GA Figure 991 Vacuum Breaking Valve for Sewage, Weight Loaded

3” to 8”

Productgroup: Air Valves

Medium: Water

GA industries Figure 991-D Vacuum Breaking Valves are specially designed for use with sewage and other solids bearing fluids. The valve design does not have spokes or springs exposed to the fluid that could collect debris and stringy solids.  

The large orifice valve opens to rapidly admit air into the pipeline or system during negative pressure conditions such as column separation to limit the vacuum and then closes when the pressure recovers to atmospheric.  

The valve is standard 3” to 8” sizes with Class 125 flanged connection.  Larger sizes and higher pressures are available.

  • Specially designed modified swing check with outside lever & counterweight
  • Adjustable counterweight position determines opening pressure 
  • No spokes or springs to collect solids
  • Air inlet with hood and screen to minimize entry of foreign material
  • Valve Body: Cast Iron
  • Body Seat: Type 316 Stainless Steel 
  • Disc Seat: Buna-N Rubber
  • Shaft: Type 303 Stainless Steel
  • Cover Fasteners: Zinc Plated Steel
  • Standard: Uncoated internal, external coated with enamel primer, minimum 2 mil DFT
  • Optional: 316 SS external fasteners and internal and external NSF-61 certified 2-part epoxy, minimum 6 mil DFT
Drawing and Parts List
Figure 991 EAV-7060
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Product Bulletin
Air Valve Bulletin
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Sample Specification
Vacuum Breaking Valve
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Technical datasheet
Technical Data Sheet GA-991.01
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9025 Marshall Road
Cranberry Township, PA 16066
United States
Phone: +1 724-776-1020

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