what is the diffrence between NRV and check valve?

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14 years 4 months ago - 14 years 4 months ago #7681 by KARTHIK
what is the diffrence between NRV and check valve.

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14 years 4 months ago - 14 years 4 months ago #5426 by Crashtested
Karthik take a look at this link here for a good explination - www.flosteer.com/checkvalves.htm

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14 years 4 months ago - 14 years 4 months ago #5427 by Jop
Most of the difference is in the economy of words (or letters) in the Bill of Material (BOM) along with the complexity of the installation.

A Check Valve prevents back flow.

A Non-Return Valve (NRV) prevents back flow.

A Back Flow Preventer prevents back flow.

Many of the Back Flow Preventer (or NRV) installations in Fire Water and Domestic water have double Check Valves plus both upstream and downstream block valves.

Do it once and Do it Right

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