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Small bronze check valve with threaded FNPT ends

Milwaukee Valve

Milwaukee Valve UP509 3/8" Bronze Spring Check Valve

SKU CH-RHZQ-VX3GT

3/8-inch bronze spring check valve allows 6 gpm full flow with a 0.75 to 1.0 psi cracking pressure, rated to 300 psi at 150 °F and 200 °F maximum temperature

  • TypeOther
  • Low-lead bronze body for safer potable water
  • 750–1.000 psi cracking pressure prevents backflow
  • Rated 300 psi at 150 °F for reliable service
  • Operates from –20 °F to 200 °F in horizontal lines
  • 3/8" FNPT inline swing design delivers 6 gpm full flow

3/8" Bronze Spring Check Valve

This 3/8-inch bronze check valve uses an inline swing mechanism to prevent backflow in residential plumbing. It connects via FNPT threads on both ends and is rated for water pressures up to 300 psi at 150 degrees Fahrenheit. The valve operates between -20 and 200 degrees Fahrenheit and delivers a full flow rate of 6 gpm. It suits installers needing a low-lead bronze body for potable water lines.

Low-lead bronze body and brass seat

The bronze body meets low-lead requirements for drinking water systems while the brass seat provides a durable sealing surface. A cracking pressure between .750 and 1.000 psi ensures the valve opens reliably under low head conditions. Full flow design minimises restriction when the valve is open. Horizontal mounting orientation is required for proper operation.

Simple FNPT threaded installation

Threaded FNPT connections allow direct assembly onto 3/8-inch pipe without soldering or special tools. Installers must orient the valve horizontally; vertical mounting will prevent the swing mechanism from functioning correctly. The valve is not rated for steam service. Buyers needing steam-rated components or larger pipe diameters should select a different model.

Highlights

  • Low-lead bronze body for safer potable water
  • 750–1.000 psi cracking pressure prevents backflow
  • Rated 300 psi at 150 °F for reliable service
  • Operates from –20 °F to 200 °F in horizontal lines
  • 3/8" FNPT inline swing design delivers 6 gpm full flow

Specifications

BrandMILWAUKEE VALVE
TypeOther

Questions about this item

How often does the bronze seat and brass seal on the UP509 need replacement under normal water service?

The bronze body and brass seat are built for continuous service up to 300 psi at 150 °F and 200 °F maximum temperature; no scheduled replacement interval is required for these parts.

What pressure or temperature limit will the UP509 reach first during sustained hot-water circulation?

The valve is rated for 300 psi maximum water pressure at 150 °F and a 200 °F maximum temperature; the 300 psi limit at 150 °F will govern before the temperature ceiling in most hot-water loops.

Does the UP509 spring-check generate noticeable vibration or heat when installed horizontally in a 6 gpm recirculation line?

With a cracking pressure of .750 to 1.000 psi and full-flow design at 6 gpm, the valve operates quietly and adds negligible heat in horizontal mounting.

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