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Bronze Y-pattern swing check valve, 1-inch FNPT ends, 3.6875 inches long

Milwaukee Valve

Milwaukee Valve 509Y 1" Swing Y Check Valve 3.6875 in

SKU CH-AZMQ-EKFQA

A 1-inch bronze swing Y check valve with FNPT connections, rated for 200 psi water and 125 psi steam at 150 °F

  • Size1"
  • TypeOther
  • Bronze construction resists corrosion up to 425 °F
  • Y-pattern swing design delivers 31 gpm full flow
  • Cracks open at just .5 psi for low-head systems
  • Rated 200 psi water at 150 °F and 125 psi steam
  • Installs horizontally or vertically with FNPT connections

1-Inch Bronze Y Swing Check Valve

The Milwaukee Valve 509Y is a bronze-bodied check valve with FNPT x FNPT connections sized for 1-inch piping. Its Y-pattern swing design allows horizontal or vertical mounting while providing a full-flow path. The unit measures 3.6875 inches overall length and is rated for temperatures from -20 to 425 degrees F.

0.5 PSI Cracking Pressure Opens With Minimal Head

A cracking pressure of .5 psi means the disc begins to lift almost immediately when flow starts, reducing the head loss required to initiate movement. The bronze seat and seal materials match the body for consistent sealing across the 200 psi water rating at 150 degrees F and 125 psi steam rating. Flow capacity reaches 31 gpm through the full-port opening.

No Accessories Or Software Included

The valve ships as a single component without gaskets, flange kits, actuators or configuration tools. Installers must supply thread sealant or tape compatible with bronze threads and verify orientation suits the mounting plane. No electronic interfaces or firmware are present, so integration depends entirely on mechanical piping design.

Highlights

  • Bronze construction resists corrosion up to 425 °F
  • Y-pattern swing design delivers 31 gpm full flow
  • Cracks open at just .5 psi for low-head systems
  • Rated 200 psi water at 150 °F and 125 psi steam
  • Installs horizontally or vertically with FNPT connections

Specifications

BrandMILWAUKEE VALVE
Size1"
TypeOther

Questions about this item

How much water can actually pass through the 31 gpm rating in a real installation?

The valve is rated for 31 gpm full flow with a 0.5 psi cracking pressure, so it opens easily and delivers the rated capacity under normal supply conditions.

What does the 125 psi WSP steam limit mean for my piping system?

It caps the valve at 125 psi saturated steam service; for hot water the limit is 200 psi at 150 °F, so the lower steam figure governs if steam is present.

How much space does the 3.6875 in overall length need in the line?

The valve measures 3.6875 in end-to-end with FNPT x FNPT connections, so allow that length plus thread engagement on each side for a straight run.

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