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Choose Watts 530C ½"Calibrated Pressure Relief Valve when your project calls for bypass thermal expansion relief. Spring operated; resets after quietly releasing pressure. Maximum working temperature is 180 degrees F. From the manufacturer: MFR Part # 530C 1/2 Item Model # 530-C 1/2". Calculations show pressure-reducing valves can save as much as 30% on domestic water heating costs, prevent water waste and perhaps even lower municipal sewer usage fees.


  • Guards against excessive pressure in water, oil or air systems used in commercial, residential or industrial applications, including fire protection systems
  • All-brass construction features an NPT threaded male inlet and NPT threaded female (drain) outlet connections; a stainless-steel spring; a brass bonnet; a Buna-N disc and a Buna-N O-ring
  • Calibrated adjustment feature sets valve to the required relief pressure
  • Maximum pressure is 300 psi (20.67 bar); adjustable range is 50 to 175 psi (3.45 to 12.06 bar)

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