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Lead-free brass adjustable relief valve with test lever

Watts

Watts 3/4 LF 530-C STD Adjustable Relief Valve

SKU CH-DC89-WP632 MPN 3/4

Lead-free brass relief valve adjusts from 50 to 175 psi for fire protection systems up to 180 °F

  • TypeDrain Components
  • MaterialLead-Free Brass
  • Adjustable pressure relief from 50 to 175 psi
  • Lead-free brass body meets FDA and NSF standards
  • Stainless steel spring resists corrosion for long service
  • Buna-N disc and seat seal reliably up to 180 °F
  • 3/4 in MNPT inlet and 1/2 in FNPT outlet for fire protection systems

Lead-Free Brass Relief Valve

The Watts 3/4 LF 530-C STD is a calibrated adjustable relief valve built for fire protection systems. Its lead-free brass body meets FDA and NSF standards for potable water safety. Designed for installers and facility managers who need reliable over-pressure protection on hydronic or sprinkler lines.

MNPT Inlet with FNPT Outlet

The valve uses a 3/4 inch male NPT inlet and a 1/2 inch female NPT outlet, allowing direct connection to standard pipe threads without extra adapters. A stainless steel spring and Buna-N disc and seat provide consistent reseating across the 50 to 175 psi adjustment range. No test lever is fitted, so manual inspection requires system depressurisation.

Verify Pressure and Temperature Limits

Confirm the system operating pressure stays within the 50 to 175 psi adjustable range and that fluid temperature will not exceed 180 degrees F. Ensure the piping layout accommodates the 3 inch overall height and 1 5/8 inch length. This model is not suited for applications requiring a test lever or higher temperature service.

Highlights

  • Adjustable pressure relief from 50 to 175 psi
  • Lead-free brass body meets FDA and NSF standards
  • Stainless steel spring resists corrosion for long service
  • Buna-N disc and seat seal reliably up to 180 °F
  • 3/4 in MNPT inlet and 1/2 in FNPT outlet for fire protection systems

Specifications

TypeDrain Components
MaterialLead-Free Brass
BrandWatts
Model3/4 LF 530-C STD

Questions about this item

What pressure range does the 530-C adjustable relief valve cover?

The valve is calibrated for a working range of 50 to 175 psi and can be set anywhere within that span.

What pipe threads are required to install the 3/4 LF 530-C valve?

It needs a 3/4-inch male NPT inlet connection and a 1/2-inch female NPT outlet connection.

How is the 530-C relief valve installed and what step is often missed?

Thread the male inlet into the system piping, then adjust the spring to the desired set pressure; the step often missed is confirming the setting with a gauge before placing the valve in service.

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