Butterfly valve with biased area reduction means

Details Butterfly valve with biased area reduction means Butterfly valve with biased area reduction means

1991-10-16

1992-05-19

Nilson, Robert G.

Fluid handling

Systems

Sequentially progressive opening or closing of plural valves

1375992, 251283, 251305, F16K 122

Patent

active

051139103

ABSTRACT:
A butterfly valve adapted for controlled variation in the area of the leading wing of the valve plate. The valve plate is comprised of two parallel plate-like members which are relatively translatable in mutually parallel directions. The relative translational movement further covers or uncovers an open area formed through one of the two members on the leading wing thereof. Movement of the valve plate occurs as either rotational movement of the entire valve plate or relative translational movement between the foresaid members. The type of movement depends on whether the force exerted on the members by a biasing mechanism is exceeded by the torque exerted on the valve plate by a conveyed fluid.

REFERENCES:
patent: 2796082 (1957-06-01), Green et al.
patent: 3147768 (1964-09-01), Kennedy
patent: 3971414 (1976-07-01), Illing
patent: 4962783 (1990-10-01), Ball et al.
patent: 4964431 (1990-10-01), Ball et al.
patent: 4969485 (1990-11-01), Ball et al.
patent: 4995414 (1991-02-01), Tervo

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