Automatic temperature and humidity regulation – Mixing fluid of dissimilar temperature – Mixing valve with temperature motive means
Patent
1993-05-10
1994-03-15
Wayner, William E.
Automatic temperature and humidity regulation
Mixing fluid of dissimilar temperature
Mixing valve with temperature motive means
137 3, 137605, G05D 2312
Patent
active
052940454
ABSTRACT:
A temperature and flow rate controller consisting of a first bank of three-port solenoid-actuated valves for temperature control in series with a second bank of two-port on/off solenoid valves for flow rate control. Each three-port valve has two input ports connected to a cold and a hot stream source, respectively, and an output port connected to a common discharge chamber wherein the throughput from all valves is mixed and reaches an average temperature. These valves are always open, either to the cold or the hot source, and the temperature of the combined discharge is set by the relative position of each valve in the bank; therefore, the total flow rate through the first bank of valves remains constant regardless of the valve settings required to yield the desired temperature. The output of the first bank of valves is regulated by the second bank of on/off valves, which is disposed in series therewith. Each of these valves is either open or closed, thus permitting the setting of the downstream pressure and, correspondingly, of the flow rate to a desired throughput by incremental adjustments achieved by digital control means. In another embodiment of the invention, the flow rate is regulated with a globe or equivalent valve actuated either manually or by a stepper motor.
REFERENCES:
patent: 3702619 (1972-11-01), Son
patent: 4170245 (1979-10-01), Haley
patent: 4635844 (1987-01-01), Barrett, Sr.
patent: 4757943 (1988-07-01), Sperling et al.
Durando Antonio R.
Wayner William E.
Weiss Harry M.
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