Valves and valve actuation – Rotary valves – Butterfly
Patent
1996-12-18
2000-10-17
Fox, John
Valves and valve actuation
Rotary valves
Butterfly
251305, F16K 1226
Patent
active
061318825
ABSTRACT:
A butterfly valve comprising a cylindrical valve body (1), a sheet ring (5) fitted into the inner periphery of the valve body (1), and a discoid valve discoid valve disk (3) for opening or closing the valve. When the valve is opened by rotating the valve disk (3), a gap forms at the half of the valve disk (3) that is rotated downstream between the sheet ring (5) and the sealing surface (3c) of the valve disk (3). The gap between the sheet ring (5) and the sealing surface (3c) of the valve disk (3) expands and a second gap is formed at the half of the valve disk (3) that is rotated upstream between the sheet ring (5) and the sealing surface (3c) as the valve disk (3) further opens. The sheet ring (5) is not influenced by turbulent flow produced due to a narrowed channel (4) because the sheet ring (5) is positioned to the upstream side of a position where the channel (4) is most narrowed when a valve opening rate is approximately 15% in which the load applied to the sheet ring (5) due to fluid is maximized. Thereby, a butterfly valve can be obtained which has characteristic capable of precisely controlling a flow rate of 10% or less of the total flow rate.
REFERENCES:
patent: 2095263 (1937-10-01), Moss
patent: 2662545 (1953-12-01), Kelley
patent: 3176704 (1965-04-01), De Palma
patent: 3960177 (1976-06-01), Baumann
patent: 4281817 (1981-08-01), Adams et al.
patent: 4296915 (1981-10-01), Baumann
patent: 4712768 (1987-12-01), Herr et al.
patent: 4796857 (1989-01-01), Hayes et al.
patent: 5102097 (1992-04-01), Davis et al.
Fox John
Miyairi Kazuhiro
NBS Co., Ltd.
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