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.