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A 3-inch Non-Return Valve (NRV) is a one-way valve that allows fluid (liquid or gas) to flow in only one direction through a 3-inch (approx. 80mm NB) pipe. It's commonly used to prevent backflow in pumping and pipeline systems.What is a Non-Return Valve (NRV)? Types, Working, and Symbols of NRVWritten by Anup Kumar Deyin Piping Design Basics

A non-return valve is a single-way valve that allows the fluid to flow only in one direction. The main importance of non-return valves is their working of allowing flow in the downstream direction and preventing the flow in the upstream direction. In this article, we will briefly learn about non-return valves, their types, functions, working, uses, and symbols.

Non-return valves are also known as NRVs. They are usually small, simple, and inexpensive. There are various types of non-return valves but the main function is the same. They are also known as one-way valves, check valves, clack valves, reflux valves, or retention valves. In the year 1907 Frank P Cotter developed the first simple model of a non-return valve.

Non-return valves find a range of applications in industrial and domestic sectors. Some of the uses of nonreturn valves are:

• Pump Discharge: A non-return valve known as a check valve is always installed at the pump discharge piping to prevent the backflow of the fluid.
• Transportation Fluid System: Transportation fluid systems use non-return valves in their pipelines to avoid the backward movement of the fluid.
• Nuclear Industry: Nitrogen feed systems, dump lines.
• Industrial Sampling systems
• Fluid Injection Systems of aircraft, spacecraft
• Laboratory Purification system
• Mixing chambers: A non-return valve is installed at each individual line to avoid gas mixing with the original source.

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