In the highly automated, continuously operating industrial system of a modern power plant, equipment selection is not only a matter of operational efficiency but also directly impacts overall safety and economic performance. Among the various valve actuation methods, electric valves have gradually become the mainstream choice—a trend driven by their comprehensive advantages in control capability, environmental adaptability, operational performance, and life-cycle cost.
Electric valves seamlessly integrate with Distributed Control Systems (DCS) or PLC systems. As end actuators, they can directly receive 4–20 mA analog signals or digital commands to achieve continuous valve position adjustment and remote control. This high level of integration enables their involvement in critical processes such as boiler feedwater regulation and turbine bypass control, supporting the evolution of power plants toward "minimal-attendance" and even "unmanned" operations.
Electric valves demonstrate strong stability in challenging environments. Power plant conditions often involve high temperatures, high pressures, dust, and corrosive media. High-quality electric actuators, designed with advanced ingress protection ratings and heat-resistant materials, ensure long-term reliable operation. Additionally, their fail-in-place functionality maintains the valve position during sudden power outages, preventing system loss of control. Built-in over-torque and over-temperature protection mechanisms further reduce the risk of equipment damage.
Electric valves offer high control precision and repeatability. With servo motors and precision gearing, they can achieve fine opening adjustments to meet the stringent accuracy requirements of processes such as chemical dosing and desuperheating water regulation. As technology advances, the response speed of electric actuators has significantly improved, enabling smooth and timely adjustments during load changes in generating units.
From a life-cycle cost perspective, electric valves hold a clear advantage. They consume electrical power only during operation and draw almost no energy when maintaining a fixed position, making them more energy-efficient than pneumatic valves that rely on continuous air supply. Moreover, electric valves eliminate the need for complex compressed air systems, reducing auxiliary equipment investment and maintenance costs. Although the initial procurement cost may be relatively higher, their lower failure rates and reduced maintenance requirements make them more cost-competitive over the long term.
Electric valves also excel in safety and regulatory aspects. For potentially explosive environments within power plants, explosion-proof certified electric actuators can be selected to mitigate safety risks at the source. At the same time, electric systems are free from issues such as air leakage, offering greater operational stability.
In summary, electric valves are not merely actuating devices but critical nodes in the automation architecture of power plants. Their outstanding performance in control accuracy, system integration, operational reliability, and economic efficiency makes them a vital pillar for achieving safe, efficient, and intelligent operations in modern power facilities.
