Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1990-11-13
1992-07-14
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
1374875, G05D 706
Patent
active
051294184
ABSTRACT:
An improved mass flow controller can be connected to a passageway of a fluid, and can utilize a sensor unit for measuring a characteristic of the mass flow, and deriving a corresponding flow rate signal. Supplemental condition sensors can measure other parameters of the flow rate independent of their utilization in determining the actual flow rate, and can monitor and compare the current value of these sensor conditions, with standards to thereby monitor the operational performance of the mass flow controller.
REFERENCES:
patent: 4146051 (1979-03-01), Sparks
patent: 4394871 (1983-07-01), Czajka
patent: 4487213 (1984-12-01), Gates
Shimomura Mitsuzo
Yamaguchi Masao
Cohan Alan
Stec Inc.
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