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Bronze swing check valve, inline body, FNPT ends, 6.875 in overall length

Milwaukee Valve

Milwaukee Valve 509 3 in Swing Check Valve 6.875 in

SKU CH-52XP-3A3Z0

A 3-inch bronze swing check valve with FNPT connections rated for 297 gpm water flow at 200 psi and 125 psi steam

  • Prevents backflow with inline swing-check mechanism
  • Handles 297 gpm through 3 in FNPT connections
  • Bronze body and seat withstand 200 psi water pressure
  • Operates from -20 °F to 406 °F in horizontal or vertical mount
  • Opens at only .750 to 1.000 psi cracking pressure

Milwaukee Valve 509 3-Inch Swing Check Valve

The Milwaukee Valve 509 is a bronze swing check valve designed for three-inch piping systems. It uses an inline swing mechanism with FNPT connections to prevent backflow in water and steam lines. Rated for temperatures from minus 20 to 406 degrees Fahrenheit, it suits industrial and commercial plumbing installations.

Installation Requirements for Milwaukee Valve 509

Verify that your piping uses three-inch FNPT threads before ordering. The valve must be mounted in either a horizontal or vertical orientation as specified. Confirm system pressure does not exceed 200 psi at 150 degrees Fahrenheit for water or 125 psi WSP for steam service. Ensure the media temperature stays within the rated minus 20 to 406 degree Fahrenheit range.

Thermal and Flow Performance

In normal operation the valve handles water pressure up to 200 psi at 150 degrees Fahrenheit and steam pressure up to 125 psi WSP. The cracking pressure falls between .750 and 1.000 psi, allowing flow to begin with minimal differential. Rated flow capacity reaches 297 gallons per minute through the bronze body and seat. Bronze construction resists corrosion across the full temperature span.

How it compares

Measured against everything we stock in Faucet Valves & Replacement Parts, at today’s prices. Recalculated every night.

Price $447.99
Pricier than about 90% of the 1,132 comparable items (median $54.99).

Specifications

Product
Brand nameMILWAUKEE VALVE
Product typeOther

Questions about this item

What comes in the box and what extra parts are needed to install the 3 in swing check valve?

The box contains the valve body with FNPT threaded ends. You must supply pipe sealant or tape and the mating pipe nipples or fittings for the 3 in NPT connections.

How do I decide between the 0.750 psi and 1.000 psi cracking pressure ratings?

Choose the lower 0.750 psi figure for gravity-fed or low-head systems where the valve must open with minimal back-pressure; choose the higher 1.000 psi figure when a tighter seal against minor pressure surges is preferred.

What does the 297 gpm flow rating mean when the valve is fitted in a 3 in line?

It indicates the valve can pass up to 297 US gallons per minute of water through its 3 in bore at the rated pressure drop, so size the pump and piping to stay within that capacity.

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