GA Figure 991:

Vacuum Breaking Valve for Sewage, Weight Loaded

Size: 3" to 8"
Valve Type: Air Valve
Fluid: 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.

Characteristics
  • 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
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
Corrosion Protection
  • 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
Downloads
Drawings and Parts List
Fig 991 Drawing EAV7060-B
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Installation, Maintenance and Operating Instructions
Fig 991 O&M 051022
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Product Bulletin
Air Valve Bulletin VAG16 LR
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Sample Specification
Vacuum Breaking Valve Rev B
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Technical Datasheet
Air Valve Sizing For Pipeline Filling and Draining
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Figure 991 Data Sheet 991-01B
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Clean Water

Dependable valves that meet your clean water needs

From the raw water intake to the filtration plant to the finished waster distribution and storage system, GA Industries valves have been providing dependable service in large and small water systems. GA Industries pump control, check and relief valves mitigate damaging pressure surges and eliminate slam and bang that can result from the operation of water pumps.

Our full range of pilot operated control valves regulate distribution system pressure and prevent overflow of storage tanks and reservoirs. Air trapped in water pipelines can reduce system efficiency and exacerbate pressure surges. Our wide range of automatic air valves ensures we have the right valve to maintain an air free system.

And when it’s necessary to isolate a pump, process or section of pipeline, you can depend on GA Industries butterfly valves for reliable flow shutoff.

GA Figure 991:
Vacuum Breaking Valve for Sewage, Weight Loaded
GA Figure 991 Image
Size: 3" to 8"
Valve Type: Air Valve
Fluid: Water

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