Fuel Flow
Gas fuel flow is normally achieved by the accurate scheduling of the metering valve port area, based on values for
gas properties, operating pressures, and temperature. The GS-Series valve is factory calibrated under flow and
pressure conditions to provide an accurate valve metering to the input demand signal. Flow equations for the valves
are located in the O&M manual. These can be used to set up the valve for any site-specific conditions.
Port Sizes
The GS-Series is available with five different port sizes to optimize valve performance for various flow and pressure
drop requirements. Standard port effective area sizes are:
GS40
• 0.30 in² (193.5 mm²)
• 0.75 in² (483.9 mm²)
GS50
• 1.0 in² (645.2 mm²)
• 1.5 in² (967.7 mm²)
• 2.0 in² (1290.3 mm²)
The standard metering ports are contoured to provide approximately square law relationships between commanded
position and effective area.
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