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Bronze swing check valve, 1 inch FNPT connections, 3.25 inch length

Milwaukee Valve

Milwaukee Valve 515 1" Swing Check Valve 3.25 in

SKU CH-Q7AF-DPFFN

A 1-inch bronze inline swing check valve rated for 31 gpm water flow and 300 psi at 150 °F

  • Size1"
  • TypeOther
  • Reliable flow control with inline swing mechanism
  • Durable bronze construction handles 300 psi water pressure
  • Operates from -20 °F to 406 °F
  • Low cracking pressure of .500 to .750 psi
  • 31 gpm capacity suits 1 in piping

1-Inch Bronze Swing Check Valve

The Milwaukee Valve 515 is a 1-inch inline swing check valve built from bronze with bronze seat and seal materials. It connects via FNPT x FNPT threads and has an overall length of 3.25 inches. This valve suits plumbing and hydronic systems that need automatic backflow prevention in a compact bronze body.

Sustained flow and pressure limits

Rated for a maximum water pressure of 300 psi at 150 degrees F and a maximum steam pressure of 150 psi WSP, the valve operates continuously between -20 degrees F and 406 degrees F. Its cracking pressure ranges from .500 to .750 psi, and it delivers a flow capacity of 31 gpm under steady-state conditions.

Horizontal installation and sealing notes

The valve must be mounted horizontally to ensure proper swing-disc operation and sealing. Bronze-on-bronze seating provides reliable closure, but debris in the line can prevent a tight seal and cause leakage. Verify thread compatibility and orient the flow arrow correctly during installation.

Highlights

  • Reliable flow control with inline swing mechanism
  • Durable bronze construction handles 300 psi water pressure
  • Operates from -20 °F to 406 °F
  • Low cracking pressure of .500 to .750 psi
  • 31 gpm capacity suits 1 in piping

Specifications

BrandMILWAUKEE VALVE
Size1"
TypeOther

Questions about this item

How much heat can the 515 swing check valve handle during continuous operation?

The bronze body and seat are rated for a maximum temperature of 406 °F, with a minimum of -20 °F, so it handles hot water and steam lines without degrading.

What piping must already be in place for this 1" FNPT valve to install?

You need 1-inch female NPT threads on both pipe ends; the valve installs inline horizontally between those connections.

Will the 515 valve work with older bronze piping systems running at lower pressure?

Yes — it seals at a cracking pressure of 0.500 to 0.750 psi and withstands up to 300 psi water pressure at 150 °F or 150 psi steam, matching legacy bronze installations.

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