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Bronze inline swing check valve with FNPT connections, 1-1/2 inch size

Milwaukee Valve

Milwaukee Valve 509 1-1/2" FNPT Bronze Swing Check Valve

SKU CH-M6TR-ZFWGZ

Bronze inline swing check valve with FNPT connections handles 76 gpm water flow at 200 psi and 125 psi steam pressure

  • Size1 1/2 in
  • Bronze body resists corrosion for long service life
  • Inline swing design allows horizontal or vertical installation
  • Cracking pressure of .750 to 1.000 psi prevents unwanted backflow
  • Rated for 200 psi water pressure at 150°F
  • Handles flow up to 76 gpm for efficient system performance

1-1/2" FNPT Bronze Swing Check Valve

The Milwaukee Valve 509 is a 1-1/2 inch bronze swing check valve with female NPT connections on both ends. It is designed for inline installation in plumbing and hydronic systems where automatic backflow prevention is required. The valve operates in horizontal or vertical orientations with flow in the upward direction.

Capacity and headroom

The valve provides a flow capacity of 76 gpm and handles a maximum water pressure of 200 psi at 150 degrees Fahrenheit. It also supports a maximum steam pressure of 125 psi WSP. The cracking pressure ranges from .750 to 1.000 psi, and the temperature range spans from -20 to 406 degrees Fahrenheit.

What this replaces or upgrades

This valve replaces a missing or failed check valve in residential or light commercial piping where bronze construction and FNPT threads are specified. The upgrade is worth it when the existing valve leaks, sticks, or cannot meet the 200 psi water or 125 psi steam ratings required by the system design.

How it compares

Measured against everything we stock in Bath Accessories & Soap Dispensers, at today’s prices. Recalculated every night.

Price $98.99
Pricier than about 73% of the 1,499 comparable items (median $39.99).

Specifications

Product
Brand nameMILWAUKEE VALVE
Product typeOther
Size & build
Size1 1/2 in

Questions about this item

Will the 1-1/2" FNPT connections thread directly onto my existing Schedule 40 bronze piping without adapters?

Yes, the valve uses FNPT x FNPT threads matching standard 1-1/2" NPT pipe so it screws onto existing bronze piping without extra fittings.

How can I confirm the swing check is opening fully at the rated 76 gpm flow after installation?

With water flowing at 76 gpm the disc should be fully open; listen for quiet flow and check that downstream pressure drop stays near the 0.750 to 1.000 psi cracking range.

Does the box include flange gaskets or thread sealant for the FNPT connections?

The valve ships alone; you must supply PTFE tape or pipe dope for the FNPT threads and any flange gaskets if you are adapting to flanged pipe.

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