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The FS20-20 is a 3 way Duplex Fuel
Selector and allows for two lines to be switched
simultaneously, this means that the return fuel from the
engines fuel injector/manifold block can be returned to
the same tank from which it was drawn.
The valve has the positions
LEFT - RIGHT - OFF.
When the valve is in the ON
condition, there is an easy action between the LEFT and
RIGHT position. Inside the valve is are highly polished
ball valves packed with precision PTFE seals. This not
only provides a smooth action but also gives a perfect
seal.
To switch the valve to OFF the
red safety button on top of the lever must be raised.
This therefore helps to prevent the pilot inadvertently
switching the fuel OFF.
Q: Why use an Andair Duplex
Valve to return the fuel to the same tank from which it
was drawn? Why cant I return it to a single tank. A:
Returning the fuel to the same tank from which it was
drawn does away with any potential over filling issues.
If you return to a single tank, and you happen to be
feeding from the other tank (perhaps the pilot is
unaware of the fuel system layout) and that tank is
full, you will start to dump fuel overboard. This is not
a problem on short flights, however if you are doing a
long leg, you could get a fuel outage.
On the FS20-20 either the upper
of the lower section can be used as the feed or return.
It can be configured with any of the eight 3/8 fittings
that Andair currently manufacture, and this can be done
during the ordering process. Also during ordering the
fascia plates' engraving can be customised.
Click
here
to download the tech. sheet for the FS20-20
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