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Chemical supply tube isolation system

  • US 6,336,468 B1
  • Filed: 01/30/1998
  • Issued: 01/08/2002
  • Est. Priority Date: 01/30/1998
  • Status: Expired due to Fees
First Claim
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1. An isolation system for isolating a supply container from a supply tube connecting said supply container to a manifold of an associated chemical delivery system, said isolation system comprising:

  • a feedback tube having a first end connected to said manifold and a second end connected to said supply tube at a junction thereof;

    a valve arrangement proximate to said junction for selectively connecting a first portion of said supply tube to either a second portion of said supply tube or to said feedback tube, said first portion of said supply tube connected between said valve arrangement and said manifold, said second portion of said supply tube connected between said valve arrangement and said supply container; and

    a pump located in-line along said first portion of said supply tube, between said valve arrangement and said manifold, for pumping in forward and reverse directions, where said valve arrangement is configured to be responsive to the pumping direction of the pump, such that in use said valve arrangement is either automatically adjusted when said pump is pumping in the forward direction to selectively connect said first portion of said supply tube to said second portion of said supply tube so as to supply a chemical fluid from the supply container to the pump to be delivered to the manifold, or automatically adjusted when said pump is pumping in the reverse direction to selectively connect said first portion of said supply tube with said feedback tube to draw water from the manifold through the pump to flush said chemical fluid therefrom into the manifold and out of said isolation system.

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