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西门子GQD161.1A执行器技术说明：
This data sheets provides a quick overview of the rotary actuators. See data sheet
GQD..1, document number CE2N4605en_02 for detailed information on safety,
engineering notes, mounting and commissioning rotary actuators.
• For 2-port and 3-port threaded ball valves from DN15 to DN20.
• Suitable for use with modulating controllers (DC 0…10 V) or
3-position controllers.
• For plants where the rotary actuator must move to the zero position
during power failure (fail-safe function).
