Many existing Frame 5 turbine fuel gas systems use two modulating valves to supply the correct amount of fuel to the gas turbine. The upstream valve (Speed Ratio Valve or SRV) controls the inlet pressure to the downstream valve (Fuel Control Valve or FCV). The FCV then acts to regulate fuel flow in response to a position demand signal generated by the turbine fuel regulator (TFR). In 2-valve fuel control systems, the FCV inlet pressure setpoint is a function of turbine speed. Thus, at low turbine speeds, the SRV adjusts the FCV inlet pressure to some lower value. Conversely at high turbine speeds, the SRV adjusts the FCV inlet pressure to some higher value. When retrofitting 2-valve fuel gas systems, it is possible to use a single fuel control valve solution. Single valve systems are less complex and more compact than 2-valve systems. They also eliminate the need for hydraulic systems. And single valve fuel gas systems do not require a fuel valve inlet pressure transmitter to operate.