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Woodward 9907-526

  • Product Name:​ VariStroke-II Electro-Hydraulic Actuator (model 9907-526 configuration)
  • Product Introduction:​ The VariStroke-II is an electro-hydraulic actuator that provides precise, high-force linear positioning for fuel valve and turbine control applications. Model 9907-526 defines a specific stroke length, bore size, and failsafe configuration within the VariStroke-II family.
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Detailed content

  • Technical Specifications:​
    • Linearity: ±1.0% of full range
    • Repeatability: ±0.5% of full range
    • Temperature Drift: 0.04%/°C
    • Open Slew Rate: >200 mm/s (8 in/s)
    • Close/Trip Slew Rate: Up to 254 mm/s (10 in/s)
    • Stroke Lengths: 50–457 mm (2–18 in), model-dependent (102, 203, 305, or 457 mm)
    • Max Stall Force: 450–18,000 kg (1,000–40,000 lb) @ 35 bar (500 psi), model-dependent
    • Cylinder Bore Sizes: 102, 152, 254, or 305 mm (4, 6, 10, or 12 in)
    • Cylinder Type: Double-acting (model-dependent)
    • Hydraulic Supply Pressure: 5.5 to 35 bar (80 to 500 psi)
    • Hydraulic Oil Cleanliness: ISO 20/16 class (40 μm nominal)
    • Electrical Input: Isolated 4–20 mA analog input; 90–150 Vdc or 90–132/180–264 Vac @ 47–440 Hz
    • Discrete I/O: Isolated 4–20 mA output; Run/Enable discrete input; Alarm & Trip relay drivers (500 mA max @ 18–32 Vdc)
    • Network: Dual redundant CANopen ports; DB-9 RS-232 service tool port
    • Environmental: IP66 per EN 60529; 0.015 G²/Hz random vibration (10–500 Hz, 1.04 Grms)
    • Certifications: CE (EMC 2004/108/EC); ATEX Zone 2 Cat 3 II G Ex nA II T3, Zone 1 Cat 2 II G Ex d IIB T3, Zone 2 Cat 3 IIC T3; cUL Class I Div 1 Groups C&D, Class I Div 2 Groups A–D, T3 @ 93°C
  • Functional Features:​ Failsafe operation via internal return spring on servo valve; configuration and valve flow linearization via PC-based Service Tool through RS-232; redundant LVDT position sensors; self-cleaning shear-type action; visual stroke gauge included.
  • Working Principle:​ Receives a 4–20 mA position command, compares it to LVDT feedback, drives the onboard servo valve to direct hydraulic flow to the double-acting cylinder, and moves the piston to the commanded position. Dual redundant CANopen enables networked control and diagnostics.
  • Application Scenarios:​ Fuel valve actuation for gas and steam turbines; precise linear positioning where high force and failsafe capability are required in hazardous industrial environments.
  • Structural Characteristics:​ Double-acting hydraulic cylinder with integrated servo valve and onboard driver; redundant LVDT; model-dependent mounting flange pattern; can be mounted in any attitude.
  • Installation Requirements:​ Requires external hydraulic power supply (5.5–35 bar); electrical connections must use shielded wiring; hydraulic fluid must meet ISO 20/16 cleanliness; install per model-specific outline drawing.
  • Usage Notes:​ Configure and calibrate using the VariStroke-II Service Tool; verify failsafe direction (extend or retract) per model; observe ATEX/cUL hazardous location restrictions.

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