High Pressure, Booster Pump Control and Pressure Sustaining Valve Model 843

The Model 843 High Pressure, Booster Pump Control & Pressure Sustaining Valve is a hydraulically operated, piston actuated active check valve that opens or shuts off in response to electric signals.

It isolates the pump from the system during pump starting and stopping, to prevent pipeline surges. While open, it sustains minimum discharge pressure or pump differential pressure regardless of fluctuating flow.

  • Line pressure driven
    •  Independent operation
    •  No motor required
    •  Long term drip tight sealing
  • Solenoid controlled
    •  Low power consumption
    •  Low cost wiring
    •  Wide ranges of pressures and voltages
    •  Normally Open or Normally Closed
  • Check feature
    •  Replaces line sized check valve
    •  Fail-safe mechanical closure
  •  In-line serviceable – Easy maintenance
  •  Flexible design – Easy addition of hydraulic features

Typical Application


Network Over Demand
Network demand is greater than pump design

  •  During empty pipeline filling
  •  During over demand by consumers
  •  When the pump pressure specification is much higher

than system resistance
Any of these factors might cause pump overload and
cavitation damage.
The Model 843, by adding a pressure sustaining feature to
the Booster Pump Control Valve, ensures that the pump
operates within design specifications protecting both the
pump and the system.
When pump upstream pressure varies use the model
WW-843-06 with differential pressure sensing

English 843 Product Page
English 800 Series Ordering Guide
English 800 Series Engineering
English Spare Parts – Waterworks