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Liquid delivery systems

  • US 5,590,686 A
  • Filed: 05/02/1995
  • Issued: 01/07/1997
  • Est. Priority Date: 05/02/1995
  • Status: Expired due to Fees
First Claim
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1. A liquid delivery system comprising:

  • a pump including a liquid inlet and a liquid outlet;

    a plurality of valves, each valve located with respect to one of a plurality of containers adapted to hold liquid chemical, each of said valves adapted to control the flow of liquid chemical out of one of the containers;

    a diluent valve located with respect to a diluent reservoir including a diluent outlet to control the flow of diluent out of the diluent reservoir through the diluent outlet;

    a first liquid conduit assembly adapted to provide fluid communication between said diluent valve and said plurality of valves;

    a second liquid conduit assembly adapted to provide fluid communication between said plurality of valves and said pump;

    a total flow meter located and adapted to measure the volume flow of liquid being passed from said second liquid conduit assembly into said pump through said liquid inlet; and

    a control assembly adapted to control said pump, said plurality of valves and said diluent valve, and for monitoring the volume flow of liquid measured by said total flow meter, said control assembly being adapted to close said diluent valve prior to opening any of said plurality of valves to allow liquid chemical to pass into said second liquid conduit assembly, to open one of said valves to allow liquid chemical from one of the containers to pass from one of the containers into said second liquid conduit assembly, and to thereafter close said one of said valves to prevent liquid chemical from one of the containers from passing into said second liquid conduit assembly, said one of said valves being closed to prevent liquid chemical from passing from one of the containers into said second liquid conduit assembly based on the volume flow of liquid monitored by said total flow meter during the time said one of said valves is open to allow liquid chemical to pass from one of the containers into said second liquid conduit assembly.

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