• Prioritizing pressure zones
  • Ensuring controlled pipeline fill-up
  • Preventing pipeline emptying
  • Pump overload and cavitation protection
  • Safeguarding pump minimum flow
  • Excessive line pressure protection


The Model 730 Pressure Relief/Sustaining Valve is a hydraulically operated, diaphragm actuated control valve that can fulfill either of two separate functions.

When installed in-line, it sustains minimum pre-set, upstream (back) pressure regardless of fluctuating flow or varying downstream pressure. When installed as a circulation valve, it relieves excessive line pressure when above maximum pre-set.

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