[C320-list] antisiphon valves

[Chris Burti]

It is my understanding that all factory mounted hardware is installed
at locations that are either internally reinforced, solid glass or
plate mounted.

On 7/8/07, harold brown <jbrown5093 at yahoo.com> wrote:
> Thanks for all the information on the valves. This
> list is invaluable to someone just beginning. Now
> another question.  My genoa winches are thru bolted
> but only have a small washer on the bolt. Is there a
> reinforcement plate in the glass and if not should one
> fit one over the bolts?  It seems like a lot of force
> on just 4 small washers. I understand the deck mounted
> winches are bolted into a threaded plate imbedded in
> the deck. Thanks. Jim Brown
> --- Scott Thompson <sthompson at toad.net> wrote:
>
> > The purpose is to to create a "vented loop" above
> > the water line in
> > order to prevent a siphon forming when the
> > associated system isn't in use.
> >
> > The vented loop in the cockpit locker is for the
> > engine cooling system
> > and is in a loop between the engine heat exchange
> > and the exhaust elbow.
> >   Without this vent it's possible that when you shut
> > down the engine,
> > cooling water could continue to flow due to siphon
> > action from the
> > exterior of the boat through the raw water pump and
> > heat exchanger into
> > the exhaust elbow and muffler.  Without pressure
> > from the engine exhaust
> > to clear the muffler, this could eventually cause
> > the muffler to fill
> > with water, possibly allowing water to back up
> > through the exhaust elbow
> > into the engine itself, which obviously is not a
> > good thing.
> >
> > The one for the head is intended to prevent flooding
> > the boat from water
> > siphoning through the head pump into the bowl and
> > overflowing.  The
> > other one in the head cabinet is for the shower sump
> > pump, where water
> > normally flows out of the boat, but could reverse
> > due to siphon action.
> >
> > Scott Thompson
> > Surprise, 653
> >
> > harold brown wrote:
> > > Thank for the information. Mine are now screwed
> > down
> > > tight they were all open (including the one for
> > the
> > > engine). Funny the owner's manual maken no mention
> > of
> > > it. What is the purpose of having the vented valve
> > in
> > > the first place? Jim Brown
> > > --- Quentin Murphy <qmurphy at sympatico.ca> wrote:
> > >
> > >> These should be screwed tight.  Some 320s also
> > have
> > >> another anti-siphon
> > >> valve (engine) in the main cockpit locker.  Mine
> > >> loosened last year and
> > >> caused the aft cabin berth (including the
> > bedding)
> > >> to get a good soaking.
> > >> It took months to get the space under the locker
> > dry
> > >> and every time the boat
> > >> heeled, it re-wetted the berth.  Not too
> > pleasant!
> > >>
> > >> Quentin Murphy
> > >> Celtic Knot #667
> > >>
> > >> -----Original Message-----
> > >> From: c320-list-bounces at catalina320.com
> > >> [mailto:c320-list-bounces at catalina320.com]On
> > Behalf
> > >> Of harold brown
> > >> Sent: July 4, 2007 3:45 PM
> > >> To: c320-list at catalina320.com
> > >> Subject: [C320-list] antisiphon valves
> > >>
> > >>
> > >> Probably a dumb question but are the screw down
> > caps
> > >> on the 2 antisiphon valves in the head cabinet
> > >> supposed to be screwed down or left partially
> > open?
> > >> Jim Brown     Desafinado
> > >>
> > >>
> > >>
> > >>
> > >
> >
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> > >
> > >
> > >
> > >
> >
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> > >
> >
> >
>
>
>
>
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-- 
Chris Burti
Farmville, NC