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quick question: diff between check valves
- Thread starter dynomo
- Start date
dynomo said:
Double check valves are to prevent contamination of mains water.
Where are you proposing to use it?
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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