RPZ Valves (Backflow Preventer)

PROTECTING DRINKING WATER NETWORKS

Why and against what risks ?

WATER is the most precious of our natural resources, source of life and health, today we use water for multiple needs.
Whatever its destination – domestic, urban, agricultural or industrial, the water we use every day is distributed by interlinking    networks of pipelines which are becoming more and more complex. The risk of pollution by “backflow” is always present.

 

 

BY SIPHONING OR OVERPRESSURE

Backflow may occur when the usual direction in the distribution circuit is reversed.  This return may draw water the backflow. The risk of pollution is even greater when the different pipeline networks are closely linked.

The risks from the occurrence of backflow are more or less serious depending upon how “dangerous” the fluids which could have come into contact are.  The choice of protection systems and devices, more or less sophisticated, should be made according to the presence of more or less ”dangerous” fluids.  Today different European standards, currently being harmonised, govern these choices.

PROTECTION SYSTEMS FOR DRINKING WATER NETWORKS …

Agriculture, chemical or agricultural industries, collective or individual housing, workshop or business, all kinds of user are served by and linked to the same network : the risks of telescoping multiply.

As the network becomes more and more complex, an incident is more and more likely to occur in the water distribution system. Incidents may occur of various degrees of seriousness when pumping a polluted liquid, siphoning a tank of chemical product, disposing of a dangerous product or rejecting waste water.

PROTECTION – SOLUTIONS

A BA backflow preventer protects the drinking water network by interrupting the   continuity of the supply to the user, emptying and evacuating to waste in case   of danger of water being turned back into the main pipeline.

BABM

The two check valves are open; the discharge valve is held closed by the dominant upstream pressure pushing the membrane from above. The downstream installation is served.

BA4760

The two check valves are closed and the discharge valve is closed by the   positive differential pressure pushing down on the membrane. The downstream installation is no longer served.


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