MODEL 118-3

MODEL 118-3


The Model 118-3 operates as a pressure relief valve by opening at a pressure above its set point. In addition, it provides extra protection against surges associated with power failure or other pump failure by opening in “anticipation” of the high pressure wave to follow. By being already open when the high pressure wave hits, any potential surge is harmlessly bypassed to atmosphere.

Typical examples include:

  • Pump systems
  • Municipal distribution systems
  • Irrigation systems


  • Opens on power failure – remains open for preset time – slowly recloses
  • Opens on low pressure – remains open for preset time – slowly recloses
  • Opens on high pressure – closes slowly when pressure returns to normal
  • Operates over a wide flow range
  • Low and high pressures are adjustable
  • Quick opening and adjustable closing speed
  • Adjustable time delay for automatic reclose (power failure and low pressure modes)
  • Can be maintained without removal from the line
  • Factory tested and can be pre-set to your requirements