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Fisher™ Type 289P Relief Valve or Backpressure Regulator
Fisher Type 289P pilot-operated relief valve is used to provide over pressure protection for downstream systems suitable for service on natural gas, air, propane, or any other operating medium not corrosive to the internal parts.
Smooth opening action minimizes system pressure surges during emergency action. Very little buildup over set pressure is required to completely open the main valve for max relief capacity. The external control line provides quick, accurate pressure registration.

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Fisher™ Type 289P Relief Valve or Backpressure Regulator


Body Sizes and End Connection Styles
1 or 2 NPT
Maximum Relief (Inlet) Pressure
1 NPT: 50 psig / 3.4 bar over relief set pressure or 110 psig / 7.6 bar whichever is lower
2 NPT: 15 psig / 1.0 bar
Relief Set Pressure Range
1 NPT: 10 to 100 psig / 0.69 to 7.0 bar in three ranges
2 NPT: 14-inches w.c. to 10 psig / 35 mbar to 0.69 bar in two ranges
Pressure Registration
Temperature Capabilities
With Nitrile (NBR): -20 to 180°F / -29 to 82°C
With Fluorocarbon (FKM): 0 to 300°F / -18 to 149°C
Approximate Weights
1 NPT: 5 pounds / 2.3 kg
2 NPT: 15 pounds / 6.8 kg


  • Economical
  • High Relief Capacity with Low Buildup
  • Accurate
  • Fast Reseat After Operation
  • Ease of Maintenance
  • Rugged Construction
  • Corrosion Resistant Fasteners
  • Full Usable Capacity