High Pressure, Booster Pump Control Valve Model 840

The Model 840 High Pressure, Booster Pump Control Valve is a hydraulically operated, piston actuated active check valve that opens fully or shuts off in response to electric signals. It isolates the pump from the system during pump starting and stopping, to prevent pipeline surges.

  • Line pressure driven
    • Independent operation
    • No motor required
    • Long term drip tight sealing
  • Solenoid controlled
    • Low cost wiring
    • Wide ranges of pressures and voltages
    • Normally Open or Normally Closed
  • Check feature (spring loaded type)
    • Replaces line sized check valve
    • Fail-safe mechanical closure
  • In-line serviceable – Easy maintenance
  • Double chamber
    • Full powered opening (option “B”) and closing
    • Non-slam opening and closing characteristic
  • Balanced seal disk – High flow capacity
  • Flexible design – Easy addition of hydraulic features

Typical Applications

In this system, a pump battery supplies the main line through a manifold. The Model 840, installed downstream from each pump:

  • Prevents surge generation rather than minimizing surge damage
  • Provides surge free starting and stopping of supplementary pumps
  • Allows surge free switching between “on-duty” pumps
  • Delays reaction for variable speed primary pump to single speed supplementary pump going on line or off line


English Spare Parts - Waterworks
English 800 Series Engineering
English 800 Series Ordering Guide