFERENCES:
patent: 3143132 (1964-08-01), Pangburn
patent: 3346005 (1967-10-01), Hanssen
patent: 3425439 (1969-02-01), Duffey et al.
patent: 4006882 (1977-02-01), Bonafous
patent: 4014511 (1977-03-01), Uno
patent: 4148458 (1979-04-01), Holtgraver
patent: 4289297 (1981-09-01), Nakanishi
patent: 4318422 (1982-03-01), Nakanishi et al.
patent: 4659064 (1987-04-01), Scobie et al.
patent: 5839717 (1998-11-01), Feigel
patent: 3026251 (2000-01-01), None
patent: 3090420 (2000-07-01), None
patent: 3188680 (2001-05-01), None
patent: 2002-181203 (2002-06-01), None
Rost Andrew J.
Snider Ronald R.
Snider & Associates
Tomoe Technical Research Company Ltd.
Yu Justine R.
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