quick question: diff between check valves

[dynomo]

guys, its bout that time again i suppose:

whats the difference between a single check valve and a double:

 

[Lagerkhan]

They do what they say

 

[dynomo]

so to be safe, wack a double one in???

 

[Slugbabydotcom]

so to be safe, wack a double one in???

Double check valves are to prevent contamination of mains water.

Where are you proposing to use it?

 

[dynomo]

need to connect just after the stop cock, i.e. on the mains water

 

[Lagerkhan]

need to connect just after the stop cock, i.e. on the mains water

Read this and make your own mind up
http://en.wikipedia.org/wiki/Double_check_valve

 

[BoxBasher]

d'oh, replied to wrong post

 

[Bahco]

Single check is for low pressure systems and double is for mains water pressure.

 

[BoxBasher]

Single check is for low pressure systems and double is for mains water pressure.

Not quite right there... It's determined by the fluid category risk downstream.

 

[Bahco]

It's determined by the fluid category risk downstream

Tell me more please

 

[BoxBasher]

It's determined by the fluid category risk downstream

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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