Reset controller with improved input mechanism

Details Reset controller with improved input mechanism Reset controller with improved input mechanism

1981-12-16

1983-07-26

Tapolcai, William E.

Fluid handling

Pressure modulating relays or followers

137486, 236 49, G05D 1606

Patent

active

043948693

ABSTRACT:
A controller for a damper maintains a substantially constant volumetric rate of flow of air through a duct into a controlled space for a given condition in the space and resets the rate of flow to three different levels as a function of three different conditions in the space. Two pneumatic actuators respond to the four conditions in the space and produce forces which vary with the conditions. A floating lever receives the forces and causes the controller to set the air flow as a function of the sum of the weighted values of the forces produced by the two actuators.

REFERENCES:
patent: 3020490 (1962-02-01), Kleiss
patent: 3126904 (1964-03-01), Ciarcariello
patent: 3174298 (1965-03-01), Kleiss
patent: 3395726 (1968-08-01), Cross et al.
patent: 3994434 (1976-11-01), Boyer et al.
patent: 4264035 (1981-04-01), Maxson et al.
patent: 4284237 (1981-08-01), Harris et al.

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