US 12,291,811 B2
Pressure compensated Venturi dispensing system
Terry Tincher, Lebanon, OH (US); and Christopher J. Dyer, South Warnborough (GB)
Assigned to Delaware Capital Formation, Inc., Wilmington, DE (US)
Filed by Delaware Capital Formation, Inc., Wilmington, DE (US)
Filed on Dec. 22, 2023, as Appl. No. 18/394,014.
Application 18/394,014 is a continuation of application No. 17/086,505, filed on Nov. 2, 2020, granted, now 11,891,741.
Application 17/086,505 is a continuation of application No. 16/026,746, filed on Jul. 3, 2018, granted, now 10,877,491, issued on Dec. 29, 2020.
Claims priority of provisional application 62/558,499, filed on Sep. 14, 2017.
Prior Publication US 2024/0200255 A1, Jun. 20, 2024
Int. Cl. D06F 33/37 (2020.01); B01F 25/312 (2022.01); B01F 35/21 (2022.01); G05D 7/06 (2006.01); G05D 11/00 (2006.01); G05D 11/08 (2006.01); G05D 11/13 (2006.01); G05D 21/02 (2006.01); D06F 103/22 (2020.01); D06F 105/42 (2020.01); G01N 21/41 (2006.01)
CPC D06F 33/37 (2020.02) [B01F 25/31232 (2022.01); B01F 25/31243 (2022.01); B01F 35/2113 (2022.01); G05D 7/0617 (2013.01); G05D 11/00 (2013.01); G05D 11/08 (2013.01); G05D 11/138 (2013.01); G05D 21/02 (2013.01); D06F 2103/22 (2020.02); D06F 2105/42 (2020.02); G01N 21/4133 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method of operating a chemical dispensing system using eductors, the method comprising:
obtaining, from a pressure sensor positioned at a fluid inlet of the chemical dispensing system, a first signal indicative of a pressure of a diluent;
determining, based at least in part on the pressure of the diluent and a desired dose of a chemical, a dispense duration that represents a duration of time to maintain a selector valve of the chemical dispensing system open in order to draw the desired dose of the chemical through an eductor at the pressure of the diluent;
controlling operation of the selector valve to cause the selector valve to open, thereby, causing the diluent to flow through the eductor, wherein the eductor includes an inlet port into which the diluent flows, a pickup port configured to draw the chemical into the eductor in response to the diluent flowing through the eductor, a discharge port, and a venturi fluidically coupled to the inlet port, the discharge port, and the pickup port; and
controlling operation of the selector valve to cause the selector valve to close after the selector valve has been opened for the dispense duration.