Anti Siphon Loop Squirts Water???

Richard10002

Richard10002

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having sorted out the rusty shower pump problem, I still find water leaking in the area - having eliminated shower pump, Toilet inlet pipe filter joints, and other stuff in the area, I had a look at the toilet inlet pipe anti siphon loop and pumped the loo - water squirts out of the top of the loop, (the valve I guess). It then runs down the hull and collects in the area around the shower pump!!

before I start messing about, or replacing the loop, are there any possible simple solutions e.g. poke a wire down it to free the valve, unscrew the valve and give it a clean, (havent even checked if it unscrews), and so on.

I ask because anything I do intuitively will inevitably cock something up /forums/images/graemlins/smile.gif
 
Well I suppose stuck open is the failsafe option!
I presume you're not talking about a Lavac which should only be sucking.
Is the installation below water level?
 
The simple ones have a small rubber flap, more sophisticated ones have a spring. You should be able to unscrew the valve and wash in warm water. Personally I prefer the type without a valve but which has a connection for a small diameter pipe that you run to the deck somewhere.
 
Just possible, if it's a duck bill valve, it's been mounted back to front, letting water out at the end of the suck stroke (inertia pressure) and not letting air in.

Far more likely is that the valve has calcium deposits keeping it open. Makes pumping slightly less efficient, and wets your floor at the end of the stroke. Mending it? Most types unscrew from the U-bend and can be cleaned off with hydrochloric acid.

Unscrewing, if it's in an unaccessible place, is an invitation to drop the valve's gizmos (spring or duck valve) down into inaccessible parts of the bilge. Don't ask. Develop a strategy to handle that!
 
I have had the prob Richard, mine was just a screw off "nut" thing on top of the bend with a rubber disc inside that seated and sealed on the sucktion stroke, probably salt or dirt on the seat/disk.
 
I have had the prob Richard, mine was just a screw off "nut" thing, with a hole in the top of it, on top of the bend with a rubber disc inside that seated and sealed on the sucktion stroke, probably salt or dirt on the seat/disk.
 
[ QUOTE ]
I have had the prob Richard, mine was just a screw off "nut" thing, with a hole in the top of it, on top of the bend with a rubber disc inside that seated and sealed on the sucktion stroke, probably salt or dirt on the seat/disk.

[/ QUOTE ]

I've unscrewed the nut thing off the top of the bend, but there is no disc inside, (and I'm pretty sure I havent dropped it). Cant see what's underneath, but there seems to be a slot or a hole, and there doesnt seem to be a flap - tried poking a blunt metal prodder in, but felt nothing, and no change.

Perhaps it's been off before, and the disc has gone - wonder if you can get new nut things with the disc?

Thanks to all - got an idea how it works now, even if I have to fit a new one.... and that will be bloody awkward!!

Richard
 
Sounds like someone has been at it and lost the disk. Maybe you can make another, or if it,s a "whale" part they could send one. Have a look at their product list for one that looks the same. If you make one, be sure it,s loose enough to open and release the vac.
 
It's got R. C. Marine on it... presumably from when the boat was built between 1993 and 1995. Cant find R. C. Marine with a Google search, and could guess that they have been bought by someone else - possibly whale, but cant find anti syphon loops on the whale.com or whale.co.uk sites

What would I make one out of?

Thanks for the help

Richard
 
Richard can you consider putting a nipple on the loop and connecting small bore hose to it which exits the boat through a small fitting just under the gunwhale. These valves are notorious for not being 100%.
 
I have to confess Richard, I cannot say what to use with out seeing the unit, it would probably be like a water tank ball valve washer, (or even a ball). Sorry I can,t help more, i,ve a Lavac so can,t even look! The one I had probs with was a rubber disc though. But whatever you do, don,t prevent the syphon breaking action, the drip is better than no syphon break!!! Bill.
 
John,

cant see me doing that .... finding the right nipple, ( /forums/images/graemlins/blush.gif ), fitting it, finding and fitting small bore hose, drilling hole under gunwhale, fitting a fitting ..... dont feel comfortable with any of it, so would be more inclined to buy a new loop and break my wrists fitting it /forums/images/graemlins/smile.gif
 
[ QUOTE ]
(or even a ball).

But whatever you do, don,t prevent the syphon breaking action, the drip is better than no syphon break!!! Bill.

[/ QUOTE ]

You never know, I might see a tiny ball on my travels, or there might be one somewhere on board.

I wont prevent the break, and will probably avoid using the loo until it's sorted.

Cheers
 
Having decided that I could use the forward loo, I realised that it would also have a syphon loop, so took the nut off, and found a tiny cylinder with a bit of a prong on the end - put it back in the aft loo, which is the one we use mostly, and where I want to cure the leak. I also think it will be easier to replace the syphon loop in the forward heads.

I'm sure a little ball would do the trick, but I'll see what I can find.
 
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