[C38] Vented loop for head discharge

[Don Strong]

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] *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 <mailto: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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