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Bronze inline swing check valve with FNPT connections, 3.25 inches long

Milwaukee Valve

Milwaukee Valve 509 1" Swing Check Valve 3.25 in

SKU CH-SBRB-3RFD8

A 1-inch bronze swing check valve with FNPT connections, 0.75–1.0 psi cracking pressure, 31 gpm flow and 200 psi water rating at 150 °F

  • Size1"
  • TypeOther
  • Bronze body resists corrosion in water lines
  • 31 gpm flow capacity at 150 °F
  • 200 psi water pressure rating at 150 °F
  • Operates from -20 °F to 406 °F
  • 750–1.000 psi cracking pressure prevents backflow

1" Bronze Swing Check Valve

The Milwaukee Valve 509 is a 1-inch bronze swing check valve designed for inline installation in plumbing and hydronic systems. Its FNPT x FNPT threaded connections suit standard pipework, and the horizontal or vertical mounting orientation gives installers flexibility on site. The valve serves contractors and maintenance teams who need reliable back-flow prevention in water or steam lines.

Thermals noise and power draw

The valve operates without external power so it produces no noise and draws no electricity. Bronze body construction handles water temperatures up to 406 degrees Fahrenheit and steam temperatures of 150 degrees Fahrenheit at 125 psi. Maximum water pressure is rated at 200 psi at 150 degrees Fahrenheit, while the cracking pressure range sits between 0.750 and 1.000 psi.

Brass seat and flow capacity

A brass seat seals against the bronze disc to maintain tight shut-off over repeated cycles. The flow coefficient of 31 gallons per minute lets the valve pass high volumes with minimal pressure drop. No accessories or software are bundled; the unit ships as a single valve body ready for threading into the line.

Highlights

  • Bronze body resists corrosion in water lines
  • 31 gpm flow capacity at 150 °F
  • 200 psi water pressure rating at 150 °F
  • Operates from -20 °F to 406 °F
  • 750–1.000 psi cracking pressure prevents backflow

Specifications

BrandMILWAUKEE VALVE
Size1"
TypeOther

Questions about this item

How do I install the 1" FNPT swing check valve and what orientation mistake should I avoid?

Thread the valve onto 1" FNPT pipe connections using pipe sealant; it mounts horizontally or vertically with flow upward, but never install it vertically with flow downward or the disc will not seat.

Which internal parts of the bronze-bodied 509 valve will need replacement over time?

The brass seat and bronze disc seal are the wear surfaces; debris or corrosion can prevent tight closure, so plan to inspect and possibly replace the seat and disc assembly during routine system maintenance.

What pressure or temperature limit will be reached first during sustained hot-water service at 150 °F?

At 150 °F the valve is rated for 200 psi water pressure, while its steam limit is 125 psi WSP; in continuous hot-water use the 200 psi water-pressure ceiling is the governing limit.

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