Fuel supply system with combined metering and shutoff valve

A gas turbine engine comprising:

• a fuel tank and a fuel supply system including a fuel pump, the fuel system selectively providing fuel to a combustor in the gas turbine engine, the fuel supply system further including:
• a metering valve connected to the fuel pump, the metering valve includes a metering valve spool which is movable to control a volume of fuel passing through the metering valve;
• the metering valve has an extension chamber and a retraction chamber on opposed sides of a land on the metering valve spool, and the extension chamber and the retraction chamber communicating with a servo valve to communicate a high pressure fluid and a low pressure connection to one of the extension chamber and the retraction chamber to extend or retract the metering valve spool;
• a forward valve spool face on a forward side of the metering valve spool, and a pump line connects the metering valve to the pump through a metering valve housing, the pump line extends into a metering valve inlet chamber providing a force against the forward valve spool face;
• a seal is in said metering valve housing such that the forward face of the metering valve spool may seal against the seal in the metering valve housing to block flow into the metering valve inlet chamber;
• a fuel line extends through the metering valve housing from the metering valve inlet chamber to a pressure regulating valve, the pressure regulating valve is downstream of the metering valve and has a pressure regulative spool having opposed faces with one of the opposed faces seeing a pressure from the fuel line downstream of the metering valve, and an opposed valve face of the pressure regulating spool seeing a pressure from the metering valve inlet chamber from a tap, and a line downstream of the pressure regulating valve to be connected to a combustor;
• and
• a controller is programmed for controlling a position of the metering valve spool, the controller selectively controls the servo valve to move the metering valve spool to control a volume of fuel delivered from the chamber to the pressure regulating valve, and further being programmed to move the metering valve spool to a position where the forward valve spool face seals on the seal in the metering valve housing to block pump flow reaching the pressure regulating valve, and also reaching the tap.