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FS16 Type 4 Valve

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The FS16x4 is a 1/4” fuel selector designed for high wing aircraft where it is possible to feed from both tanks simultaneously. It has four lever positions OFF - LEFT - BOTH – RIGHT with a 90 degree action between each position. Porting for the BOTH position is done internally so there is no need to T the two tanks together. There is also a safety feature where the red button on the lever has to be raised in order to switch off the fuel preventing the fuel from being switched off accidently.

On the FS16x4 there are 3 ports. The lower port is the outlet to the engine is 1/8 NPT Female. The inlet, side ports are 1/8 NPT Female and are at the 9 o'clock and 12 o'clock positions when looking at the valve with the brass ball spindle pointing upwards. At the 3 o'clock position there is a blanking plate that covers up a PTFE gland that opposises the forces of the other 2 PTFE glands. This cannot be removed.

One of the great features of this unit is that when the selector is in the OFF position, there is no cross feed between each tank. Therefore in a situation where an aeroplane parked on a slope, or if one tank is fuller than the other, no crossfeed will occur.


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