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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 in (2.54 cm)
  • 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.

How it compares

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

Price $94.99
Pricier than about 72% of the 1,499 comparable items (median $39.99).

Specifications

Product
Brand nameMILWAUKEE VALVE
Product typeOther
Size & build
Size1 in (2.54 cm)

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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