The Full Form of VBV is Variable Bleed Valve.
Variable Bleed Valve System
Variable Bleed Valves are used on all turbine aircraft engines to increase efficiency and prevent possible stalls at starting, idling, and low speed operation. S.S. White Flexible Shafts drive the actuation of many of these VBV systems, ringing the engine circumference to drive the opening and closing of the valves. Up to a dozen flexible shaft may be used on one engine to drive the valves, which operate like doors opening and closing to adjust the airflow to the High Pressure compressor.
VBV
means
Variable Bleed Valve
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