Butterfly valve with plural-fence modulator plate

Details Butterfly valve with plural-fence modulator plate Butterfly valve with plural-fence modulator plate

1991-04-12

1992-04-07

Nilson, Robert G.

Valves and valve actuation

Balanced valves

Rotary

251305, F16K 122

Patent

active

051020971

ABSTRACT:
A flow modulator (48) for a butterfly valve (40) incorporates a first protrusion (64) on the high-pressure side (52) of the modulator and a second protrusion (66) on the low-pressure side (54). The second protrusion (66) is spaced from the leading edge (60) to define a surface portion (88) of the low-pressure side (54). In operation, the second protrusion (66) functions as a flow restrictor that increases pressure in a region (86) of the flow path (44) bordered in part by the second protrusion and the surface portion (88). This increase in pressure serves to minimize the net aerodynamically-induced closing torque exerted on the modulator (46). The height of the second protrusion and its distance from the leading edge are shown to be important design parameters. In addition, the use of a third protrusion (114) for reducing torque drop-off at high rotational angles is disclosed.

REFERENCES:
patent: 2095263 (1937-10-01), Moss
patent: 2271390 (1942-01-01), Dodson
patent: 3442489 (1969-05-01), Cary et al.
patent: 3516640 (1970-06-01), Bryer et al.
patent: 3960177 (1976-06-01), Baumann

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