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A double check valve is a device that prevents water supplies from contamination by backflow. It consists of two check valves in series and is suitable for low hazard applications such as irrigation and fire sprinkler systems.
A check valve, also known as a non-return valve, is a valve that allows fluid to flow in one direction only. Learn about the different types of check valves, such as ball, diaphragm, swing, butterfly, and stop valves, and their uses in pumps, industrial processes, and domestic devices.
A reduced pressure zone device (RPZD) is a type of backflow prevention device used to protect water supplies from contamination. It consists of two check valves and a relief valve that maintain a lower pressure zone between the water supply and the downstream system.
Learn how to access, manage, and troubleshoot your AOL Mail account as a Verizon customer. Find answers to common questions, tips, and support options for AOL Mail.
Reed valves are check valves that open and close under changing pressure, used in pumps, engines and musical instruments. Learn about their history, types, performance and modelling in this Wikipedia article.
AOL Mail offers secure and personalized email with features like AOL Mail, news, and weather for free. You can also access your email on the go with an iOS & Android app and get help from experts.
Find answers to common questions and issues about AOL Mail, such as how to create a signature, add images, fix errors, and more. Get live chat or phone support from AOL experts or browse the articles and tutorials for help.
A duckbill valve is a check valve with a rubber or elastomer flap shaped like a duck's beak. It is used in medical and marine applications to prevent backflow of fluid.