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Bronze inline swing check valve with FNPT connections

Milwaukee Valve

Milwaukee Valve 515 1-1/2" FNPT Bronze Swing Check Valve

SKU CH-Z3QP-D42AJ

A bronze inline swing check valve with FNPT connections, rated to 300 psi at 150 °F and 150 psi steam, handling 76 gpm flow

  • Size1 1/2"
  • TypeOther
  • Bronze body resists corrosion for long service life
  • Swing-check design allows full 76 gpm flow with minimal restriction
  • Rated for 300 psi water pressure at 150 °F
  • Operates reliably from -20 °F to 406 °F
  • Low 0.5–0.75 psi cracking pressure opens easily

Valve purpose and fit

This Milwaukee Valve 515 swing check valve is designed for plumbing systems that need automatic back-flow prevention. It suits installers and maintenance teams working on water or steam lines where a bronze body and FNPT connections are specified.

Deciding specification

The valve operates with a cracking pressure between .500 and .750 psi and handles up to 300 psi water pressure at 150 degrees F or 150 psi saturated steam. Its bronze seat and seal withstand temperatures from -20 to 406 degrees F while delivering a flow capacity of 76 gpm.

Installation notes

The inline swing design mounts horizontally on 1-1/2 inch FNPT pipe threads. Correct orientation is critical because the hinge pin must sit level to let the disc swing freely. Debris in the line can prevent full closure, so flushing before installation avoids leaks.

Highlights

  • Bronze body resists corrosion for long service life
  • Swing-check design allows full 76 gpm flow with minimal restriction
  • Rated for 300 psi water pressure at 150 °F
  • Operates reliably from -20 °F to 406 °F
  • Low 0.5–0.75 psi cracking pressure opens easily

Specifications

BrandMILWAUKEE VALVE
Size1 1/2"
TypeOther

Questions about this item

What does the 76 gpm flow rating mean when the valve is installed in a piping system?

It indicates the valve can pass up to 76 gallons per minute of water under normal operating conditions without excessive pressure drop.

How does the FNPT connection type limit the maximum pressure the valve can handle?

The FNPT threaded ends are rated for 300 psi water pressure at 150 degrees F and 150 psi steam pressure, which are the practical limits for this connection style.

What physical space and orientation are required to mount this 1-1/2 inch bronze swing check valve?

It must be installed horizontally in a pipeline with enough straight pipe length to accommodate the 1-1/2 inch FNPT threaded body and allow the swing disc to open fully.

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