Butterfly valve for hot fluid

Details Butterfly valve for hot fluid Butterfly valve for hot fluid

1995-12-26

1999-03-23

Fox, John

Valves and valve actuation

Rotary valves

Butterfly

251306, F16K 122

Patent

active

058848983

ABSTRACT:
A butterfly valve for hot fluid, including: a cylindrical duct; a flap pivotally mounted inside said duct; a shaft attached to said flap so that a rotational torque can be transmitted to the flap; a pin inserted into a peripheral portion of said flap so that the pin is rotatable; and a housing in which the duct, the flap, the shaft, and the pin are installed; wherein the flap is loaded from one end of the shaft via a spring in the axial direction of the shaft, the load is supported by the housing via the pin in the peripheral portion of the flap, and neither of a peripheral portion of a flap where a shaft is attached nor a peripheral portion a flap where a pin is inserted contacts said duct when the valve is fully opened. In the butterfly valve a driving force for opening and shutting does not change, and the butterfly valve smoothly opens and shuts even in use for a long period of time in a hot gas flow even in the case that the use of the valve at a high temperature causes an adhesion of oxidized scales or an increase of a coefficient of friction between members.

REFERENCES:
patent: 3921955 (1975-11-01), Haddad, Jr.
patent: 4465260 (1984-08-01), Conley et al.
patent: 5370361 (1994-12-01), Mendell et al.
Katsuhiko Tsuchiya et al., 372 Automotive Engineering, vol. 88, No. 9 (1980), pp. 82-86.

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