[C38] Vented loop for head discharge

[Max Soto]

Steve, Don is right, sounds like your jocker valve is gone.... Good thing
is that they are very cheap and easy to replace. Not a nice job, but easy!
Max

2011/11/1 Don Strong <drstrong at ucdavis.edu>

>  Steve: Yes. Twice in 10 years we have had leakage. I fixed the leakage
> with a new joker valve both times. After the second replacement, a friend
> told me that the joker valve will last lots longer if it doesn't soak in
> chemical. I think that his argument is reasonable, and I have stopped
> leaving deodorant in the head between sails. Rather, I flush a cup of fresh
> water on "dry bowl" before leaving the boat.
> Don
>
>
> On 11/1/11 8:36 AM, Steve Smolinske wrote:
>
>  Right, I know the loop breaks the siphon, the question is has anyone had
> a problem with the black water that is always present from the head to the
> loop ever leaking back past the duckbill and flapper valves and filling the
> head, similar to how the bowl fills if you don’t have a loop and leave the
> seacock open.,   Thanks****
>
> ** **
>
> *From:* listserve-bounces at catalina38.org [
> mailto:listserve-bounces at catalina38.org <listserve-bounces at catalina38.org>]
> *On Behalf Of *Max Soto
> *Sent:* Tuesday, November 01, 2011 7:44 AM
> *To:* Catalina 38 Listserve
> *Subject:* Re: [C38] Vented loop for head discharge****
>
> ** **
>
> Steve,  Since the loop+vent breaks the siphon, the "pressure" on the joker
> valve is from the grey water located between the head and the loop.****
>
> Don, same thing happened to the PO, so he made a box that raises the head
> about 7 inches, and added a vented loop to the intake hose.  Apparently he
> found he boat with 1' of water. I think that the vented loop for the intake
>  is enough, so I'm going to remove the riser box. Short people have their
> feet on the air while seating in the head! ****
>
> ** **
>
> Regards,****
>
> ** **
>
> Max****
>
> 2011/11/1 Don Strong <drstrong at ucdavis.edu>****
>
> Steve: I did the vented loop head-to sea retrofit because my insurer
> demanded it.  Big job! The exit hose goes up the along the hull, through
> the sink top and reaches an apex are just under the deck. The vent is at
> the apex. The loop+vent breaks the siphon. I don't see how the grey water
> problem is any different between "overboard" and "waste tank." When the
> valve is thrown to tank, grey water sits behind the joker valve just as it
> does when the valve is thrown to overboard.
>
> I also installed a vented loop for the sea water intake for the head after
> we awoke with 6" of water in the boat (someone "moi?" was too sleepy to
> flip the switch to "dry bowl during the night).  There is also a vented
> loop on the sea water intake for engine cooling. I recently replaced the
> vent.
> Don****
>
>
>
> On 10/31/11 11:43 PM, Steve Smolinske wrote: ****
>
>  Question for anyone with a vented loop in their head discharge.
> Looking at it on paper it seems that the pressure of the grey water in the
> section from the head to the vented loop would be enough to leak back into
> the toilet bowl.  I know there is a duckbill valve and a flapper valve in
> the head to stop the reverse flow, but as we all know if you leave the
> discharge seacock open the head will fill up.   Does the vented loop work
> because the head pressure of the grey water in the run from head to loop is
> not as great as that coming from the seacock?  Any experiences are greatly
> appreciated.   Thanks****
>
>  ****
>
> Steve****
>
> ** **
>
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> ****
>
> -- ****
>
> Donald R. Strong****
>
> Professor****
>
> Dept. of Evolution and Ecology****
>
> University of California, Davis 95616****
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> ** **
>
> --
> Max Soto
> C38 #198 ESTANCIA
> Puntarenas, Costa Rica****
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> --
> Donald R. Strong
> Professor
> Dept. of Evolution and Ecology
> University of California, Davis 95616
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-- 
Max Soto
C38 #198 ESTANCIA
Puntarenas, Costa Rica
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