Water treatment system

摘要

A water treatment system including a pair of water treatment tanks, each tank defining a flow path extending from a tank inlet to a tank outlet and containing a water treatment material disposed along the flow path for treating water as it travels from the inlet to the outlet. A system controller controls which of the tanks is on-line and which of the tanks is off-line and controls the regeneration of an exhausted tank. A multi-stage, spring-loaded control valve assembly controls the communication of fluid to a regeneration control turbine and includes a piston head and a relatively movable seat-carrying stem. A spring urges the stem away from the piston head such that initial movement of the head compresses the spring but does not produce movement in the seat. Sufficient movement of the piston head produces movement in the seat, thereby causing the seat to open pressure.

主权项

1. A water treatment apparatus, comprising:
a) a pair of water treatment tanks each defining a fluid flow path including a compartment containing water treatment media through which water to be treated is passed; b) control means for controlling which of said tanks is on-line and which of said tanks is off-line; c) an inlet valve associated with each tank, said inlet valve movable between open and closed positions by a fluid pressure operated inlet valve operating member responsive to at least a first pressurized fluid signal applied to said operating member by said control means; d) an outlet valve associated with each tank, said outlet valve movable between open and closed positions by a fluid pressure operated outlet valve operating member responsive to at least a second pressurized fluid outlet signal applied to said operating member by said control means; e) monitoring means for determining when an on-line tank requires regeneration; and f) regeneration control system, including a regeneration turbine and a fluid pressure operated control valve assembly for controlling the communication of fluid for driving said turbine, said control valve assembly including:
i) a fluid pressure operated piston head for receiving fluid generated opening forces from a fluid pressure signal linesaid piston head moving in an opening direction only in response to a fluid pressure signal in said fluid pressure signal line, said control valve assembly being only fluid pressure operated and not operable by an externally applied non-fluid pressure force;ii) a stem coupled to said head and relatively movable with respect to said head for a predetermined distance;iii) a spring urging said stem away from said piston head; andiv) a valve seat carried by said stem; g) said piston head, stem, spring and seat configured such that, upon receiving said fluid pressure generated opening forces, said piston head initially moves towards said seat, compressing said spring until said seat disengages an associated seating surface, whereupon said spring expands to further move said seat away from said associated seating surface while said piston head is receiving said fluid pressure generated opening forces.