Fluid handling – Processes – Involving pressure control
Patent
1977-01-31
1977-09-06
Cohan, Alan
Fluid handling
Processes
Involving pressure control
1374875, 137487, 137110, 73205D, 23515134, 137601, G01G 100
Patent
active
RE0293830
ABSTRACT:
A plurality of individually actuatable, value weighted digital bistable valve elements in parallel interconnect a fluid source to a fluid receiver. A linear relationship is preferably maintained between the resultant fluid flow rate from the source to the receiver and the product of a flow rate determinative fluid parameter times the sum of the weighted values of the digital valve elements in the open state. The fluid parameter is sensed, the states of the digital valve elements are controlled, and a flow rate representative signal is derived from the states of the valve elements and the fluid parameter. If the fluid is liquid, the parameter is the square root of the pressure difference across the valve elements, in the absence of cavitating venturis, and is the square root of the difference between the upstream pressure and the vapor pressure of the liquid in the presence of cavitating venturis. If the fluid is gas, the parameter is the source pressure divided by the square root of the source temperature. For measurement, the states of the digital valve elements are controlled to maintain the value of the fluid parameter constant. For control the states of the digital valve elements are controlled to establish a set point flow rate.
REFERENCES:
patent: 2627280 (1953-02-01), Adelson
patent: 3776249 (1973-12-01), Wailes et al.
Digital Control Valves by Friedland et al., pp. 251-264, ISA Transactions, vol. 8, No. 4, 1969.
Brochure, "Self Optimizing Digital Flow Meter Calibration System," Process Systems, Inc., 356 W. Seventh South, Salt Lake City, Utah.
Gallatin Robert A.
Langill, Jr. Addison W.
Cohan Alan
Process Systems Inc.
LandOfFree
Digital fluid flow rate measurement or control system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital fluid flow rate measurement or control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital fluid flow rate measurement or control system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2155946