Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-12-2014, 11:28 AM   #1
Rivet Master
 
Wingeezer's Avatar
 
2005 30' Classic
Burlington , Ontario
Join Date: Sep 2008
Posts: 2,709
Inlet Check valve bypass

I have a drawing from Airstream showing the plumbing layout of a 31' trailer that someone passed on to me some time ago.

The drawing is dated 1997 - but updated to 2005 - I'm not really sure if it matches what is actually on my 2005 Classic 30, but it is probably pretty close.

In looking at the drawing today, I see there is a one way check valve on the city water inlet line - and I understand the need for that, i.e. so that you don't loose water out the city inlet when running from your fresh water tank and 12v pump.

However the check valve is shown with a manual bypass valve around it and i am wondering what the purpose of that would be?

The only thing I can think is that it may somehow be related to winterizing if you use plumbing antifreeze - i.e. a quick open/close of the bypass valve would flush out the city water inlet line.

But doing so could still leave a "slug" of water on the trailer side pipe leading away from the check valve which could perhaps not get diluted with antifreeze and could freeze.

I suppose the safest way to ensure the check valve is protected in winter is to both blow the system with compressed air, and then fill the system with antifreeze.

That is what I do most years, but a couple of times, I have winterized the trailer away from home with no access to a compressor so I just used plumbing antifreeze and still didn't encounter any freezing problems - maybe i was just lucky?

Anyone know if there is any other purpose for the check valve bypass valve?


Brian,

At least reviewing the plumbing schematic explains one thing to me. When winterizing our trailer, I had noticed one extra valve down in the general area of the three valves used to bypass the HW tank.

I always wondered what it was and I now suspect it must be the check gave bypass.
__________________
Brian & Connie Mitchell

2005 Classic 30'
Hensley Arrow / Centramatics
2008 GMC Sierra SLT 2500HD,4x4,Crew Cab, Diesel, Leer cap.
Wingeezer is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Water heater bypass valve Robfike General Motorhome Topics 6 05-11-2014 07:21 PM
Int'l 23D HW tank bypass valve location? DreamsInSlvr 2011 - 2015 International 2 09-17-2013 06:08 PM
Today gate valve, later check valve. GlenCoombe Classic Motorhomes 1 09-20-2005 12:02 PM
Bypass Valve tomb Water Heaters, Filters & Pumps 0 11-26-2002 07:42 AM
Check , Check and Re-Check a new refer saga. thenewkid64 Refrigerators 13 06-24-2002 10:54 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:39 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.