Anti-syphon valves cleaning tips

tudorsailor

tudorsailor

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I have two anti-syphon valves in the engine room. One for the Yanmar engine and one for the genny.

I ought to clean/inspect them but have not done this before. How does each of them come apart? Any tips to avoid losing a vital bit in the engine bay?

Engine anti-syphon is
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The generator anti-syphon is this
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Thanks

TudorSailor
 
The engine one looks like a Vetus one ( older type) but difficult to tell from only small pictures.

If it is the top is held on by two small screws.

If the small pipe goes overboard or to a drain it may not actually have valve in it or if it does it may be possible to remove it. If no valve then it just needs cleaning together with the outlet pipe.

You will have to disconnect it from the plumbing and remove it from the wall I guess to work on it.


Dont know about the other one.
Unless access is good you may have to remove it to clean it. BUT undo the very top clip and pull out what should be the valve

It looks as though it has been capped by the yellow thing . I hope not!
 
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Ah
In abetter picture you can see one of the two little screws. And it has VETUS written on it!. No way of knowing if there is valve inside or not without opening it up

IMG_14491.jpg
 
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The manual and most boatie books say the anti-syphon should be changed every year. I have just been looking for one and the vetus ones are about 100 pounds ech for a little bit of plastic.
Has anyone ever found any problems withthese and do you change yours each year?
 
Nostrodamus said:
The manual and most boatie books say the anti-syphon should be changed every year. I have just been looking for one and the vetus ones are about 100 pounds ech for a little bit of plastic.
Has anyone ever found any problems withthese and do you change yours each year?
Click to expand...

Volvo manuals recommend a cleaning/checking/refurb interval but I dont recall seeing any mention of replacing the whole shooting match. Cant see the point.

Remove the valve bits and pieces to convert to the continuously peeing type. Problems all gone. Just check that they pee, like you do the outboard.
 
"make sure it pees", Mine pees into the cockpit, right into your shoe if you are helming on starboard. Don't know why it's that way but too much trouble to change.
 
Behome said:
"make sure it pees", Mine pees into the cockpit, right into your shoe if you are helming on starboard. Don't know why it's that way but too much trouble to change.
Click to expand...

What so that it pees into your shoe on port? Cant see that would be any advantage.
 
Nostrodamus said:
The manual and most boatie books say the anti-syphon should be changed every year. I have just been looking for one and the vetus ones are about 100 pounds ech for a little bit of plastic.
Has anyone ever found any problems withthese and do you change yours each year?
Click to expand...

Never seen that. As Vic says they should be checked periodically - the peeing type that the pipe is clear - but it is obvious if it is peeing, and the type that has a little flap valve in it cleaned because it can get salt deposits which affect its operation.

Otherwise last forever.
 
I am not quietsure where my peeing tube goes.
I presume I can take the small tube of the anti-syphon valve, start the engine and check it that way. You can buy a service kit (a small rubber valve which are 15 pounds each) but I seem to recollect that it means taking the anti-syphon valve off as they need to be put in whilst it is upside down.
I may be wrong, in fact it woul be nice for me to be right for a change.
My boat manufacturer sends out several memos a year on things to check or replace and suggest this should be done anually as water in the engine makes it pretty sick
 
I have tried to attach a pdf file from vetus site explaining what to do and how the vent works but it was impossible (it's 75Kb and don't know how to make it smaller). So, I have therefore copy paste the following:


Maintenance
With air vents without valve, check the air vent pipe regularly
for blockages.
With the air vent with valve, the following
maintenance should be carried out regularly:
Regularly remove salt, rust and dirt from all
valve components and from the valve housing
by rinsing out with clean water.
Remove the cap (1) in order to take the valve
out of the housing.
Spray the valve components with a Teflon
spray before refitting.
Check the valve operation (vacuum suction
on the air vent pipe connection) and the cap
sealing before returning to use.
 
cmedsailor said:
I have tried to attach a pdf file from vetus site explaining what to do and how the vent works but it was impossible (it's 75Kb and don't know how to make it smaller). So, I have therefore copy paste the following:


Maintenance
With air vents without valve, check the air vent pipe regularly
for blockages.
With the air vent with valve, the following
maintenance should be carried out regularly:
Regularly remove salt, rust and dirt from all
valve components and from the valve housing
by rinsing out with clean water.
Remove the cap (1) in order to take the valve
out of the housing.
Spray the valve components with a Teflon
spray before refitting.
Check the valve operation (vacuum suction
on the air vent pipe connection) and the cap
sealing before returning to use.
Click to expand...


Thank you for that. Is it possible to post the link?
 
If your valve is a Vetus you can identify it from pages 68/9 of the catalogue on www.vetus.com. This indicates which have valves and need servicing. The instructions for replacing the valve comes with the part, but no doubt it is somewhere on the website.

The things are pretty self explanatory when you take them apart.
 
snooks said:
You might want to read the learning curve in the September issue of Yachting Monthly when it comes out. We have a story about one that was blocked.
Click to expand...

A story about a blocked antisyphon valve. Wow . Look out Harry Potter
 
VicS said:
A story about a blocked antisyphon valve. Wow . Look out Harry Potter
Click to expand...

You know what excitement these little fellows generate here. Just think -

should they be in the pipe before the pump - or before the exhaust injection

do they have flap valves or not

do they pee or not - and where does the pee go

are they grey, black or blue (I have had them in all these colours - maybe there is a market for green ones as well!)

is it all magic anyway

Anybody who did not know what we were talking about might think they had entered a strange world.
 
Tranona said:
You know what excitement these little fellows generate here. Just think -

should they be in the pipe before the pump - or before the exhaust injection

do they have flap valves or not

do they pee or not - and where does the pee go

are they grey, black or blue (I have had them in all these colours - maybe there is a market for green ones as well!)

is it all magic anyway

Anybody who did not know what we were talking about might think they had entered a strange world.
Click to expand...

Mine is brown... could be the start of a whole new thread
 
Nostrodamus said:
Mine is brown... could be the start of a whole new thread
Click to expand...

Not seen a brown one before. See what I mean about an exciting subject - a voyage of discovery.

It may not, of course be made by Vetus, although they are the main supplier. Anyway I expect the inside will be the same as there are only a limited number of ways they can work.
 
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