quick question: diff between check valves
- Thread starter dynomo
- Start date
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dynomo said:
Double check valves are to prevent contamination of mains water.
Where are you proposing to use it?
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Single check is for low pressure systems and double is for mains water pressure. 
Tell me more please
Bahco said:
Tell me more please
You asked for it...
Single check suitable for Fluid Category 2 (slight aesthetic changes to water quality due to change in temp or presence of substances or organisms causing change in taste/appearance)
Double check valve suitable for Fluid Category 3 (represents a slight health hazard because of the concentration of substances of low toxicity eg lawn feed/fertilizer, central heating additives etc)
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