Liquid Shutoff Valve
25
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 45 lb (20 kg)
valve is in the fuel line between the fuel
regulating valve and the turbine.
The valve diverts flows from the discharge
to bypass ports any time the operating
electrical signal is lost.
The valve is
available in two 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 (13 608 kg/h) based on US
MIL-C-7024 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).
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