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Woodward 9904-1281
Product Name: Woodward 9904-1281 – No unique public datasheet located for this exact suffix; it belongs to the Woodward 9904 series of fuel valve components.
Product Brief: Part of Woodward’s 9904 series of engine and turbine fuel system valves. Based on the 9904 family, it is typically associated with hydraulic or liquid fuel valve assemblies for gas turbine applications.
Detailed content
Technical Specifications & Features: Specific pressure, flow, and electrical ratings for 9904-1281 are not separately published. For reference, the 9904 series Liquid Bypass and Stop Valves feature: maximum fluid supply pressure up to 1200 psig (8274 kPa), fuel temperature range 0 to +200°F (-18 to +93°C), ambient temperature +50 to +150°F (+10 to +66°C), and 25 μm at Beta 200 fuel filtration standard.
Materials & Construction: The 9904 series uses hardened stainless steel internal metering cages and electroless nickel-plated hardened sliding metering pistons for wear and corrosion resistance. All fuel-to-hydraulic interfaces use a dual seal design with a vent port. External seals are static elastomeric.
Working Principle: 9904-series valves use a double-piston arrangement where hydraulic pressure acts on one side of the piston and a failsafe spring on the other. Loss of hydraulic trip pressure causes the return spring to force the piston to the bypass position, diverting fuel away from the turbine.
Installation & Notes: All 9904-series fluid ports use 2-inch (50 mm) or 3-inch (75 mm) SAE flanges per SAE J518 Code 61. Installation must follow the relevant Woodward manual for the specific valve model.
