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Bronze Y-pattern swing check valve with threaded FNPT ends

Milwaukee Valve

Milwaukee Valve 509Y 1 1/4" Bronze Swing Y Check Valve FNPT

SKU CH-J9GV-QFGYJ

A bronze Y-pattern swing check valve with FNPT connections that permits flow in one direction while preventing back-flow up to 200 psi at 150 °F

  • Size1 1/4"
  • TypeOther
  • Bronze body resists corrosion for long service life
  • Y-pattern swing design reduces flow restriction and pressure drop
  • Rated for 200 psi water pressure at 150 °F
  • Operates from -20 °F to 425 °F for wide temperature range
  • FNPT connections allow direct threaded installation without adapters

Bronze swing check valve for residential plumbing

The Milwaukee Valve 509Y is a 1 1/4" bronze Y-pattern check valve with FNPT threaded connections on both ends. It is designed for horizontal or vertical installation in water and steam lines where back-flow prevention is required.

Threaded FNPT ends simplify pipe fitting

The female NPT threads allow direct connection to standard 1 1/4" male pipe nipples without soldering or flanges. Ensure the arrow on the body matches the flow direction and provide enough straight pipe run so turbulence does not prevent the disc from seating fully.

Rated for 200 psi water at 150°F and 125 psi steam

The bronze body and seat handle water pressure up to 200 psi at 150°F and saturated steam up to 125 psi. Temperature limits extend from -20°F to 425°F, so the valve is not suited for cryogenic fluids or super-heated steam systems beyond these boundaries.

Highlights

  • Bronze body resists corrosion for long service life
  • Y-pattern swing design reduces flow restriction and pressure drop
  • Rated for 200 psi water pressure at 150 °F
  • Operates from -20 °F to 425 °F for wide temperature range
  • FNPT connections allow direct threaded installation without adapters

Specifications

BrandMILWAUKEE VALVE
Size1 1/4"
TypeOther

Questions about this item

How do I confirm the 509Y is opening at the .5 psi cracking pressure after installation?

Apply flow in the direction of the arrow and watch for movement at very low head; the disc should lift once pressure exceeds .5 psi, allowing up to 54 gpm through the bronze seat.

What comes with the 509Y and what must I supply?

The valve body with FNPT x FNPT threads is included; you must provide 1 1/4 inch NPT pipe nipples, thread sealant and any mounting brackets or supports.

Which pressure rating should I select for a 150 Degrees F water line?

Choose the 200 psi @ 150 Degrees F water rating; the same valve also carries a 125 psi WSP steam rating and operates from -20 Degrees F to 425 Degrees F.

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