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Bronze Y strainer with female NPT threads and perforated stainless screen

Mueller Steam Specialty

Mueller Steam Specialty 581 CS Y Strainer 3/4" FNPT accessory

SKU CH-S8VZ-G25WR

A 3/4 inch FNPT Y-strainer with carbon-steel housing, 304 stainless perforated screen and Class 600 rating for steam or water service up to 750 °F

  • Handles 480 psi at 100°F for demanding steam lines
  • Carbon steel body rated Class 600 withstands 750°F
  • 304 stainless screen with .062 in perforations traps debris
  • 12 gpm Cv factor keeps flow efficient
  • 3/4 in FNPT ends install quickly on standard pipe

Mueller 581 CS Y Strainer 3/4" FNPT

This carbon steel Y strainer filters steam and water lines in commercial and industrial piping systems. The 3/4 inch female NPT connections suit standard threaded pipe assemblies. A 304 stainless steel perforated screen with 0.062 inch openings traps debris to protect downstream equipment. Rated for Class 600 service up to 750 degrees Fahrenheit and 1,480 psi at 100 degrees Fahrenheit.

Installation notes for the 581 CS

The screwed end design threads directly onto 3/4 inch NPT pipe without special tools. Flow direction must follow the arrow cast on the body to ensure proper screening. The 3/8 inch blow off port allows cleaning without removing the strainer from the line. Over tightening the cap can damage the screen seal and cause bypass leakage.

Capacity and pressure headroom

The Cv flow factor of 12 gpm handles typical branch line demands in steam and water service. Class 600 rating provides margin above many building service pressures. The 0.062 inch perforations clog faster than larger mesh screens in heavy sediment conditions. Buyers needing finer filtration or higher flow capacity should evaluate alternative strainer models.

Highlights

  • Handles 480 psi at 100°F for demanding steam lines
  • Carbon steel body rated Class 600 withstands 750°F
  • 304 stainless screen with .062 in perforations traps debris
  • 12 gpm Cv factor keeps flow efficient
  • 3/4 in FNPT ends install quickly on standard pipe

Specifications

BrandMUELLER STEAM SPECIALTY

Questions about this item

How can I confirm the 581 CS Y strainer is operating correctly after installation?

Verify that steam or water flows at the rated 12 gpm Cv factor without pressure drop beyond the 480 psi limit at 100°F and that no debris bypasses the 304 stainless steel 0.062 in perforated screen.

What comes in the box and what must be purchased separately for the 581 CS Y strainer?

The strainer body with integrated 304 stainless steel screen and 3/8 in blow-off port is supplied; mating 3/4 in NPT pipe fittings, gaskets and any required pipe sealant are not included.

Which version of the 581 CS Y strainer should I choose for my pressure and temperature requirements?

Select the Class 600 carbon steel model rated for 1,480 psi at 100°F and up to 750°F maximum temperature when your system operates within those limits.

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