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530C Watts

Calibrated Pressure Relief Valves

Series 530C Calibrated Pressure Relief Valves are used in commercial, residential and industrial applications to protect against excessive pressure in systems containing water, oil, or air. hey have a bronze body construction with NPT threaded male inlet and NPT threaded female (drain) outlet connections, stainless steel spring, brass bonnet, Buna-N disc, and Buna-N O-ring. Series 530C has a calibrated adjustment feature for setting the valve to the required relief pressure, and is ideal for by-pass thermal expansion pressure relief (not ASME approved). Model 530FP is for use in fire protection systems. Maximum Pressure: 300psi (20.67 bar). Adjustable Pressure Ranges: Sizes 1/2, 3/4 in. - 50 to 175psi (3.45 to 12.06 bar); Size 3/4 in. - 100 to 300psi (6.89 to 20.67 bar).


  • Valve protects against excessive pressure in system containing water, oil, or air
  • Buna-N disc and O-ring
  • All brass construction with stainless steel spring
  • Calibrated adjustment feature for setting valve to required relief pressure

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Approval Information

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