Check Vents

[Leroy Eckert]

There is a sort of vacumn formed inside when the front window is opened and it
acts like the vent fans. It sucks inside air out. I had that happen once and
have since closed all the drains with their respective plugs before traveling
and have not had the problem since. I have yet to determine how the smell gets
through the water traps???I would understand if a trap was dry. Perhaps the
vacumn opens the check vents somehow?????

Leroy Eckert
1990WB-40"Smoke N Mirrors"
Niceville, FL
----- Original Message -----
From: Rob Robinson
To: WanderlodgeForum@yahoogroups.com
Sent: Sunday, May 27, 2007 12:06 PM
Subject: Re: [WanderlodgeForum] Check Vents


Thanks for that Pete. I think I might check out these vents to see if I have
a stuck one. I do sometimes get a smell when dumping the tanks and always if
I leave a window open as I'm going down the road.

On 27/05/07, Pete Masterson wrote:
>
> The whole point of the vent system in waste lines is that the moving
> water creates high/low air pressure in front and behind the 'blob' of
> water. Venting allows the air pressure to equalize, allowing the
> water to flow quickly and without 'glugging' as it moves down the pipes.
>
> Because of the way the pipes have to run in an RV (any RV, not just a
> BB), there are often under-sink vent valves as a (second or third)
> through-the-roof vent may be impractical. If properly installed, and
> not stuck open, the under-sink vents should not be allowing sewer gas
> from the tank(s) to enter the coach.
>
> The primary vent (to the tank) is designed to allow sewer gasses to
> escape and prevent a build up of pressure as well as to allow air to
> be displaced as water runs through the pipes... but there may be
> turns and drops in the run that isolate sections of pipe when they're
> filled with water, hence the need for an additional vent to relive
> the pressure differences.
>
> If you look at a piping diagram for a typical home, you'll see that
> there are multiple vent lines that often join together to minimize
> the number of through-the-roof vents -- but usually there are vents
> serving each 'set' of drain lines. For example, my home has a vent
> stack near the kitchen, another near the washing machine and laundry
> tub, and a third near the bathrooms (that are 'siamese-style' to
> share plumbing). This multiplicity of vents often isn't practical in
> an RV.
>
> Pete Masterson
> '95 Blue Bird Wanderlodge WBDA 42
> aeonix1@...
> On the road at Lockhart Texas
>
> On May 27, 2007, at 9:16 AM, jwasnewski wrote:
>
> > There is a check valve vent, normally closed, on the sewer system
> > under
> > each of my sinks. What is there purpose? The only thing I can come up
> > with is to relieve gas pressure and stink up the coach in the event of
> > an external roof vent becomes clogged??????Any ideas.
>
>
>

--
Rob, Sue & Merlin Robinson
94 WLWB

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