Anti syphon valve - should it stop "gurgling"?

[danb77]

Hi,

I'm a new homeowner and learning basic plumbing. I've just carried out my first successful piece of work - I replaced the smelly old sink trap in the kitchen with a new trap. No leaks (so far!), and I think I can count it as a success!

When I replaced the trap, I chose a McAlpine Trap with an Anti-syphon valve, as I thought, why not - I'll spend 10 quid extra from the 100 I just saved by not needing a plumber and treat myself to the valve!

I had the impression that anti-syphon traps would stop the trap making gurgling noises when the appliances drain, however, this has not happened. The appliances still gurgle when they drain. My question is, have I misunderstood what the anti-syphon trap should do (and the gurgling is normal) or could I have not set it up correctly?

Is there anything you need to do with a brand new anti-syphon trap to "activate" it?

In case it is relevant - here is the trap I bought - the WM11V

https://mcalpineplumbing.com/traps/...ccessories/wm11-sink-trap-twin-135deg-nozzles

Thanks in advance!

Dan

 

[jeff the gasman]

If it doesn’t stop gurgling yo probably have a blocked drain.

 

[danb77]

Thanks! The drain drains outside (yes - I know this is not good practice) and I can see the water flow out the pipe. It seems to flow out quickly without obstructions. Could there still be a blockage causing the gurgling?

I should add that the reason I replaced the trap is that the sink has been a bit smelly, and the bit of the drain that I cleaned when I replaced the trap (all I could reach) did have gunk in it.

If I wanted to clean the rest of the pipe (it bends) what equipment would I need? Happy to put the elbow grease in for a well functioning and gurgle and smell-free sink!

 

[danb77]

To add some more info, when I drain the sink now, it is pretty much gurgle-free. Only the appliances gurgle when they drain.

 

[Nige F]

Hi,

- the WM11V

https://mcalpineplumbing.com/traps/...ccessories/wm11-sink-trap-twin-135deg-nozzles

Thanks in advance!

Dan

That's a WM11 and I can't find a WM11V on their website

 

[danb77]

That's a WM11 and I can't find a WM11V on their website

The WM11V doesn't get its own page:
" Available as Anti-Syphon (Silentrap). Add suffix "V" to product code"

It's quite obscure. Wolseley were the only supplier I could find for it!

 

[Nige F]

OK fair enough - it's got the little air inlet standing up on the trap ? Then it should be anti syphon. Can you post a pic. of the installation.

 

[bobasd]

gurgling is more a venting issue not blockage.

post a photo of under the sink.
whats dischargin into the trap - a D/W an W/M? typicaly w/m's can sometimes cause gurling an a bit of foam at the waste but its no big eal.

sometimes fittin a AAV in a branch on the trap arm just before it goes into the wall will help.

 

[jeff the gasman]

If other appliances gurgle

gurgling is more a venting issue not blockage.

post a photo of under the sink.
whats dischargin into the trap - a D/W an W/M? typicaly w/m's can sometimes cause gurling an a bit of foam at the waste but its no big eal.

sometimes fittin a AAV in a branch on the trap arm just before it goes into the wall will help.

Will a blockage not cause siphoning then nowadays ?

 

[danb77]

Here it is! I'm quite proud of my handiwork!
https://postimg.cc/image/4jftsyhnh/


There are two appliances there, a Dishwasher and a Washing Machine. Both gurgle when draining.

Edit: The trap is basically the two-appliance version of this one: https://www.amazon.co.uk/Mcalpine-WM2V-Syphon-Horizontal-Nozzle/product-reviews/B016L1UZP6

 

[jeff the gasman]

Well, I’m pleased to tell you you are not a plumber.
Rotate the spigots 90 degrees and take the flexible hoses as high as possible in the cupboard and secure them. Then connect back onto the spigots.
Simples!

 

[danb77]

Thanks. That's useful advice.

Haha! I installed the spigots exactly as they with in the trap that I replaced!

By 90 degrees you mean that the spigots point left and right rather than forward and backwards?

I am aware that the waste hoses from the appliances are not well installed - there is no high loop - but to fix it I need to drill new holes in the kitchen units for the hoses - I can't secure them high as there is a silly butler sink in the way!

 

[jeff the gasman]

No mate I mean 180 I’ve had gin.x

 

[danb77]

OK - so spigots pointing upward? I've done that, and it still gurgles unfortunately!

Ah well. Looking forward to the day when I re-do the kitchen and can give the appliances their own pipes to the drain.

 

[jeff the gasman]

You have a blocked pipe then try sulphuric acid and follow the instructions carefully.
Available from plumbers merchants. You will need Id if you don’t have an account.
Be careful!