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Fisher 289H-42 Pressure Relief Valve 1" NPT 4-15 PSI

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Special Price $442.94 Regular Price $491.66
Out of stock
SKU
289H-42
The Fisher 289H-42 Pressure Relief Valve is used to control the pressure element by letting excess accumulation escape if it rises to predetermined levels, typically in gas and fluid control lines in HVAC systems to operate safely. Its operation is based on opening in a range of 4-15 PSI to release pressure and closing once normal levels are achieved. It has a 1" NPT connection and fits into the line to manage the pressure under control. It is attached to upstream, and downstream components to work properly and is installed in the piping system.
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HVAC Controls & Electrical, Valves
Manufacturer:
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Specifications

  • Type: Regulator
  • Size: 1" NPT
  • Pressure Range: 4-15PSI
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Product Questions (2)
Customer Questions
What maintenance is required for the Fisher 289H-42 Pressure Relief Valve?

Regularly inspect the valve for corrosion, leaks, or debris buildup. Test the valve periodically to ensure it opens at the correct pressure. Clean the inlet and outlet ports and check that connections are tight. Always relieve system pressure before maintenance.

What are common issues with the Fisher 289H-42 Pressure Relief Valve?

  • Valve failing to open at set pressure.
  • Leakage from the valve seat.
  • Corrosion or mineral buildup affecting performance.
  • Sticking or sluggish operation due to debris.

Installation Steps

Step 1: Turn off system pressure and ensure the piping is depressurized.

Step 2: Remove the existing pressure relief valve from the system.

Step 3: Clean the threaded connection and apply pipe sealant or Teflon tape.

Step 4: Screw in the new valve, tightening securely without overtightening.

Step 5: Ensure the discharge path is clear and properly directed.

Step 6: Restore system pressure and test the valve for proper operation and sealing.