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Bronze Y-pattern swing check valve with FNPT ends

Milwaukee Valve

Milwaukee Valve 508 1-1/4" FNPT Bronze Swing Y Check Valve

SKU CH-5QPK-Z31CP

A bronze Y-swing check valve with FNPT connections that opens at 0.500 to 0.750 psi and delivers 54 gpm

  • Size1 1/4"
  • TypeOther
  • Prevents backflow with Y-pattern swing mechanism
  • Bronze body resists corrosion in water and steam systems
  • Operates reliably from -20 °F to 550 °F
  • Handles 400 psi water pressure at 150 °F
  • Low 0.5–0.75 psi cracking pressure opens easily

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

The Milwaukee Valve 508 uses a bronze body with a Y-pattern swing mechanism to allow flow in one direction only. Its 1-1/4 inch FNPT threaded connections suit residential and light-commercial piping systems. The design handles water, steam and compatible fluids within the rated pressure and temperature ranges.

Thermals noise and power draw

This mechanical valve has no electrical components, so it generates no noise and draws no power during operation. The bronze construction and chrome-cobalt seal tolerate continuous service up to 550 degrees Fahrenheit and as low as minus 20 degrees Fahrenheit. Cracking pressure opens between 0.500 and 0.750 psi, allowing flow to start with minimal upstream head.

Horizontal mounting and pressure limits

Installation requires horizontal orientation to ensure the swing disc seats correctly. Maximum water pressure is rated at 400 psi at 150 degrees Fahrenheit, while steam service is limited to 200 psi WSP. The valve delivers a flow capacity of 54 gpm, freeing system designers from oversizing adjacent components when pressure drop must stay low.

Highlights

  • Prevents backflow with Y-pattern swing mechanism
  • Bronze body resists corrosion in water and steam systems
  • Operates reliably from -20 °F to 550 °F
  • Handles 400 psi water pressure at 150 °F
  • Low 0.5–0.75 psi cracking pressure opens easily

Specifications

BrandMILWAUKEE VALVE
Size1 1/4"
TypeOther

Questions about this item

How do I install the 508 bronze swing Y check valve with its 1-1/4" FNPT connections?

Thread the valve onto the 1-1/4" FNPT pipe ends using pipe sealant on the male threads, then tighten with a wrench on the valve body flats — not the bonnet — so the Y-pattern body stays horizontal as required for the swing disc to seat properly.

What maintenance or replacement will the bronze seat and chrome-cobalt seal need over time?

Inspect the bronze seat and chrome-cobalt seal annually for wear or mineral buildup; if the disc no longer seals at the 0.500 to 0.750 psi cracking pressure, replace the internal swing assembly rather than the whole valve body.

At what pressure limit does the valve reach its maximum rating first during sustained hot-water service?

The 400 psi water-pressure rating at 150°F is the limiting factor before the 200 psi steam rating or 550°F temperature ceiling would be reached in typical hot-water systems.

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