Technical Specifications Supply pressure: 150–300 psi; rated flow: 20 gpm at 100 psi differential; control input: 4–20 mA analog; coil resistance: 80 Ω ±5%; response time: < 25 ms step; linearity: ±1% full scale; operating temperature: -20 °C to +100 °C; pressure rating: 500 psi maximum; enclosure: IP65.
Functional Features Two-stage servo design; pressure-compensated spool; zero and span adjustment; integral 10 micron inlet filter; dither compatible; high force-to-mass ratio.
Application Scenarios Steam turbine governor control, hydro turbine wicket gate actuation, engine hydraulic fuel control, industrial hydraulic servo systems, precision position control loops.
Performance Parameters Step response time: < 25 ms for 100% stroke; hysteresis: < 3% full scale; threshold sensitivity: < 0.5% signal; internal leakage: < 5% of rated flow.
Material Composition Ductile iron valve body, stainless steel spool and sleeve, torque motor pilot stage, nitrile rubber seals, aluminum coil housing.
Structural Characteristics Subplate mounting; side-mounted torque motor; top zero and span adjustment screws; integral inlet filter; standard SAE port pattern.
Working Principle The 4–20 mA control signal positions the torque motor pilot stage, which directs control pressure to shift the main spool. The main spool modulates hydraulic flow direction and rate proportionally to the input signal, delivering precise hydraulic power to the actuator.
Installation Requirements Mount on precision ground subplate; connect supply, return and actuator lines; connect 4–20 mA control signal; adjust zero and span during commissioning.
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