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1550 Reduced Pressure Principle Device - Plumbing - Distribution Piping in the House
 
1550 Reduced Pressure Principle Device - Plumbing - Distribution Piping in the House -

Image Text: Normal operation > Water > upstream valve > primary check (open) > water flow > atmospheric vent (closed) > secondary check (open) > downstream valve > Water > Backflow condition > primary check (closed) > atmospheric vent (open) > any residual water is discharged through vent port > secondary check (closed) > water > Water > Note: mechanism simplified for clarity

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Image courtesy of Carson Dunlop. To purchase images, go to CarsonDunlop

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