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| Backflow Certification |
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 Why periodic inspection and testing of Backflow preventer? |
| Because water is a corrosive and erosive medium. As such, mechanical devices placed in water are subject to adverse conditions. High pressure, alkalinity, temperature, acidity and other conditions take their toll against hinged pins, springs, rubber or plastic parts, and even brass seats. The only way to know when repairs are necessary, other than by obvious failure of the device, is by periodic inspection. Test cocks are installed in all units that require inspection solely for the purpose of testing. Testing ensures that it continues to operate properly and serve the purpose for which it was installed |
| Nature of the Test |
The important criteria of backflow prevention device testing, depending on the device type, are
- To ensure that check valves prevent backflow.
- To ensure that air ports pop open when they should.
- To ensure that relief valves open before the pressure in the zone between the check valves is less than 2 psl below the pressure at the inlet to the device.
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