Technical Specifications Supply pressure: 150–300 psi hydraulic oil; control input: 4–20 mA from electric governor; output flow: 8 gpm maximum at 200 psi; operating temperature: -20 °C to +80 °C; filtration: 10 micron nominal inlet; enclosure: IP54; torque motor pilot stage.
Functional Features Electro-hydraulic servo control; flow proportional to input signal; pressure compensation; null adjustment; built-in inlet filtration; soft shift response.
Application Scenarios Steam turbine governor drive, hydro turbine wicket gate control, large engine hydraulic fuel control, industrial hydraulic servo systems.
Performance Parameters Flow linearity: ±2% full scale; response time: < 30 ms; null drift: < 1% per 10 °C; hysteresis: < 3% full scale.
Material Composition Ductile iron body, stainless steel spool and sleeve, torque motor pilot stage, oil seals, inlet filter element.
Structural Characteristics Subplate mounting; hydraulic ports on bottom; electrical connector on side; adjustable null screw; integral inlet filter.
Working Principle The unit receives a 4–20 mA control signal from the electric governor, positions the torque motor to shift the servo spool, and directs hydraulic flow to the actuator to control speed or position.
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