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PostPosted: Sat Aug 12, 2017 2:06 pm 
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I have just fitted a new ball valve to my hot water tank and I always thought that the new one would come with a submersion straw/tube to reduce the noise and splashing when it's filling up. But it hasn't. I did a bit of googling and nothing's come up. Is that not a thing? To me it just makes sense that they should be fitted. Anyone else has looked into it and came up with a solution? I measured the hole where the tube should go and it's about 12mm. Any ideas what I could stick in there?


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PostPosted: Sat Aug 12, 2017 2:34 pm 
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"Silencer tubes" are no longer permissible on ball valves AFAIK. There's a risk of back syphoning. There has to be a gap or "break" between the outlet and water surface.


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PostPosted: Sat Aug 12, 2017 2:59 pm 
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what's back-siphoning? I mean I get the general idea but can't quit figure out how it would work in this scenario or what the risk is.


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PostPosted: Sat Aug 12, 2017 3:04 pm 
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As I understand it, if you lose mains pressure you can end up with "negative pressure" in the mains, which will suck up water from the tank / cistern. Not really something you want.
I also think that they are not allowed by the water regulations, but I'm not a plumber. I expect one will be along in a minute.


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PostPosted: Sat Aug 12, 2017 3:08 pm 
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Maybe drilling a few holes above the water level would serve as a preventative measure?


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PostPosted: Sat Aug 12, 2017 3:45 pm 
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Torbeck ones still have this AFAIR

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PostPosted: Sat Aug 12, 2017 3:52 pm 
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gas4you wrote:
Torbeck ones still have this AFAIR


They have an anti syphoning valve in them don't they?

I think the OP is talking about the old brass "Portsmouth" type going by his other thread.


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PostPosted: Sat Aug 12, 2017 6:44 pm 
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I'm just looking for a solution. I know nothing about them, just had assumed they exist.


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