Digital guide
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Woodward 6945-674
Product Identification: Electro-Hydraulic Power Cylinder (EHPC) actuator — same product family as 6945-673, configured for a distinct application within Woodward’s custom EHPC program.
Product Overview: The 6945-674 is a linear integrating actuator in the EHPC series, designed for steam turbine control valve or valve rack positioning. As with all EHPC units, it is configured and manufactured for a specific application.
Detailed content
Working Principle: Uses a low-pressure (80–250 psi) hydraulic oil source, amplified through three stages to produce output shaft force proportional to the integrating input signal.
Technical Specifications: (EHPC family baseline — exact configuration parameters vary by application)
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Supply Pressure: 80 to 250 psi (552 to 1724 kPa)
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Input Power: 24 Vdc ±10% @ 2 A
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Input Signal: 0–200 mA integrating input signal (100 mA null)
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Position Feedback: 4–20 mA, 20–4 mA, 0–10 Vdc, or 10–0 Vdc
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Output Shaft Diameter: 1.750 in (44.45 mm)
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Shaft Material: Hardened 17-4 PH stainless steel
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Thread Size: 1.250 in –12 UNF-2A
Application Scenarios: Steam turbine control valves, valve rack positioning for mechanical-drive or generator-drive steam turbines.
Installation Requirements:
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Rigid mounting to valve/valve rack
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Filtered hydraulic supply within 80–250 psi range
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ESD-safe handling procedures
Usage Precautions: Same ESD and handling precautions as 6945-673. Unauthorized modification outside specified mechanical, electrical, or operating limits causes personal injury and/or property damage and voids warranty.
