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Discuss High Flow Double Check Valves in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Marc Bowers

Gas Engineer
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50
Hi all, I’ve a customer with a failed double check valve on a water softener, it’s 22mm compression but with a far larger bore than the usual DCV’s you see online. Anyone know if they are called something different or where I can get one? I’ve even been on the water softener website and they don’t seem to sell them. Ta.
 
You sure it’s not a 28mm dcv threaded end eg 1”-22mm male irons
 
That’s what I normally do

Another option is a swing check valve have to be installed horizontally tho
 
Is it the attached per chance?
 

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It’s not, but that’s the first one I’ve seen rated as high flow. What’s the web address?
It's an RWC branded valve.

Jet do the attached variant too.
 

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Dear Marc, how did you identify the failed double check valve on a water softener? The inlet to our Harvey's softener has been making a clunking noise intermittently for 5 days now. Could it be the same problem as yours? Thanks so much for reply Sara
 
Dear Marc, how did you identify the failed double check valve on a water softener? The inlet to our Harvey's softener has been making a clunking noise intermittently for 5 days now. Could it be the same problem as yours? Thanks so much for reply Sara
My problem was flow rate. A clunking noise is usually water hammer and can have a number of sources (not necessarily in the area of the noise)
 

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