The Woodward VariStroke-I is an advanced electro-hydraulic linear actuator engineered for high-performance steam turbine valve control. Designed to handle the most challenging environments, it delivers fast, accurate positioning—even with contaminated lube oil—thanks to a dirt-tolerant design and self-cleaning rotary valve.
Ideal for both new installations and retrofits, the VariStroke-I replaces aging servo systems, improving response times and extending turbine uptime with built-in redundancy (dual 4–20 mA inputs and redundant position sensors). With configurable stroke lengths, failsafe operation, and built-in flow linearization, the VariStroke actuator reduces wear, simplifies commissioning, and enhances turbine speed and load control.
