Ball valves

[Isambard]

Can anyone tell me what the difference between 2 and 3 piece ball valves is? I can't see any problem with the 2 piece versions whereas the 3 piece just has 1 more seal to potentially fail. Plus there is a reasonable price difference. Is there any reason to use a 3 piece valve preferentially for spigots?

Additionally if anyone can recommend a supplier of cheap but quality plumbing bits I'd be grateful. Actual plumbers must use these things and I can't believe they're paying £30 plus for them.

Thanks.

 

[ManseMasher]

https://www.bes.co.uk/products/100.asp

Cheapest I've found.....

I use a 2 piece. 3 piece ok if you feel the need to take it apart for servicing etc but I personally am happy with the 2.

 

[Isambard]

Thanks. That makes a lot of sense.

 

[foxbat]

Cleaning is the reason. There's a void inside ball valves around the ball that should be clean and dry or you run the risk of organisms growing in the dark damp conditions.

3 piece valves are designed to come apart easily and do so. I believe 2 piece valves also come apart with some more effort.

Google "homebrew ball valve infection" for reasons why you want to make the quick task of cleaning them a regular routine.