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Old 17-12-2017, 20:36   #1
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Boat: Beneteau Sense 50
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Removing anti-syphon valve

I have a Beneteau Sense 50 with an Onan 6KW genset. Twice this past season, the raw water impeller destroyed itself after ~30-40 hours of use. On both occasions I found a very large amount of seaweed stuck in the anti-syphon valve that is located about 18" from the sea water thru hull. Given that the thru hull is only inches from midline, I don't understand the necessity of keeping it.
Anyone have a similar setup and chosen to remove the anti-syphon valve?
Thanks
Jose
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Old 17-12-2017, 20:51   #2
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Re: Removing anti-syphon valve

Without seeing a detailed layout with elevations from intake to exhaust the question is not possible to answer...

The best anti-syphon arrangement is to just use a tee off the water line, and connect a small diameter hose to a place it can safely overflow. I always liked to do this over a cockpit drain so I can see the water flow.

If you are clogging with seaweed... you do have a strainer on the intake? Yes?
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Old 17-12-2017, 21:04   #3
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Re: Removing anti-syphon valve

I do have a traditional strainer that is higher than the genset, and should be above waterline. This valve sit between thru hull and strainer
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Old 17-12-2017, 21:08   #4
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Re: Removing anti-syphon valve

That location is very, very odd for an anti-syphon valve. It would bleed air into the raw water line all the time when the pump was pulling water in.

Are you talking about a check valve?
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Old 17-12-2017, 21:15   #5
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Re: Removing anti-syphon valve

My mistake; It is a check valve, not anti-syphon. An absolute pain to disconnect and clean.
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Old 18-12-2017, 04:58   #6
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Re: Removing anti-syphon valve

OK, makes sense...

Most likely the reason you are having trouble with your generator impeller is that that cooling loop is draining, and it is starting up dry. I'll bet the check valve was added to try to prevent that, which of course it can not do if clogged open by seaweed.

So... do not REMOVE the check valve, but rather MOVE it to the downstream side of the strainer where it should have been to start with and see if you can fix two problems at the same time.
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Old 18-12-2017, 05:10   #7
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Re: Removing anti-syphon valve

I'll try that option first,
thanks for replies
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