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The Liquid Shutoff Valve is a three-way valve designed to rapidly shut off all liquid fuel flow and prevent leakage to the turbine. In the de-energized state, the valve diverts inlet flow to bypass ports, preventing pressure damage to positive displacement fluid systems.
Normal installation of the 21.5 pound (9.8 kg) valve is in the fuel line between the fuel regulating valve and the turbine.
The valve diverts flow from the discharge to bypass ports anytime the operating electrical signal is lost.
The valve is available in four voltage configurations. The valve is designed for a normal operating supply pressure of up to 1200 psig (8274 kPa) and has a rated flow of 30 000 lb/h (13 600 kg/h) (based on US MIL-C7024 calibrating fluid at 70 °F/21 °C).
The Woodward Liquid Shutoff Valve is a two-stage valve. It uses supply pressure to provide a complete shutoff of fuel flow in 0.09 seconds or less after termination of a solenoid current. Valve closure is due to spring compression assisted by supply pressure.
The valve is compatible with almost all fuels including diesel fuel, methanol, ethanol, Jet “A”, kerosene, #2 home heating oil, heated light crudes, and residuals. The valve will accommodate contaminated fuels within prescribed limits.
An inlet screen in the valve prevents contaminants in excess of 40 µm nominal, from damaging the pilot valve section.
The valve housing is constructed of anodized aluminum. Hardened stainless steel is used for all internal parts. The valve is designed for proof pressures of 1800 psig (12 411 kPa) and burst pressures of 6000 psig (41 370 kPa).
Product Specification 40135