Liquid flow controller

Details Liquid flow controller Liquid flow controller

1992-06-30

1994-04-19

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Thermal responsive

137486, 1374875, G05D 706

Patent

active

053037316

ABSTRACT:
A liquid flow controller for metering a flow of liquid has an inlet to receive the liquid. The inlet feeds the liquid to a high resistance liquid flow path across which a pressure drop arises. A pressure sensor measures the liquid flow induced pressure drop and generates pressure drop signal which is fed to an electronic circuit. A temperature sensor is connected to the high resistance liquid flow path and generates a temperature signal which is also fed to the electronic circuit. The circuit energizes a viscosity-normalized liquid flow signal, which is compared to a set point signal to generate an error signal. A valve connected downstream of the high resistance liquid flow path to control the flow of liquid is driven by the error signal and thereby controls the flow of liquid.

REFERENCES:
patent: 2658522 (1953-11-01), Coberly
patent: 2662547 (1953-12-01), Comeau
patent: 2675020 (1954-04-01), Breitwieser
patent: 4947889 (1990-08-01), Ishikawa et al.
patent: 5062446 (1991-11-01), Anderson

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