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Servo valve tag no

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G.Rajesh

Why some servo valves tag no is 90 other is 65? Is it due to flow or other reason?
 
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otised

The reason is GE's interpretation of the NEMA standard used for their nomenclature (tagging) of devices. "65" is for a governor control, and is used for the Gas Control Valve and Liquid Fuel Control Valve. "90" is for a generic control, and is used for most of the other control servos on the GE gas turbines.
 
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