Warm-up/changeover valve or proximity switch

Details Warm-up/changeover valve or proximity switch Warm-up/changeover valve or proximity switch

1987-11-27

1989-07-04

Davis, Jr., Albert W.

Heat exchange

Movable heating or cooling surface

Rotary drum

165 24, 236 1C, 236 493, 236 48A, 236 86, 251 65, F24F 300, F24F 1104

Patent

active

048441490

ABSTRACT:
A valve is provided with one inlet and two outlets with one of the outlets being normally closed by a valve in the form of a film disc carried by a flexible blade. A magnetic pad secured to the blade is attracted by the proximity of an actuator carrier magnetic element to cause the flexing of the blade to open the normally closed outlet and to close the normally open outlet. The actuator may be either thermally or electrically actuated and is suitable for use in a VAV system with thermostatically controlled bellows to override a bleed thermostat to permit warm-up of an overcooled area or to cause a switch over in operation between a heating and cooling mode by connecting the appropriate bleed thermostat so as to control the inflation of the bellows.

REFERENCES:
patent: 1729060 (1929-09-01), Breese, Jr.
patent: 2575086 (1951-11-01), Atchison
patent: 2781979 (1957-02-01), Kraft
patent: 4073433 (1978-02-01), Modes
patent: 4298164 (1981-11-01), Post
Abell, W. A. and Shakib, I. D., "Magnetically Actuated Pneumatic Valve", IBM Technical Disclosure, vol. 12, No. 12, May 1970, p. 2302.
Carrier, Installation and Start--Up Instructions 37P, Moduline Weathermaster Air Terminals, 1973, Form 37P-5SI.

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