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Old 16-05-2012, 22:57   #1
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Anti siphon questions

So I got around to attempting to install an anti siphon for our engine. The setup that I got is just basically a T fitting that sits between the heat exchanger and the injection elbow. I ran a line from the T up to the very top of the engine room and then connected it to a fitting that is right above one of the cockpit drains.

When I run the engine a lot of water shoots out the fitting. More than I thought it would be. I was wondering if this is okay? How much water is supposed to shoot out of the anti siphon?

I'm considering moving the point that the T fitting vents out of from the cockpit drain fitting to over the side. I have an unused through hull way up high near where the normal exhaust is. Anyone have input on this setup?
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Old 16-05-2012, 23:12   #2
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Re: Anti siphon questions

The anti-siphon is not supposed to shoot out water, but seal off the water under pressure and than allow air in without the pressure so the water can drain back to it's lowest level.

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Old 16-05-2012, 23:45   #3
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Re: Anti siphon questions

I might add; there is a little joker valve in the top of anti siphons. If it's missing or up side down, it will allow water to shoot out.
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Old 17-05-2012, 00:02   #4
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Re: Anti siphon questions

Those valves at the top of the antisiphon loop also tend to get plugged up with salt crystals. A 30 minute soak in a bath of white vinager will clean them right up.____Grant.
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Old 17-05-2012, 06:26   #5
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Re: Anti siphon questions

Delmarry, there are two distinct types of anti siphon device. One has a valve which is what you are referring to and the other has no valve. It does have a T piece that allows for full flow from the engine and a small hose that loops well above the waterline and goes down to either a small thru-hull or often points down to a cockpit drain. When this type is used you will get water running out of the small hose as a tell tale that shows that the raw water pump is pumping water.

The Vetus website shows both types and how to plumb it in.
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Old 17-05-2012, 06:46   #6
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Re: Anti siphon questions

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Originally Posted by gjordan View Post
Those valves at the top of the antisiphon loop also tend to get plugged up with salt crystals. A 30 minute soak in a bath of white vinager will clean them right up.____Grant.
The springs can also fail and the little pistons can seize. Even in fresh water. Ask me how I know this and why I won't be using them again.
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Old 17-05-2012, 07:47   #7
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Re: Anti siphon questions

It sounds like OP may have the type that simply vents to outboard/cockpit drain etc..

They spit water when they work. That's how we know they work.

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Old 17-05-2012, 08:45   #8
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Re: Anti siphon questions

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Originally Posted by NCboatrx View Post
Delmarry, there are two distinct types of anti siphon device. One has a valve which is what you are referring to and the other has no valve. It does have a T piece that allows for full flow from the engine and a small hose that loops well above the waterline and goes down to either a small thru-hull or often points down to a cockpit drain. When this type is used you will get water running out of the small hose as a tell tale that shows that the raw water pump is pumping water.

The Vetus website shows both types and how to plumb it in.
Stanley
If that be the case then why bother buying an expensive piece of plastic. Just put in a "T" fitting, for that hose size, with a hose leading out with a small restrictor/nozzle at the end.
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Old 17-05-2012, 08:52   #9
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Re: Anti siphon questions

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If that be the case then why bother buying an expensive piece of plastic. Just put in a "T" fitting, for that hose size, with a hose leading out with a small restrictor/nozzle at the end.
That's that. Some build, some buy.

When the one with membrane fails, it can be temporarily fixed by adding on a hose and removing the membrane.

b.
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Old 17-05-2012, 09:38   #10
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Re: Anti siphon questions

What I have is just a T fitting with a barb for the T that I have a hose connected to. There is no "valve" in the setup. Sounds like its normal for water to shoot out of it from your responses. I guess I'll just go over the side with it since it is bothering me in the cockpit.
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Old 17-05-2012, 14:57   #11
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Re: Anti siphon questions

When you have it to the cockpit drain you can see it si working when it spits. When you lead it overboard you must look now and then.

These things hardly ever clog if you clean yours routinely and take care so that the exit tube does not kink.

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