Q. WHAT IS THE DIFFERENCE BETWEEN A CHECK VALVE (CV) AND A NON-RETURN VALVE (NRV)?

A.  A check valve is specific type of valve which can prevent backflow from occurring. It has to be tested and meet very strict criteria, which ensures fluids are not able to be siphoned back into drinking water systems.

Non-return valves, often similar in design to check valves, are not able to meet this strict criteria.

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