Flow control valve with internal rate of flow feedback

Details Flow control valve with internal rate of flow feedback Flow control valve with internal rate of flow feedback

1975-03-17

1976-03-16

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

With counter-balancing pressure feedback to the modulating...

13762564, 13762563, F15B 13044

Patent

active

039439577

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.

REFERENCES:
patent: 3874269 (1975-04-01), Walters
patent: 3899002 (1975-08-01), Hayner

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