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Purge Valves

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rv(at)thelefflers.com
Guest

Posted: Mon Oct 27, 2008 5:59 pm Post subject: Purge Valves

I’m in the process of building my tanks at the moment and have been researching how to plumb the purge valve.  I didn’t want to have to add anymore lines after I complete the tanks.  

   

I was under the impression that it would be best for the line from the purge valve to be run back to the left tank.   If you really want to go with a lavish solution you can run the return lines through the fuel tank switch and let the switch control which tank is connected.  Just having it routed to the tank left tank saves $$$ on the andair valve.  

   

In reading the purge valve documentation from AFP, it shows two solutions.   The first solution routes the return line to a tee connection in the fuel vent line.  My concern with this approach is that I’m not sure what would prevent the fuel not going out the vent line when purging.  

   

The second solution in their documentation has the return line routed to the left fuel line before the fuel selector valve.   My concern here is that the hot fuel will get mixed into the fuel line too soon and defeat one of the reasons of for the purge valve in a hot start situation.  

   

I am interested in hearing what others have done in regards to routing the return line and if my concerns are well founded or not.  

   

Thanks,  

   

Bob  

#40684  

      [quote][b]

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msausen

Joined: 25 Oct 2007
Posts: 559
Location: Appleton, WI USA

Posted: Tue Oct 28, 2008 2:53 am Post subject: Purge Valves

Bob, many people did option two and routed it back to the line before the selector.  Seems to work ok.  You wouldn’t have hot fuel circulating as long as you select the opposite tank.  In my particular case I plumbed the return to the right tank so when purging hot fuel I would select the left tank to draw from.  

   

Michael  

   

http://www.mykitlog.com/users/display_log.php?user=msausen&project=22&category=0&log=57694&row=22  

http://www.mykitlog.com/users/display_log.php?user=msausen&project=22&category=0&log=56523&row=23  

   

       

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Bob Leffler

 Sent: Monday, October 27, 2008 9:01 PM

 To: rv10-list(at)matronics.com

 Subject: Purge Valves  

  

  

   

I’m in the process of building my tanks at the moment and have been researching how to plumb the purge valve.  I didn’t want to have to add anymore lines after I complete the tanks.  

   

I was under the impression that it would be best for the line from the purge valve to be run back to the left tank.   If you really want to go with a lavish solution you can run the return lines through the fuel tank switch and let the switch control which tank is connected.  Just having it routed to the tank left tank saves $$$ on the andair valve.  

   

In reading the purge valve documentation from AFP, it shows two solutions.   The first solution routes the return line to a tee connection in the fuel vent line.  My concern with this approach is that I’m not sure what would prevent the fuel not going out the vent line when purging.  

   

The second solution in their documentation has the return line routed to the left fuel line before the fuel selector valve.   My concern here is that the hot fuel will get mixed into the fuel line too soon and defeat one of the reasons of for the purge valve in a hot start situation.  

   

I am interested in hearing what others have done in regards to routing the return line and if my concerns are well founded or not.  

   

Thanks,  

   

Bob  

#40684   	  Quote: 	
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recapen(at)earthlink.net
Guest

Posted: Tue Oct 28, 2008 4:03 am Post subject: Purge Valves

I put in the Andair dual valve and plumbed both sides in to the tank and further in to the second bay.  I had QB tanks and had to open them up for two SB's and getting my fuel senders aligned.



My thinking was that now I won't have to placard "Select Left tank for purge operations" as it will always go back from where it came.  Also, since I had the tanks open to put in a return line, I ran it in to the next bay at the same level to dilute the heat as you have discussed.



I'll be testing my fuel system this weekend - if it passes, the dragon will breathe.....



Ralph Capen



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n223rv(at)wolflakeairport
Guest

Posted: Tue Oct 28, 2008 7:13 am Post subject: Purge Valves

This is exactly what we did. It works great with very little additional plumbing and no modifications to the tank. Just be sure the fuel selector valve is on the opposite tank than the return is plumbed to when purging the system.

From: RV Builder (Michael Sausen) <rvbuilder(at)sausen.net>

Sent: Tuesday, October 28, 2008 6:51 AM

To: rv10-list(at)matronics.com <rv10-list(at)matronics.com>

Subject: RE: Purge Valves

  Bob, many people did option two and routed it back to the line before the selector.  Seems to work ok.  You wouldn’t have hot fuel circulating as long as you select the opposite tank.  In my particular case I plumbed the return to the right tank so when purging hot fuel I would select the left tank to draw from.

Michael

http://www.mykitlog.com/users/display_log.php?user=msausen&project=22&category=0&log=57694&row=22

http://www.mykitlog.com/users/display_log.php?user=msausen&project=22&category=0&log=56523&row=23

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Bob Leffler

 Sent: Monday, October 27, 2008 9:01 PM

 To: rv10-list(at)matronics.com

 Subject: Purge Valves

I’m in the process of building my tanks at the moment and have been researching how to plumb the purge valve.  I didn’t want to have to add anymore lines after I complete the tanks.

I was under the impression that it would be best for the line from the purge valve to be run back to the left tank.   If you really want to go with a lavish solution you can run the return lines through the fuel tank switch and let the switch control which tank is connected.  Just having it routed to the tank left tank saves $$$ on the andair valve.

In reading the purge valve documentation from AFP, it shows two solutions.   The first solution routes the return line to a tee connection in the fuel vent line.  My concern with this approach is that I’m not sure what would prevent the fuel not going out the vent line when purging.

The second solution in their documentation has the return line routed to the left fuel line before the fuel selector valve.   My concern here is that the hot fuel will get mixed into the fuel line too soon and defeat one of the reasons of for the purge valve in a hot start situation.

I am interested in hearing what others have done in regards to routing the return line and if my concerns are well founded or not.

Thanks,

[The entire original message is not included]  [quote][b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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carl.froehlich(at)cox.net
Guest

Posted: Tue Oct 28, 2008 2:59 pm Post subject: Purge Valves

I have 450 hours on my Airflow Performance 8A.  I installed a return line to top of the left tank for the purge valve.  Returning to either vent line is not a good idea.  

   

That said, I have never had a need to actually purge the engine.  I do however use the purge valve for normal engine shut down to bleed the pressure out of the spider.  Bottom line is I see no “hot fuel” problem for returning the purge line fuel to a T in the left tank fuel line, nor is there any reason to do the expensive option of having a ganged fuel selector valve.    

   

If you are still building, installing a ¼” bulkhead fitting in the left tank is simple enough to do even if you end up not using a purge valve and just cap it.  This is what I did for my 10.  

   

Carl Froehlich  

       

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Bob Leffler

 Sent: Monday, October 27, 2008 10:01 PM

 To: rv10-list(at)matronics.com

 Subject: Purge Valves  

  

  

   

I’m in the process of building my tanks at the moment and have been researching how to plumb the purge valve.  I didn’t want to have to add anymore lines after I complete the tanks.  

   

I was under the impression that it would be best for the line from the purge valve to be run back to the left tank.   If you really want to go with a lavish solution you can run the return lines through the fuel tank switch and let the switch control which tank is connected.  Just having it routed to the tank left tank saves $$$ on the andair valve.  

   

In reading the purge valve documentation from AFP, it shows two solutions.   The first solution routes the return line to a tee connection in the fuel vent line.  My concern with this approach is that I’m not sure what would prevent the fuel not going out the vent line when purging.  

   

The second solution in their documentation has the return line routed to the left fuel line before the fuel selector valve.   My concern here is that the hot fuel will get mixed into the fuel line too soon and defeat one of the reasons of for the purge valve in a hot start situation.  

   

I am interested in hearing what others have done in regards to routing the return line and if my concerns are well founded or not.  

   

Thanks,  

   

Bob  

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rv10builder(at)bellsouth.
Guest

Posted: Tue Oct 28, 2008 5:49 pm Post subject: Purge Valves

I too have the AFP system. I installed a "T" in the right fuel line. For 

hot starts I select the left tank and valve open which flushes cool fuel 

from the left tank back into the right (follow link below).



http://www.mykitlog.com/users/display_log.php?user=rv10builder&project=7&category=501&log=15056&row=37



Brian Sutherland

Nashville, TN

N104BS - 91 flying hours



Bob Leffler wrote:

 	  Quote: 	
		  

 I’m in the process of building my tanks at the moment and have been 

 researching how to plumb the purge valve. I didn’t want to have to add 

 anymore lines after I complete the tanks.



 I was under the impression that it would be best for the line from the 

 purge valve to be run back to the left tank. If you really want to go 

 with a lavish solution you can run the return lines through the fuel 

 tank switch and let the switch control which tank is connected. Just 

 having it routed to the tank left tank saves $$$ on the andair valve.



 In reading the purge valve documentation from AFP, it shows two 

 solutions. The first solution routes the return line to a tee 

 connection in the fuel vent line. My concern with this approach is 

 that I’m not sure what would prevent the fuel not going out the vent 

 line when purging.



 The second solution in their documentation has the return line routed 

 to the left fuel line before the fuel selector valve. My concern here 

 is that the hot fuel will get mixed into the fuel line too soon and 

 defeat one of the reasons of for the purge valve in a hot start situation.



 I am interested in hearing what others have done in regards to routing 

 the return line and if my concerns are well founded or not.



 Thanks,



 Bob



 #40684



 *

 *

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ricksked(at)embarqmail.co
Guest

Posted: Tue Oct 28, 2008 6:04 pm Post subject: Purge Valves

Well...almost flying, but I ran mine through the firewall with a AN-4 bulkhead adapter, inside the cabin and out the right wing root and tee'd it to the fuel supply, I also put a check valve from Andair inline to allow fuel to only flow to the tank, not from it. It seemed like a good idea to prevent fuel from being somehow drawn up to the purge valve. I really want to point out that the valve is a critical part of flight for the fuel system. If it should somehow open, you're gonna shut down the engine. I used the same control cable on the valve as I did the throttle and took the same care to run the cable as I did with all the engine/mixture/prop controls. I played with a failsafe closed return spring but ended up getting frustrated trying to find a balanced spring to make it work well in all positions as well as allowing me to operate the control. 

Rick Sked 

40185

---

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