Woodward GSOV50 Fuel Isolation Valve

Applications

The Woodward GSOV50 fuel isolation valve is designed to provide extremely fast

shutoff of gaseous fuel flow to an industrial gas turbine engine. Gas flow is stopped

when the valve is closed, with zero leakage from inlet to outlet. The HT version can

withstand higher fuel temperatures and higher back pressures than the standard version.

It is suitable for operation with gas temperatures between –4 and +350 °F (–20 and +177 °C).

The valve can achieve ANSI Class VI shut-off capability in the reverse flow direction with

a pressure differential of 500 psi (3448 kPa).

The normally-closed valve may be used for emergency and normal shutdown

operations. The special seal design in the main piston valve allows long life and

prevents leakage. Stainless steel construction ensures valve availability despite

corrosive service conditions.

This product is suitable for use on industrial turbines in the 10 to 50 MW power

output range with single or multiple combustion fuel manifold systems.

Description

The GSOV50 fuel isolation valve provides shutdown on a gas turbine by rapidly

halting the flow of gaseous fuel. The supply pressure is used to move a spring

loaded piston in the valve. When the valve is energized, gas pressure drives the

spring-loaded piston open, admitting fuel to the turbine. When the current signal to

the electrical solenoid is interrupted, the spring loaded second-stage piston changes

states to vent off primary control pressure. The main spring then forces the primary

piston to the seal, stopping all flow.

Features and Benefits

• Special seal design in the main piston valve allows long life and prevents leakage.

• Stainless steel construction ensures valve availability despite corrosive service conditions.

• ANSI Class VI shut-off capability in the reserve flow direction with a pressure differential of 500 psi (3449 kPa).

• Designed for several fuel sources: natural gas, propane, ethane, or methane.

• Closes in <0.100 seconds at 900 psig (6200 kPa).

• Rated at <10 psig (69 kPa) pressure drop at flow of 25.000 lb/h (11.340kg/h)

• Safety Integrity Level: Systematic Capability SC 3 (SIL 3 Capable)

• Up to 50% Hydrogen Compatible.

• Formerly known as the GSOV25-HT

Product Variants

• 24 VDC or 125 VDC Input Voltage Options

• Internal or External Pilot Pressure Options

• Proximity Switch with Normally Open or Closed Contacts

Product Specifications

• Gas Supply Pressure: 100-900 psig (690-6200 kPA)

• Fuel Temperature: -4 to +350 degrees Fahrenheit (-20 to +177 degrees Celsius)

• Ambient Temperature: -4 to +250 degrees Fahrenheit (-20 to +121 degrees Celsius)

• Main Seat Forward Leakage: ANSI/FCI 70-2. Class VI

• Main Seat Reverse Leakage: ANSI/FCI 70-2. Class VI, up to 500 psid (3.448kPA) reverse pressure differential

• Flange: ANSI 600# RF Flange