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Bronze Y-pattern swing check valve with FNPT ends

Milwaukee Valve

Milwaukee Valve 515Y 1-1/4" FNPT Bronze Swing Y Check Valve

SKU CH-DYA7-C4D9T

Bronze Y-pattern swing check valve with 54 gpm flow capacity, 0.5 psi cracking pressure and 300 psi water rating from -20 °F to 425 °F

  • Size1 1/4"
  • TypeOther
  • Bronze construction resists corrosion at 300 psi water pressure
  • Y-pattern swing design delivers 54 gpm full flow
  • Low 0.5 psi cracking pressure opens easily
  • Operates from -20 to 425 degrees Fahrenheit
  • 150 psi steam rating suits heating systems

Application & Fit

The Milwaukee Valve 515Y is a 1-1/4" FNPT bronze swing Y check valve designed for water and steam lines in commercial and residential plumbing systems. It handles a maximum water pressure of 300 psi at 150 degrees F and a maximum steam pressure of 150 psi WSP. The valve operates across a temperature range from -20 degrees F to 425 degrees F with a flow capacity of 54 gpm. It suits installers needing reliable backflow prevention in horizontal or vertical piping.

Installation Notes

The valve connects via FNPT x FNPT threads and can be mounted in horizontal or vertical orientations without special tools. A cracking pressure of .5 psi means the disc opens with minimal flow, reducing the chance of water hammer in low-pressure systems. The bronze body and seat resist corrosion, but thread sealant must be compatible with bronze to avoid leaks. Over-tightening the connections can distort the seat and prevent full closure.

Pre-Order Checks

Verify that the existing piping uses 1-1/4" FNPT threads and that system pressure does not exceed 300 psi for water or 150 psi for steam. Confirm the operating temperature stays within the -20 degrees F to 425 degrees F limits. Ensure the flow direction matches the valve's swing design and that there is enough straight pipe run to avoid turbulence at the inlet. The bronze construction is not suitable for potable water systems requiring lead-free materials.

Highlights

  • Bronze construction resists corrosion at 300 psi water pressure
  • Y-pattern swing design delivers 54 gpm full flow
  • Low 0.5 psi cracking pressure opens easily
  • Operates from -20 to 425 degrees Fahrenheit
  • 150 psi steam rating suits heating systems

Specifications

BrandMILWAUKEE VALVE
Size1 1/4"
TypeOther

Questions about this item

How can I confirm the 515Y valve is sealing properly after installation?

Pressurize the line up to 300 psi at 150 °F and verify no leakage past the bronze seat; the 0.5 psi cracking pressure means the disc should open with minimal flow and close tightly when flow stops.

What comes with the 515Y valve and what must I supply?

The valve body with FNPT threads is supplied; you must provide compatible 1-1/4" NPT pipe nipples, thread sealant or tape, and any required mounting brackets or supports.

Which 515Y version suits a 54 gpm hot-water loop at 150 °F?

The listed 515Y with bronze body, 300 psi water rating at 150 °F and 54 gpm full-flow capacity matches those conditions directly.

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