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This 1 1/2 inch boiler pressure relief valve is used in hot water heating and domestic supply boiler applications to protect against excessive pressures on all types of hot water heating supply boiler equipment. It consists of a bronze body construction with NPT threaded female inlet and NPT threaded female outlet (drain) connections, non-metallic disc-to-metal seating, stainless steel spring, and test lever. It resists corrosive water conditions, sticking and freezing, and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief, not as an operating control. The pressure relief is set at 100 psi (689.5 kPa) with corresponding high pressure ratings up to 5,290,000 BTU/hr.5,290,000 BTU/hr.

  • Non mechanical seat-to-disc alignment will not stick or freeze
  • Water seal of high temperature resisting material isolates spring working parts from water during relief
  • Body Material: Bronze
  • Brand: Watts
  • Buy American Act Compliant: YES
  • Inlet Connection Size: 1 1/2 IN
  • Inlet Connection Type: Female Threaded
  • Inlet Thread Type: NPT
  • Lead Free: NO
  • Maximum Temperature-Fahrenheit: 250
  • Maximum Working Pressure-PSI: 75
  • Outlet Connection Size: 1 1/2 IN
  • Outlet Connection Type: Female Threaded
  • Outlet Thread Type: NPT
  • Part Number: 0276890
  • Pressure Range: 30 to 150 PSI
  • Pressure Relief Setting-PSI: 100
  • Pressure Steam Discharge Capacity: 5,290,000 BTU per hour at 100 PSI
  • Protection Type: Pressure
  • Series: 174A
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Capacity (BTU):


Pressure Set Point:

100 psi

Connection Size:








Connection Type:


Thread Type:


Temperature Range (F):

250°F Max




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