Abstract: A valve in a fluid treatment system adapted for controlling the flow of fluid between a source and a treatment media disposed in a treatment chamber. The valve includes a housing having a fluid passageway between an inlet and an outlet; a containment chamber; and a sealing member reciprocal between a first position in which the sealing member is retained in the containment chamber out of the flow of fluid in the passageway and a second position that seals the outlet. The containment chamber also includes a drain opening, which can be a venturi, for emptying the containment chamber of fluid.

Abstract: A valve for use in a fluid treatment system for control the flow of fluid between a source and a treatment media disposed in a treatment chamber has a housing having an inlet, and outlet and a passageway in fluid communication between the inlet and outlet. The tank also has a sealing member configured to reciprocate in the housing between a first position and a second position. The housing also has a containment chamber for retaining the sealing member in the first position out of the flow of fluid in the passageway.