Patent ID: 8919094

Claim:
A fuel metering system, comprising: a bypass valve (BV) configured to receive a fuel flow under an incoming fuel pressure and to output a fuel flow under a drain pressure while regulating a servo system delta pressure, the servo system delta pressure being a difference between the incoming fuel pressure and a cavity pressure; a pressure regulating valve (PRV) in fluid communication with the BV and configured to receive a fuel flow under an intermediate pressure and to output a fuel flow under the drain pressure while regulating a metering window delta pressure, the metering window delta pressure being a difference between the incoming fuel pressure and an outgoing fuel pressure; a metering valve (MV) in fluid communication with the BV and the PRV, and configured to receive the fuel flow under the incoming fuel pressure and to output a fuel flow under the outgoing fuel pressure; a single stage servo valve (SSSV) in fluid communication with the BV, the PRV and the MV, and configured to receive the fuel flow under the incoming fuel pressure, and to output the fuel flow under the intermediate pressure, and to output a fuel flow under a modulated pressure; and a linear variable differential transformer (LVDT) coupled to the MV.