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Bronze Y-pattern swing check valve, 3/4 inch FNPT connections

Milwaukee Valve

Milwaukee Valve 515Y 3/4" FNPT Bronze Swing Y Check Valve

SKU CH-ZKGR-RRPFD

A bronze Y-pattern swing check valve with FNPT connections that prevents back-flow in horizontal or vertical lines up to 300 psi at 150 °F

  • Size3/4"
  • TypeOther
  • Bronze body resists corrosion in water lines
  • Y-pattern swing design reduces pressure drop
  • 5 psi cracking pressure opens with minimal flow
  • Rated 300 psi at 150 °F for high-pressure service
  • Operates from -20 °F to 425 °F across seasons

What this valve is and who fits it

The Milwaukee Valve 515Y is a 3/4" FNPT bronze swing Y check valve designed for residential and light commercial plumbing. It allows flow in one direction while automatically preventing backflow. Installers who need a reliable, non-return device for water lines will find it matches standard threaded pipe connections. Buyers who require flanged ends or larger diameters must select a different model.

Build quality and daily implications

The body and seal are both bronze, giving corrosion resistance across a temperature range of -20 to 425 degrees F. Rated for 300 psi at 150 degrees F, it handles typical municipal and well-pressure systems. The Y-pattern swing design reduces turbulence and can be mounted in horizontal or vertical runs, simplifying layout in tight mechanical rooms. No special tools are needed beyond standard pipe wrenches for the FNPT threads.

Limits of the swing-check interface

A cracking pressure of .5 psi means the disc opens with minimal flow, but it will not seal against reverse pressure below that threshold. The bronze disc seats metal-to-metal, so fine debris can prevent full closure over time. The valve is not suited for pulsating pump discharge or media containing abrasive solids. Systems needing zero-leakage shut-off or automated control should use a different valve type.

Highlights

  • Bronze body resists corrosion in water lines
  • Y-pattern swing design reduces pressure drop
  • 5 psi cracking pressure opens with minimal flow
  • Rated 300 psi at 150 °F for high-pressure service
  • Operates from -20 °F to 425 °F across seasons

Specifications

BrandMILWAUKEE VALVE
Size3/4"
TypeOther

Questions about this item

What does the 0.5 psi cracking pressure mean for flow restriction?

The valve begins to open at 0.5 psi differential, so flow starts with minimal back-pressure.

What pipe preparation does the 3/4 inch FNPT connection require?

Use 3/4 inch male NPT threads with sealant tape or compound on the pipe ends.

How should the valve be oriented during installation?

Mount horizontally or vertically with flow direction arrow pointing downstream; the swing disc must hang freely.

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