SERVO VALVE CALIBRATION / Null Bias
Servo valve calibration (Null bias) Formula During the initial setting, the turbine will drop to launch speed. The ignition sequence will begin and fuel will be injected into the turbine at a fixed firing rate. Once ignition is achieved, the fuel flow will be withdrawn to the warm-up level for one minute to allow the hot gas passage to warm up. Waheed u'llah Marwat I&C Engineer Any negative bias error in the bypass valve causes a certain amount of delay in the actual flow of the ref and may result in insufficient fuel flow to stop the light. There is a procedure in the AOIO control specification drawing that describes the correct procedure for adjusting and checking the current setting on the bypass valve. FAISAL AHMED DUR...

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