Technical Specifications:​ As a member of the 9908 series oil metering valve family, it shares the common hydraulic liquid metering valve platform. The official Woodward Oil Metering Valve Installation and Operation Manual covers 9908-002, 9908-300, and similar configurations. The 505 microprocessor governor control unit is specifically designed to operate steam turbines as well as turbine generator and turbine expander modules.

Functional Features:​ Precision hydraulic oil metering for fuel control; compatible with Woodward 505/505E microprocessor-based governor control units; designed for steam turbine, turbine generator, and turbine expander module operation.

Application Scenarios:​ Steam turbine control systems; gas turbine liquid fuel metering; works with Woodward control systems for turbine control applications.

Material Composition:​ Corrosion-resistant alloy and stainless steel construction consistent with Woodward hydraulic liquid metering valve standards; FKM sealing elements.

Structural Features:​ Based on the hydraulic liquid metering valve platform, incorporating dual coil electrohydraulic servo valve assembly, trip relay valve assembly, hydraulic filter assembly, and DCDT position feedback sensor (as documented in Woodward technical manuals).

Working Principle:​ As an oil metering valve, it uses a dual coil electrohydraulic servo valve assembly to control the position of the metering valve plunger. A DCDT position feedback sensor provides position feedback to the control system. The 505 digital governor control unit receives speed signals from magnetic pickups, compares with internal speed setpoint, and outputs 4-20 mA control signals through PID amplification to the electrohydraulic converter for valve positioning.