Patent ID: 8038874

Claim:
A dosing system comprising: a container for a treating liquid; a feed conduit having a first end in open communication with said container and a second end; a dosing chamber having an upper portion operatively connected to said second end of said feed conduit, said upper portion of said dosing chamber having a vent for breaking any air lock in said upper portion of said dosing chamber; a first valve operative to selectively control flow of treating liquid into said dosing chamber; a second valve operative to selectively control flow of treating liquid out of said dosing chamber; a selectively operable pressure source operatively connected to said first and second valves, said pressure source when actuated forcing said second valve to move toward a closed position and said first valve to open, continued application of pressure from said pressure source causing said second valve to close, while said first valve remains open and subsequent stoppage of pressure from said pressure source causing said second valve to open and said first valve to move toward a closed position.