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The second is a check valve that prevents the solution from traveling back up.—Bestreviews, Mercury News, 17 Feb. 2026 The skin check valve is meant to be inspected every 24 months according to the manufacturer, where it is removed, checked and reinstalled accordingly.—Marina Watts, PEOPLE, 26 Jan. 2026 The plumber can check if there are fixable issues with the switch, check valve, and drainage pipe.—Brandee Gruener, Southern Living, 17 Oct. 2025 Install check valves to prevent floodwater from backing up your home's drains.—Maria Sabella, Better Homes & Gardens, 7 Aug. 2024 See All Example Sentences for check valve