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Woodward 6945-671
Product Name: Woodward EHPC Electro-Hydraulic Actuator (6945 Series)
Product Overview: This model belongs to Woodward’s EHPC (Electro-Hydraulic Position Controller) family, a linear integrated actuator typically used for steam turbine control valve or valve stand positioning. The actuator uses a low-pressure hydraulic oil source (80 to 250 psi / 552 to 1724 kPa) and employs a three-stage amplification to produce the required output shaft force. As a configured/custom actuator, the EHPC is designed and built for specific applications.
Detailed content
Technical Specifications:
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Output shaft diameter: 1.750 in (44.45 mm)
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Material: Hardened 17-4 PH stainless steel
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Thread size: 1.250 in – 12 UNF-2A
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Input power: 24 Vdc ±10% @ 2 A
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Input signal: 0 to 200 mA integrating input (100 mA null)
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Position feedback signal: 4 to 20 mA, 20 to 4 mA, 0 to 10 Vdc, or 10 to 0 Vdc
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Supply pressure: 80 to 250 psi (552 to 1724 kPa)
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Pressure sensitivity: not less than 2%
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Minimum steady-state supply flow: consult Woodward specification for the specific configuration
Functional Features: Linear integrated electro-hydraulic actuation; three-stage amplification; integrator input for precise positioning; configurable position feedback output; hardened stainless steel output shaft for durability; customized design for the specific application.
Application Scenarios: Steam turbine control valve positioning; valve stand linear positioning; other industrial applications requiring high-force, precise linear actuation with hydraulic power.
Structural Characteristics: Linear actuator with hardened 17-4 PH stainless steel output shaft. Uses a low-pressure hydraulic oil source amplified through three stages. Integrator-type input for positional control.
Working Principle: The actuator receives a 0 to 200 mA integrating input signal (with 100 mA representing null/center position). The internal three-stage hydraulic amplification converts the low-power electrical command into high-force linear motion of the output shaft. Position feedback is provided via 4 to 20 mA, 0 to 10 Vdc, or other configurable signals.
Installation Requirements: Mount according to the custom configuration designed for the specific application. Ensure the hydraulic supply pressure is within 80 to 250 psi (552 to 1724 kPa). Provide a 24 Vdc ±10% power supply capable of delivering 2 A. Use appropriate fittings for the 1.250 in – 12 UNF-2A output shaft thread.
Usage Notes: As a custom-configured actuator, refer to the specific configuration documentation provided by Woodward for detailed operating limits. Observe ESD precautions when handling electronic driver components. Ensure hydraulic fluid cleanliness meets Woodward specifications for the EHPC family.
