Electric Remote Fuel Valve

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by TMann, Nov 7, 2019.

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  1. Nov 7, 2019 #1

    TMann

    TMann

    TMann

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    I'm looking for suggestions (i.e. Part#) for an electric fuel valve that I can stick in the back of my Velocity to avoid a long run of fuel lines forward and back.
    Andair has just introduced something that looks very promising but it's AN-6 & 28V.
    I would wait for a AN-8 12V if I knew it was coming.
    I don't need a duplex valve and a power off open default is a must.

    Anybody flying with such an arrangement?
     
  2. Nov 8, 2019 #2

    spaschke

    spaschke

    spaschke

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    you just gave me an idea on how to control my heat/defrost temperature. I have this an8 valve regulating the coolant going to the heater core, but I can't reach the valve while flying. I could use a servo. This could work for you also but not as elegant a solution as the Andair product.
    [​IMG] [​IMG][​IMG]
     
  3. Nov 8, 2019 #3

    TMann

    TMann

    TMann

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    I did find this one which is 12v and NO (normally open) $103
    [​IMG]
     
  4. Nov 8, 2019 #4

    gtae07

    gtae07

    gtae07

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    Could you use a manual valve and a push/pull rod or something? Perhaps not the lightest option but maybe close to weight-neutral considering a run of fuel lines plus the fuel in them?
     
  5. Nov 8, 2019 #5

    TMann

    TMann

    TMann

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    The problem I'm running into is trying to find room within the tunnel to accommodate the fuel lines and valve.
    The tunnel stops at the bulkhead that makes up the back of the front seats.
    Inside that I have my control rods, hydraulic cylinder for the nose gear, etc.
    On the backside of that bulkhead I have what they are calling a "Whale Tail" that is connected to control cables for the Ailerons.
    On the floor is the long cylinder for the main gear.

    Bottom line..... lots of stuff to avoid.
    My initial plan was to setup a fuel valve up front with Left/Right/Both/Off selection options.
    I just can't find a route for the fuel lines that is going to work for me to make that happen.
    This has been a real show stopper for me and while I resisted for a long time now, I believe it is time to move on to option "B".
    Routing a cable or control rod would create another set of issues.
     
  6. Nov 8, 2019 #6

    Mad MAC

    Mad MAC

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    I would suggest that for ensuring system robustness the installed valve control should also indicate the valve postion in a manner that detects the actual valve postion, probably a couple of micro switches would do it. Making sure to avoid the 3 mile island scenario where the indicator just shows the postion of the switch.
     
  7. Nov 12, 2019 at 3:00 PM #7

    TMann

    TMann

    TMann

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    I'm also looking at these valves.
     
  8. Nov 15, 2019 at 7:48 PM #8

    TMann

    TMann

    TMann

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    Just about ready to pull the trigger on this. The valves are normally open and only close when power is applied. For that reason, I plan on having a battery backup in the event that I need to shutoff the fuel completely. I entertained the Idea of adding a mechanical valve of some sort but have ruled that out due to the added complexity involved in routing it.
    I also considered an additional valve beyond the two-into-one manifold and again ruled that out as being overly redundant (especially when you consider that this plane had zero fuel control previously, i.e. always on.)
    As far as installing some valve position sensor .... these valves are all enclosed so it's not like there is something by which you could trigger such with. About the only way you could detect the status of the valve would be to use a fuel flow indicator. That said, I'm looking for some LED switches that will illuminate a red triangle when the valve is powered (in the closed position.)
    I perceive that the only time I will be using these will be in the event of an uneven fuel flow from one tank or bad fuel in one side (both of which should be very remote.)
    A couple of notes about the fuel system design:
    There is a manifold that the vent lines run into which should allow the tanks to cross-vent to eliminate the likelihood of an uneven feed. It also offers a means to eliminate a possible siphon from being established.
    I have 5 one way valves in the system:
    • Two are inline between the tanks and the sump.
    • Two allow air out of the sump but not back in.
    • One allows cabin air into the vent manifold but not out into the cabin.
    The last one is to allow a vent to be established in the event that the two external vents become obstructed in some manner.
    There are two optical fuel level sensors (one for each half of the sump) which will illuminate a panel warning light in the event that you should ever get down to your last 5 gallons of fuel.

    NOTE: The drawing does not show the "Manual" fuel shutoff valves between the wing tank and the sump for maintenance purposes.
    FuelSystemDiagram.png
     
    Last edited: Nov 15, 2019 at 8:09 PM

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