Tag:valve=check
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 valve = check
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| Description |
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Valves that are normally opened to let fluids go in a single direction over a given pressure and closed when it goes backward. Sometimes used as a safety device. 
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| Group: pipelines |
| Used on these elements |
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| Useful combination |
Status: approved
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| Tools for this tag |
A check valve is a particular kind of valve, normally opened to let fluids go in a single direction over a given pressure and closed when going backward.
They are sometimes used as a safety device to release abnormal pressure and prevent any kind of outside injection in the protected system.
It can be used in combination with outlet=valve when installed at the end of a duct to release fluid in open air environment.
Examples
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- | Such a protection, sometimes called a flap valve, prevents downstream floodwater to get in the underground drain. The flapper of the check valve only moves when upstream flow comes at enough level to raise the movable gate. |