In the fluid control networks of petroleum refining and fine chemical processes—such as catalytic cracking, hydrorefining, and continuous blending—the micro-adjustment of medium flow and pressure demands extreme precision. Regulating valves often require real-time, high-frequency adjustments based on 4-20mA feedback signals from the Distributed Control System (DCS).
This continuous, uninterrupted fine-tuning causes the electric actuators driving the valves to start and stop frequently. Traditional actuators driven by brushed motors are highly susceptible to system failures or control hunting in such conditions due to carbon brush wear, motor heat accumulation (which triggers PTC overheat protection), and mechanical fatigue caused by frequent transmission gear reversals.
To withstand such severe operating fatigue, the engineering selection of equipment must be backed by rigorous industrial parameters; empirical selection alone cannot guarantee continuous operational reliability.
The actuator must comply with the S4 intermittent duty cycle standard. Its core driving power source should utilize a DC Brushless Motor. By eliminating mechanical friction contact surfaces, the brushless structure fundamentally eradicates electrical spark interference and the physical lifespan limitations caused by carbon brush wear, keeping heat accumulation significantly lower than traditional motors.
To achieve a high-frequency start-stop and reversal capacity of up to 1200 times per hour, the actuator must integrate reverse electromagnetic brake technology and a zero-damping positioning algorithm. This ensures that the damping characteristic during each positioning is 0 times, preventing mechanical oscillation and overshoot. The control logic must restrict the basic positioning error within an ultra-precise range of ≤±0.1%, thereby avoiding continuous minor "hunting" near the target position and mitigating mechanical fatigue in the gearbox.
As a professional manufacturer deeply rooted in fluid automation, DCL (Dynamic Corporation Limited) has launched dedicated brushless modulating electric actuators tailored for high-frequency regulation conditions, matching seamlessly with various quarter-turn butterfly and ball valves.
In terms of high-frequency anti-fatigue design, the DCL brushless modulating series is equipped with an industrial-grade Servo-Controller. Its circuit board utilizes a resin plastic package process, delivering exceptional anti-vibration and moisture-resistant performance. The transmission system incorporates a unique spring-loaded anti-backlash mechanism that efficiently eliminates transmission backlash between gears. Coupled with a high insulation resistance standard (100MΩ/500VDC) and ISO5211 direct-mount standard top plates, DCL actuators guarantee stable, consistent torque output even under a demanding workload of 1200 start-stops per hour.