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Bronze Y-pattern swing check valve with FNPT ends

Milwaukee Valve

Milwaukee Valve 508 3/4" FNPT Bronze Swing Y Check Valve

SKU CH-RR59-0QX80

A bronze Y-pattern swing check valve with FNPT connections that allows 18 gpm flow and handles 400 psi at 150 °F

  • Size3/4"
  • TypeOther
  • Bronze body resists corrosion for long service life
  • Y-pattern swing design allows 18 gpm flow with minimal pressure drop
  • Rated for 400 psi water pressure at 150 °F operating temperature
  • Withstands 200 psi steam pressure for heating-system use
  • Opens at 0.5 to 0.75 psi cracking pressure for reliable flow initiation

Application & Sizing

This 3/4 inch FNPT bronze swing check valve suits water lines up to 400 psi at 150 °F and steam lines up to 200 psi WSP. It operates from -20 °F to 550 °F with a cracking pressure between .500 and .750 psi.

Who Should Look Elsewhere

Installations requiring vertical flow orientation cannot use this valve because mounting is horizontal only. Systems needing flow rates above 18 gpm or pressures beyond the stated limits should select a different model.

Deciding Specification

The Y-pattern bronze body with chrome-cobalt seal and 3/4 inch FNPT connections determines fit. Verify pipe size, pressure class and temperature range against the 400 psi water and 200 psi steam ratings before ordering.

Highlights

  • Bronze body resists corrosion for long service life
  • Y-pattern swing design allows 18 gpm flow with minimal pressure drop
  • Rated for 400 psi water pressure at 150 °F operating temperature
  • Withstands 200 psi steam pressure for heating-system use
  • Opens at 0.5 to 0.75 psi cracking pressure for reliable flow initiation

Specifications

BrandMILWAUKEE VALVE
Size3/4"
TypeOther

Questions about this item

What cracking pressure range does the 508 valve’s swing mechanism require to open?

The valve begins to open between 0.500 and 0.750 psi, allowing flow once upstream pressure exceeds that narrow band.

What piping orientation and connection type must the 3/4" bronze body accommodate?

It installs horizontally on 3/4 inch FNPT x FNPT threads, so both inlet and outlet need matching female NPT fittings.

How is the 508 valve installed and which step is most often missed?

Thread the valve into horizontal piping with flow arrow pointing downstream; the step often missed is confirming the arrow matches actual flow direction before tightening.

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