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(NRV) Non-Return Valves | Check Valves - Symbol, Types and Importance

(NRV) Non Return Valve


A Non- Return Valves, check valve, clack valve, non- return valves, reflux valve, retention valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in one direction only.

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Non  - Return valve/ Check valve are two-port valves, meaning that they have two openings in the body, one to enter the fluid and the other to release the liquid.


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Types of (NRV) Non - Return Valves

There are various types of check valves/non-return valve used in a wide variety of applications.  Non- return valves are often part of common household items.  

Although they are available in a wide range of sizes and costs, Non - Return valve are generally very small, simple or inexpensive. Non - Return valve operate automatically and most are not controlled by an individual or any external control;  Accordingly, most have no valve handle or stem. The bodies (outer shells) of most  Non - Return valve/check valves are made of plastic or metal.

Importance Concepts in (NRV) Non - Return Valves

  An important concept in the Non - Return valve/check valve is the cracking pressure which is the minimum differential upstream pressure between the inlet and outlet at which the valve will operate.  Is usually designed for Non - Returnable valve/check valves and can therefore be specified for a specific cracking pressure.

  Heart valve are essentially inlet and outlet check valves for the ventricles of the heart, as the ventricles act as pumps.

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