Title: Flow control valve with internal rate of flow feedback

Abstract: A two-stage fluid flow control valve system employing feedback such that the rate of flow of fluid through the load connections follows an input signal very closely over a wide dynamic range. The system employs poppet valves as flow sensors in the return line. The rate of flow of fluid through these sensors is a non-linear function of the pressure thereacross such that the change in pressure drop resulting from a given displacement from a set flow rate is greater at low ranges of flow than at high ranges. The result is closer control at low rates of flow where such control is normally more difficult to achieve.

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Inventors: Hayner, Paul F. (Gilford, NH, US)

Application Number: 558754
Filing Date: 1975-03-17
Publication_date: 1976-03-16
Assignee: Sanders Associates, Inc. (Nashua, NH)
Primary Class(es): 137/85 137/625.63, 137/625.64
Other Classes:
US Patent Ref:

3874269	Apr, 1975	Walters	137/625.
3899002	Aug, 1975	Hayner	137/625.

Other Refs:
Primary Examiner: Cohan, Alan
Assistant Examiner:
Attorney: Etlinger; Louis, Hunter; William L.