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Bronze inline swing check valve, 3/4 inch FNPT connections, 2.625 inch length

Milwaukee Valve

Milwaukee Valve 515 3/4" Swing Check Valve 2.625 in

SKU CH-2B5G-9ZKH3

A bronze inline swing check valve with FNPT connections for 3/4 in pipe, rated 300 psi water and 150 psi steam at 406 °F

  • Size3/4"
  • TypeOther
  • Reliable back-flow prevention with inline swing-check mechanism
  • Durable bronze body and seat withstand 300 psi water pressure
  • Operates from -20 °F to 406 °F for wide temperature range
  • Low 0.5–0.75 psi cracking pressure opens with minimal flow
  • 18 gpm capacity suits 3/4" FNPT residential plumbing

Valve purpose and fit

The Milwaukee Valve 515 is a bronze inline swing check valve with 3/4 inch FNPT connections and a 2.625 inch overall length. It allows water or steam to flow in one direction while preventing backflow in plumbing and hydronic systems.

When the upgrade makes sense

Replace an older check valve when cracking pressure has drifted outside the .500 to .750 psi range or when the seat no longer seals at 300 psi water pressure or 150 psi steam pressure. The jump is worth it if the existing valve leaks, chatters, or cannot handle temperatures from -20 to 406 degrees Fahrenheit.

Build integration

The valve installs horizontally between two female NPT fittings and requires no external power or control. Its bronze body and seat handle 18 gallons per minute, freeing the system designer from adding a separate backflow preventer in compatible piping layouts.

Highlights

  • Reliable back-flow prevention with inline swing-check mechanism
  • Durable bronze body and seat withstand 300 psi water pressure
  • Operates from -20 °F to 406 °F for wide temperature range
  • Low 0.5–0.75 psi cracking pressure opens with minimal flow
  • 18 gpm capacity suits 3/4" FNPT residential plumbing

Specifications

BrandMILWAUKEE VALVE
Size3/4"
TypeOther

Questions about this item

What size female NPT threads does the 515 swing check valve use for inline connection?

The valve has 3/4 inch FNPT x FNPT ends for direct threading onto matching pipe.

Which orientation must the 515 valve be mounted in to operate correctly?

The valve must be installed horizontally; vertical mounting will prevent the swing disc from opening and closing properly.

When should the bronze seat and disc on the 515 valve be inspected or replaced?

Inspect the bronze seat and disc if flow drops below the rated 18 gpm or if leakage appears when the system is at the 300 psi water or 150 psi steam limits.

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