Model 748

Model 748 - Pump Circulation and Pressure Sustaining Control Valve

WW_748_Big_GalleryThe Model 748 Pump Circulation and Pressure Sustaining Control Valve adds the advanced “active check valve” logic to standard pump systems. It is a hydraulically operated, diaphragm actuated control valve that opens or shuts off in response to electric signals (during the pump starting and stopping processes) while sustaining discharge pressure. By progressively circulating pump flow, it enables a standard mechanical check valve to respond gradually during the pump starting and stopping processes, preventing pipeline surges.


Features and Benefits

  • Line pressure driven
    • Independent operation
    • No motor required
    • Long term drip tight sealing
  • Off-line (circulation) installation
    • Replaces in-line “active check valve”
    • Reduced system energy consumption
    • Low capital investment
    • Short valve operating time
    • Applicable to existing systems
  • Solenoid controlled
    • Wide ranges of pressures and voltages
    • Low cost wiring
  • In-line serviceable – Easy maintenance
  • Double chamber
    • Full powered opening and closing
    • Non-slam opening and closing characteristic
    • Protected diaphragm


Typical Application

In this system, a pump battery supplies the main line through a manifold. Where standard mechanical check valves are specified or already exist, the Model 748 enhances their function by:

  • Preventing surge generation rather than minimizing surge damage
  • Providing surge free on and off-line sequencing of single speed pumps
  • Surge free switching between “on-duty” pumps
  • Delaying variable speed primary pump reaction to single speed supplementary pump going on or off-line