REFLECTOR: Electric fuel valves

[Jim Sower]

That's true.  I would have preferred solenoid valves that would fail 
open.  However, as a practical matter, with the valves powered by the 
main buss, if you can't move the valve one of two things are happening:  
a) you have a serious electrical failure and are heading for the nearest 
airport you can land at, and should have more than sufficient fuel in 
the tank that IS transferring (it was, after all, the one with too much 
fuel in it) to get you there;  or  b) the valve failed closed and would 
not open when you saw your tanks were even again, so now you have half 
as much fuel as you thought, which should be more than adequate to get 
to a decent en route alternate.
So in the cosmic scheme of things, it really doesn't matter ... Jim S.

KeithHallsten wrote:

>No, these need power to move, so they fail in the last position selected.
>This is in contrast to typical solenoid valves, which are spring loaded to
>one position (either open or closed) and need continuous power to phold them
>in the other position.
>
>Keith Hallsten
>
>
>----- Original Message ----- 
>From: "Scott Derrick" <scott at tnstaafl.net>
>To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>Sent: Friday, October 29, 2004 4:33 PM
>Subject: Re: REFLECTOR: Uneven fuel draw
>
>
>  
>
>>jim,
>>
>>Are you saying these are fail closed?
>>
>>Scott
>>
>>At 10:59 AM 10/29/2004, you wrote:
>>    
>>
>>>Don't recall.  They are from JCW and are fuel tank selector valves.  They
>>>have supply and return for two tanks.  That's SIX nipples.  I only used
>>>two and plugged the other four.  I used them because the guy who sold
>>>      
>>>
>them
>  
>
>>>to me made me an offer I couldn't refuse.  I was seriously considering
>>>manual valves from Wicks for about $10 but wire is easier to string than
>>>cable.  There used to be solenoid valves that failed open at JCW but
>>>they're not there any more.
>>>Think about the manual valves too .... Jim S.
>>>
>>>
>>><mailto:PVTPIL8 at aol.com>PVTPIL8 at aol.com wrote:
>>>      
>>>
>>>>Canarder Thanks for the info what were the valve part numbers.
>>>>Steve
>>>>
>>>>
>>>>        
>>>>

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