Butterfly valve for limiting sudden variations in gas flow along

Details Butterfly valve for limiting sudden variations in gas flow along Butterfly valve for limiting sudden variations in gas flow along

1991-10-02

1992-12-29

Walton, George L.

Valves and valve actuation

Rotary valves

Butterfly

251120, F16K 122, F16K 4702

Patent

active

051745470

ABSTRACT:
A butterfly valve for limiting sudden variations in gas flow along a duct, the valve comprising a fixed coupling body between two duct ends or between one duct end and a volume, the body constituting a ring whose inside diameter is close to that of the duct, wherein the fixed body is fitted internally with a flap having a circular developed surface, the flap pivoting freely about a diametral shaft, the flap not being plane, but forming a dihedral angle along a ridge that constitutes a chord of the circular developed surface of the flap, the flap being free to rotate without friction relative to the fixed body, and wherein the flap is heavier on one side of the axis than on the other, with the position of the flap resulting from equilibrium between the force due to gravity and the force exerted on the flap by the action of any gas flow, with a flow of gas having the effect of causing the flap to pivot in such a direction as to throttle the duct.

REFERENCES:
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patent: 2200723 (1940-05-01), Reichhelm et al.
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patent: 3070345 (1962-12-01), Knecht
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patent: 3770242 (1973-11-01), O'Connor
patent: 4194722 (1980-03-01), Okerblom
patent: 4962783 (1990-10-01), Ball et al.
patent: 4967778 (1990-11-01), Ball et al.
patent: 5067506 (1991-11-01), Ball et al.

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