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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 P&ID is a detailed diagram in the process industry that shows process equipment and the instrumentation and control devices. It is also called as mechanical flow diagram (MFD) and has a standard set of symbols based on ISA and ISO standards.
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.
ISO 14617 is a library of graphical symbols for diagrams used in technical applications. It consists of 15 parts, covering various types and applications of devices and functions, and is developed in cooperation with IEC 60617.
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.
AOL Mail offers features like news, weather, security and spam-blocking for free. You can sign up for an AOL account and access your email on the go with an app or on the web.
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.
Learn how to troubleshoot common issues with your AOL Mail, such as missing, delayed, or blocked messages, image attachments, and filters. Find out how to contact AOL Customer Care for live support if you need more help.