Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Patent
1980-02-04
1982-03-23
Cline, William R.
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
137 98, 13710119, 13710125, 137256, 73309, 222 28, G05D 1102
Patent
active
043207758
ABSTRACT:
A process and apparatus are disclosed for the accurate measurement and control of liquid flow at low flow rates. The invention is particularly applicable to the measurement and control of continuous liquid blending operations, e.g. gasoline blending, in which a liquid additive, e.g. tetraethyl lead, is fed into a continuously flowing liquid stream, the additive being added in precisely controlled amounts requiring precise control of liquid flow at very low flow rates. According to the invention the additive is fed from a stock tank 1 alternately into one or the other of two reservoirs 6, 7 connected in parallel between the inlet line 3 from the stock tank and an outlet line 20. As the one reservoir is being charged, the other is being discharged through the four-way valve 5 to the outlet. Flow through the outlet line 20 is controlled by a valve 22. In accordance with the invention, the mass of liquid is continuously monitored by means in each reservoir sensitive to the weight of liquid in the reservoir which emits a signal proportional to the mass of liquid in the reservoir. This signal is passed to a differentiator for conversion into a flow signal proportional to the mass flow rate. The flow rate signal is fed to a ratio controller 36 for comparison with a demand signal fed via line 39 representing the desired flow rate. Depending on the difference, if any, between the flow signal and the demand signal, a control signal is sent via line 35 to automatically adjust the setting of the valve 22 and bring the flow rate to the desired value.
REFERENCES:
patent: 2460503 (1949-02-01), Howe
patent: 3353711 (1967-11-01), Biezunski et al.
patent: 3690392 (1972-09-01), Smith
patent: 4244211 (1981-01-01), Carpino
patent: 4244218 (1981-01-01), Wohrl
Peres Robert L.
Stirling William
Cline William R.
Octel S.A.
The Associated Octel Company Limited
LandOfFree
Liquid metering unit responsive to the weight of the metered liq does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liquid metering unit responsive to the weight of the metered liq, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid metering unit responsive to the weight of the metered liq will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1647470