Sink vacuum problems, not draining..any help is great

[Brynlondon]

Sorry, probably been asked a thousand times and if so please direct me to right place!

But...I am in the process of completely rebuilding our kitchen yet have been unstuck by something as simple as a sink which gets vacuum locked...? The water trap is this contraption from Ikea and has caused no end of trouble.

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• Brynlondon
• 4 Jul 2008
• 1

As per usual with these problems, huge airbubbles try and rush up the waste pipe when the plug is let out, and the water runs just fine for about 2 seconds, then it slows to the point that the water is nothing more than a trickle and barely leaving the sink.

The wmc plugs straight into an airtight pipe on LHS of bottle trap, overflow from sink into RHS, but the water just doesn't want to budge.

Any ideas what to do here? Do i bin the whole system and just build a new trap myself with smaller diametre pipes to reduce the vacuum/ syphon effect or fit some sort of AAV, and if so where, waste side of the trap and what sort of AAV can anyone recommend?

Sorry, i bet this has been covered before but any hep would be great, slowing down the rest of the work no end...and the wife is nagging about not having a washing machine!

 

[seco services]

i never use the ikea wastes i always opt for a new p trap with washing mashine oulet.

http://www.ultimatehandyman.co.uk/waste pipe with spigot trap.jpg

that will connect straight up to your 40mm waste pipe.

 

[Brynlondon]

Cheers for that but i would have put the overflow into the small brach at the top of the waste pipe not the washing machine, is that not right?

The system before had a T splitting from the bottom waste pipe. LHS went off to a u-bend and standpipe (not airtight) for the washing machine. RHS went up to bottle trap which had a "silentvent" attached. the previous house owner had also drilled holes in the top of the pipe just after the trap so i presume this vacuum problem is not new...

 

[seco services]

can you not use a p trap with two washing machine outlets then you can connect your overflow/w machine.

 

[Brynlondon]

Sounds like a plan thanks, but will this get around the problem of the vacuum? fitting the washing machine in airtight seems to be wrong to me, but i really don't know that much about plumbing at all!

Given the last system has this "Silentvent" piece do i need to work something like that is to deal with the vacuum?

 

[seco services]

that set up sounds a bit strange.
have you any pics of what its like i can't quite picture it.
i try to avoid bottle traps on sinks.

 

[Brynlondon]

Will do my bestto get some pictures of the old and the new set up on here soon, in the mean time anyone who can tell me about AAV's and how they wold work under a sink would be great.

Thanks, Seco, lots of help