Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Patent
1979-09-24
1981-06-30
Cline, William R.
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
137 10, 137 88, G05D 1100
Patent
active
042757525
ABSTRACT:
Apparatus for combining fluid flows in variable proportions is adapted for blending an active constituent gas and a diluent gas to calibrate gas analyzers used in monitoring pollution.
Diluent gas passes from source 34 through a downstream differential pressure regulator 17 and a constant flow restrictor 12 to outlet 14 which communicates with control port 20 of regulator 17. Active gas passes from source 35 through differential pressure regulator 23, through three fixed parallel flow restrictors 22, 29 and 30 to combine with the diluent gas upstream of restrictor 12. Control port 26 of regulator 23 communicates with the input to restrictor 12. Switching of valves 31, 32 and 33 varies the rate of flow along conduit 16 and hence the proportions of gases combined upstream of restrictor 12. Regulator 23 maintains flow along 16 substantially constant for given valve settings, and regulator 17 maintains flow along outlet 14 substantially constant despite changes in flow rate in the conduit 16.
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Clements John H.
Collier Nigel A.
Cline William R.
Spiegel H. Jay
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