Digital guide
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Woodward 6945-680
Product Identification: Electro-Hydraulic Power Cylinder (EHPC) actuator — custom-configured linear integrating actuator for steam turbine control.
Product Overview: The 6945-680 is part of Woodward’s EHPC series. It is a linear integrating actuator used for steam turbine control valve or valve rack positioning, configured specifically for its intended application.
Detailed content
Working Principle: Utilizes a three-stage amplification of a low-pressure hydraulic oil source (80–250 psi) to generate output shaft force in response to a 0–200 mA integrating input signal.
Technical Specifications: (EHPC family baseline)
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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.
Installation Requirements:
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Rigid mount to valve/valve rack
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Filtered hydraulic supply, 80–250 psi
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ESD-safe handling
Usage Precautions: Same ESD and handling precautions as other EHPC units. Independent overspeed protection required for the prime mover.
