Fluid flow control

Details Fluid flow control Fluid flow control

1980-01-25

1981-04-21

Yudkoff, Norman

Concentrating evaporators

Fluid feed or discharge devices

Automatic

159DIG10, 137110, 239 75, 239112, 52803k, B01D 100

Patent

active

042630916

ABSTRACT:
A plurality of spray nozzles are utilized to introduce a fluid into a vessel. Control valves are associated with each one of the plurality of spray nozzles. The control valves are either fully closed or fully open. The actual value of a process variable is compared to the desired value of the process variable to generate a difference signal. Control signals are generated in response to the difference signal. Different combinations of the control valves are opened in response to the control signals so as to provide a fluid flow rate which will maintain the actual value of the process variable substantially equal to the desired value. The on-off nature of the control valves provides a substantially maximum pressure drop across the spray nozzles when fluid is flowing through the spray nozzles.

REFERENCES:
patent: 3374211 (1968-03-01), Marwil et al.
patent: 3782632 (1974-01-01), Braun et al.
patent: 3806030 (1974-04-01), Svensson
patent: 3879984 (1975-04-01), Welland
patent: 4019653 (1977-04-01), Scherer et al.
patent: 4204612 (1980-05-01), Schrader et al.

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