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Thanks for the clarification. I can see how it would help keeping units downstream of the manifold primed. A54 (at least ours, but I believe all) have a check valve in front of the anchor wash pump, although it’s prone to clogging open and fail, like I described in post
Incidentally, it has failed again a few months after I had cleaned it, so I probably need to change it. The symptoms (squirting in the cockpit drain) reappeared and I resorted to grey tape the anchor wash outlet as a temporary measure, which stopped the squirting immediately.
Having said that, your device doesn’t help purging out air accumulated in the seachest through the thruhull, because of air bubbles or a deep roll while sailing. That accumulated air still needs to be evacuated through the raw water consumers. On the A54 the fridge circulation pump usually does that job.
Huahine, French Polynesia
On 10 Apr 2021, at 01:53, CW Bill Rouse <brouse@...
That brass one-valve was not original.
On Fri, Apr 9, 2021, 10:48 PM Mark Erdos <mcerdos@...
I have a one-way flap valve between the manifold and the
sea-chest/strainer. It is not possible for water to easily flow backward toward
the sea-chest even if the engine or genset pulls water faster than the strainer
can provide (if dirty). This ensures my pumps for AC, water makers and heads
remain primed and I get no air in the sea-chest. The original was brass and I
upgraded to stainless when I rebuilt the manifold.
- Cream Puff - SM2K - #275
cruising - Tahiti, French Polynesia
certainly suck air into the strainer because the suction from various pumps
would overcome a one-way valve. All of the one-way valves I am familiar with
for water do not work well for air.
I am not
sure what Mark is talking about because the sea chest contains the
Can you expand on that idea? I don’t really see where that
valve would be?
What do you think of a hose out of the Vetus lid, up over
the water line and outputting in the cockpit drain (which is very nearby on the
A54), with a one way valve to let accumulated air out into the cockpit drain
but preventing any suction of air through there?
Raw water consumers would pump sea water through the chest
and strainer and any accumulated air (up to the waterline) would rejoin the
atmosphere by simple gravity.
Arguably, the rolling motion of the boat would continuously
fill that one-way hose with sea water until it overflows in the drain. Also,
removing the vetus lid for maintenance of he sea chest would be messier, having
to deal with the water left in the hose. Maybe a Gardena type adapter to easily
remove the hose from the lid even if it’s full. The same fitting could be used
to feed the system fresh water for wintering like Arno did.
Huahine, French Polynesia
On Sun, 29 Nov 2020 at 11:28, Mark Erdos <mcerdos@...>
The most effective way I have found to prevent air accumulation
in the strainer it to install a one-way flow valve between the strainer and the
With best regards,
Sailing Vessel - Cream Puff - SM2K -
Currently cruising - Tahiti, French