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Woodward 8915-669
Product Name: Woodward 3171 Gas Valve with Actuator
Product Introduction: The 8915-584 is catalogued in Woodward’s 3171 valve-and-actuator family, supplied as a complete valve-and-actuator assembly. The 3171 series is Woodward’s line of gas fuel metering valves paired with an actuator for gas-turbine fuel control. As a member of this family, the 8915-584 is intended for fuel metering duties on industrial gas turbines where a pre-assembled, calibrated valve-actuator package is required.
Detailed content
Technical Specifications:
- Catalogued Configuration: 3171 Valve c/w EM35 Actuator
- Product Family: Woodward 3171 gas metering valve series with EM35 electric actuator
Functional Features:
- All-electric EM35 actuator integration – no hydraulic power unit required
- Factory-matched valve and actuator, supplied as a calibrated assembly
- Part of the 3171 series for gas-turbine fuel metering
Application Scenarios: Industrial gas-turbine fuel control; installations where hydraulic infrastructure is undesirable; turbine packages requiring electric actuation of the fuel metering valve.
Material Composition: 3171 valve bodies in the Woodward series are typically stainless steel; EM35 actuator housings are explosion-proof cast aluminum with samarium-cobalt permanent magnet brushless DC motors.
Working Principle: The control system issues a position command to the EM35 driver. The driver energizes the brushless DC motor, whose rotation is reduced by the planetary gearhead and coupled to the 3171 valve’s metering element, changing the fuel flow area. A resolver provides position feedback to close the control loop. On power loss, a spring returns the valve to the minimum-fuel fail-safe position.
Installation Requirements: Comply with Woodward’s published installation practices for 3171/EM35 assemblies, including proper lifting, flange torque, electrical grounding, and fuel filtration to the specification called out for the 3171/EM35 package.
Usage Precautions: Do not energize or de-energize electrical connections while the circuit is live in hazardous areas. Do not exceed the pressure ratings defined for the specific 3171/EM35 configuration. Follow Woodward’s safety instructions regarding overspeed/overtemperature/overpressure protection – the valve actuator is part of the turbine control system and must be backed by an independent overspeed shutdown device .
