Control valve assembly

Abstract

A control valve assembly ( 10 ) controls the flow of water to and from a treatment tank ( 16 ) and the regeneration of the treatment material therein. A housing of the valve assembly includes connections for a tank inlet and tank outlet, an inlet chamber ( 60 ), outlet chamber ( 34 ), a pressure-operated inlet valve ( 24 ) and an outlet valve ( 32 ). A pair of venturi chambers ( 81 a, 81 b ) are configured to provide co-current and counter-current regeneration. A subsystem includes a turbine ( 104 ) and a nozzle. An external port ( 130 ) receives fluid to to drive the turbine in order to initiate regeneration. The inlet valve ( 24 ) has dual seating surfaces for controlling the communication between the inlet chamber, transfer chamber ( 70 ), a bypass chamber and tank inlet ( 26 ). The bypass chamber may receive a blocking wall for blocking communication between the chamber and the outlet.

1 . A control valve assembly for controlling the communication of water to and from a treatment tank and for controlling the regeneration of a treatment material contained by the treatment tank, comprising:
 a) a housing defining structure for connecting said control valve assembly to a tank inlet and a tank outlet;   b) an inlet chamber and an outlet chamber defined by said housing, said inlet chamber communicating with a source of water to be treated and said outlet chamber communicating with an outlet of said control valve assembly;   c) a bypass chamber defined by said housing in fluid communication with said outlet chamber;   d) a fluid pressure operated inlet valve for controlling the communication of said inlet chamber with said tank inlet, and controlling the communication of said inlet chamber with said bypass chamber;   e) said fluid pressure operated inlet valve having first and second seating surfaces associated with first and second seats;   f) said first seating surface engageable with said first seat, such that communication of said inlet chamber with said tank inlet is inhibited while communication between said inlet chamber and said transfer chamber is enabled; and,   g) said second seating surface being engageable with said second seat whereby communication between said inlet chamber and said transfer chamber is inhibited while enabling communication between said inlet chamber and said tank inlet.   
     
     
         2 . The control valve assembly of  claim 1 , wherein said first and second seating surfaces are formed on a valve element forming part of said inlet valve, using an over molding process. 
     
     
         3 . The control valve assembly of  claim 1 , wherein said bypass chamber is adapted to receive a blocking wail whereby communication between said transfer chamber and said outlet chamber is inhibited.