How does a servomotor work in a steam turbine?
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A servomotor in a steam turbine is a critical component of the governor system, responsible for controlling steam flow and regulating turbine speed based on load demand. It receives signals from the governor and adjusts the steam control valve to maintain stable and efficient operation. By continuously fine-tuning the valve position, the servomotor prevents over speed and ensures optimal energy utilization. In industries using back pressure steam turbines, an efficient servomotor system enhances performance by optimizing steam consumption and maintaining precise control. For high-quality turbine solutions, NCON Turbines, a trusted name among back pressure steam turbine manufacturers.
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In a steam turbine, the servomotor is a hydraulic actuator that controls the steam control valves. The governor or electronic control system monitors turbine speed and load.
When adjustment is required, it sends a signal to a pilot valve, which directs high-pressure oil to one side of the servomotor piston and drains oil from the other side. The resulting pressure difference moves the piston, which is mechanically linked to the steam valve.
This changes the valve opening, regulating steam flow and turbine power. It provides precise, continuous control, and loss of oil pressure typically causes the valves to close for safety.