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The LQ6 provides the flow range, accuracy, and response characteristics necessary for the control of industrial gas turbines in the 3 MW to 15 MW power range. By integrating Woodward’s proprietary electric actuation technology with a proven fuel-metering concept, exceptional performance and robustness are achieved in a compact, cost effective package. The use of onboard driver electronics simplifies system design and reduces installation space, time, and cost.
Please refer to Woodward Installation and Operation Manual 26515 for complete details of this product, its application and installation.
The LQ6 incorporates an electrically actuated rotary metering valve, a bypassing regulator, and an on-board driver module. These components are packaged within a common assembly to reduce cost and improve performance.
Highly accurate flow control is achieved by the use of a rotary plate element, embodying a precision-machined metering port. A seal shoe is loaded against the plate to achieve accurate flow area control over a wide range. The self-cleaning, shear-type action keeps the metering port free from contaminant deposits and system debris.
The metering section utilizes a single moving part with the valve plate, actuator rotor, and position feedback resolver mounted on a single shaft. Accurate flow versus input signal characteristics are achieved by the precision machining of the valve metering port, the use of large valve travels, and a high-precision resolver for valve position feedback. The LQ valve can achieve flow turn-down ratios in excess of 100 to 1.
The pressure differential across the metering valve port is held virtually constant by a bypassing-type regulator. When this pressure difference exceeds the selected level, the regulator piston progressively opens to bypass excess inlet flow back to the fuel pump inlet area. This pressure regulation system requires the use of a positive displacement, high-pressure fuel pump upstream of the LQ6 valve.
The use of rare-earth permanent magnets in an efficient electromagnetic circuit results in high actuation forces while minimizing package size. The closely integrated mechanical design eliminates backlash and provides virtually infinite valve positioning resolution.
Product Specification 03288