Fluid handling – Self-proportioning or correlating systems – Mixture condition maintaining or sensing
Patent
1984-11-01
1986-07-29
Cohan, Alan
Fluid handling
Self-proportioning or correlating systems
Mixture condition maintaining or sensing
12820422, 12820511, G05D 1102
Patent
active
046026533
ABSTRACT:
A gas blending system includes a proportional mixing valve having a valve element movable between first and second limits of travel corresponding to a minimum and maximum percentage, respectively, of one of the gases in the blended mixture. The position of the valve element is detected by a detection mechanism, producing a position signal inputted to a microcomputer. The microcomputer also receives a control signal representing a desired percentage of one of the gases to be blended. The microcomputer calculates a desired valving element position as a function of the value of the control signal, and generates a drive signal as a function of a comparison made by the microcomputer between the detected valve element position and the desired position. A motor drives the valve element to the desired position in response to the drive signal. The system also includes an accumulator for accumulating a selected volume of gas mixture flowing from the outlet of the valve prior to delivery of the mixture to a downstream demand. The accumulator increases the effective peak flow rate capacity of the system, while "smoothing out" instantaneous changes in downstream flow rate demand before the effects of such changes are experienced at the valve.
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Brooks Maurice J.
DeVries Douglas F.
Ruiz-Vela Alberto
Bear Medical Systems, Inc.
Cohan Alan
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