Performance Parameters:​ Actuator time constant of 0.025 seconds, maximum speed of 920°/second, hysteresis 0.25°, repeatability 0.25°. The 3103 valve flows 50 to 40,000 lb/h with metering accuracy meeting industrial gas turbine control requirements.

Functional Features:​ Electrohydraulic servo proportional control with fast dynamic response; internal mechanical feedback delivering high open-loop accuracy; self-cleaning rotary sleeve adapted for foul fuels; spring-biased fail-safe position; optional dual-coil redundant configuration; inlet flow guide tube prevents contamination.

Application Scenarios:​ Gas turbine generator sets; natural gas compressor units; mechanical drive gas turbines; conventional and low-emission combustion systems.

Material Composition:​ Valve body and internal parts in stainless steel/hardened stainless steel; actuator housing in anodized aluminum; internal parts in hardened stainless steel; seals in Viton A elastomer.

Structural Features:​ Rotary sleeve gas metering valve with integrally mounted electrohydraulic servo actuator; self-cleaning rotary sleeve and shoe throttling structure; TM-55P proportional actuator with torque motor servovalve.

Working Principle:​ The TM-55P is an electrohydraulic, proportional actuator which converts electric control input to angular shaft output for positioning the rotary fuel metering sleeve of the valve. The essential element is a torque motor servovalve, which generates differential pressure across the ends of the second-stage spool valve to operate it. Input current to the torque motor gives proportional displacement of the spool valve and subsequent proportional movement of the servo piston. The piston’s linear motion is converted through internal linkage into output shaft rotation, which in turn rotates the 3103 valve’s metering sleeve to regulate gas flow.

Installation Requirements:​ Hydraulic oil cleanliness of ISO 4406 20/18/15 or higher; supply pressure of 2,758 to 6,895 kPa (400 to 1,000 psig); recommended viscosity of 0.6 to 400 centistokes; external filter of 10 μm nominal; supply pressure can be provided by a positive displacement or centrifugal pump; Woodward recommends the use of a pressure switch to ensure correct operating pressure is established before commissioning and during operation; the 3103 valve has two external drain provisions—use one suitable for the installation and plug the unused one (do not plug both!); route the drain line outside the turbine casing into a small container with clean light oil to verify gas tightness and prevent salt air corrosion of the shaft bearings in the cavity between the shaft seals.

Usage Precautions:​ Ensure proper filtration of the hydraulic fluid used in the TM-55P actuator; keep the immediate work area clean and free from contaminants; all electrical connections must be made using the Woodward Electric Control Manuals; avoid impact loads on the output shaft; regularly inspect hydraulic oil and filter status; the 3103 valve is a Last-Time-Buy item with the Woodward GS40/GS50 series as the recommended flange-to-flange compatible replacement.