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Grey cast iron wafer check valve with dual discs and flanged connections

Mueller Steam Specialty

Mueller Steam Specialty 71AHB3H 4 inch Cast Iron Wafer Double Disc Check Valve

SKU CH-FZBN-BQY7Z

Cast iron wafer double-disc check valve for 4-inch flanged piping, rated 200 psi at 150°F with Buna-N seals and 316 stainless steel springs

  • TypeOther
  • Prevents backflow with double-disc wafer design
  • Cast iron body handles 200 psi at 150 Degrees F
  • Operates up to 100 Degrees F in process piping
  • 316 stainless steel spring resists corrosion
  • Buna-N seals suit horizontal or vertical mounting

4-Inch Cast Iron Wafer Check Valve

This Mueller Steam Specialty 71AHB3H valve installs between flanges in process piping systems. The cast iron body with Buna-N seals handles water up to 200 psi at 150 degrees Fahrenheit and temperatures up to 100 degrees Fahrenheit. A 316 stainless steel spring ensures reliable closure in horizontal or vertical mounting orientations. The wafer design saves space compared to full-bodied check valves.

Replaces Full-Bodied Swing Check Valves

The wafer body fits between existing flanges without changing pipe layout, making it a direct upgrade when space is tight or weight must be reduced. The jump is worth it when a lighter, shorter valve simplifies support structures and speeds up installation. Steam service is not rated, so the valve stays in water or compatible liquid applications only.

Fits Between Standard Flanges

The valve needs mating flanges with the same nominal diameter and compatible bolting pattern to seal correctly. It frees up the straight pipe length and hanger spacing that a conventional swing check would consume. No external actuator or power source is required because the internal spring closes the discs automatically when flow stops.

Highlights

  • Prevents backflow with double-disc wafer design
  • Cast iron body handles 200 psi at 150 Degrees F
  • Operates up to 100 Degrees F in process piping
  • 316 stainless steel spring resists corrosion
  • Buna-N seals suit horizontal or vertical mounting

Specifications

BrandMUELLER STEAM SPECIALTY
TypeOther

Questions about this item

What pipe size and flange connection does the 4 inch wafer check valve require?

It fits a 4 in pipe with flanged wafer connections on both ends, so the mating flanges must match that pattern.

How do I orient the valve during installation, and what is the common mistake?

Mount it horizontally or vertically with flow in the direction of the arrow; the frequent error is installing it backwards so the discs cannot open.

When should I plan to replace the Buna-N seats and seals?

Replace them if they harden, crack, or leak after prolonged exposure near the 100 Degrees F temperature limit or 200 psi water pressure.

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