A7™ Service Manual 046-006272-00 1 - 21
Theory of Operation Gas Flow
FIGURE 1-14
1.3.4.5.2 BFCS - Needle Valves
The needle valve assembly controls the valve port openness by converting the rotation movement of
the knobs into the linear movement of the valve core and thus controls the gas flow. The needle
valve assembly is configured with a tact switch. When a needle valve is closed, the valve core triggers
the tact switch to monitor the close status of the needle valve and feed back the status to the control
unit.
The following figure is a model of the BFCS backup needle valve module.
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