Kitchen Sink - Smells From Sink

[MGBV8]

From time to time I get a 'drain' smell from my kitchen sink (1 and a half bowl) when the washing machine is running.
It seems that when the washing machine is discharging vacuum occurs and sucks all the water out of the kitchen trap. When we run water into the sink to reseal the trap the smell subsides.
I have disconnected all the waste plumbing to check for blockages etc and everything is clean.
We have the washing machine waste and dishwasher waste connected into a combi outlet which is fitted above the main sink bowl trap.
We have no problems when using the dishwasher or the kitchen sink bowls.
I have seen an anti-syphon valve that can be fitted to the flexi washing machine waste - will this fix my problem?
I had wondered if it might be better to run the wastes from the dishwasher and wash machine after the kitchen sink trap - would this be better?

Sorry for the long first post
Any advice would be appreciated.

 

[kay-jay]

fit a standpipe appliance type trap for washer and dishwasher down stream of the sink. this may alleviate the problem in itself but if it persists fit an anti syphon sink trap.

KJ

 

[MGBV8]

Hey - Thanks
Have not got much space to fit a standpipe type wash machine waste so was going to try one of these Washing Machine Anti Syphon Kit - Traps - Pipe & Waste -Tools, Electrical & Plumbing - Wickes
Would it do the trick?

 

[Dotty]

Should do. And at 4 squiddlies if it doesn't, you've not really thrown any money away.

 

[kay-jay]

yep.

be aware tho that the image in the link is misleading. it is only the valve that you get. the 2 connectors shown in the pic are not included.

KJ