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1549 Double Check Valve Assembly - Plumbing - Distribution Piping in the House
 
1549 Double Check Valve Assembly - Plumbing - Distribution Piping in the House -

Image Text: Normal operation > Water > upstream valve > check valve (open) > water flow > check valve (open) > downstream valve > Water > Backflow condition > check valve (closed) > water > check valve (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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