Fuel control system

A bypass valve for a fuel control system, the bypass valve comprising:

• a sleeve having a body having a sleeve inner bore to define a cylindrical portion with opposing ends including a first end and a second end that axially opposes the first end,
• the body including a plurality of ports, including:
• a first bypass valve port that fluidly connects to the sleeve inner bore through the first end, wherein the first bypass valve port is fluidly connected to receive fluid from a metering valve, the metering valve being fluidly connected to a fuel pump outlet of a fuel pump,
• a second bypass valve port that fluidly connects to the sleeve inner bore through the cylindrical portion proximate the first end, the second bypass valve port being is fluidly connected to discharge fluid to a fuel pump inlet for the fuel pump,
• a third bypass valve port that fluidly connects to the sleeve inner bore through the cylindrical portion intermediate the plurality of ends, the third bypass valve port being fluidly connected to the fuel pump outlet, and
• a fourth bypass valve port that fluidly connects to the sleeve inner bore, wherein the fourth bypass valve port is fluidly connected to an actuator switch that switches between a first state and a second state, and
• a fifth bypass valve port that fluidly connects to the sleeve inner bore through the cylindrical portion intermediate the first end and the third bypass valve port, the fifth bypass valve port being a shutoff port, and
• a spool slidably disposed within the sleeve inner bore, the spool including a spool body having a spool inner bore to define a spool cylindrical portion, the spool cylindrical portion including opposing spool ends including a first spool end and a second spool end that opposes the first spool end, wherein the first spool end is closed, and wherein the first spool end faces the first end of the sleeve and the second spool end faces the second end of the sleeve,
• the spool movable between:
• a first position wherein the first spool end is axially against the first end of the sleeve, whereby the sleeve inner bore is fluidly isolated from each of the first bypass valve port, the second bypass valve port, the third bypass valve port and the fifth bypass valve port;
• and
• a second position wherein the first spool end is axially spaced from the first end of the sleeve body, whereby a plurality of fluid connections are effected in the sleeve inner bore, the plurality of fluid connections including a first fluid connection that connects the first bypass valve port and the second bypass valve port and a second fluid connection that connects the third bypass valve port and the fifth bypass valve port, wherein the first fluid connection is fluidly isolated from the second fluid connection,
• wherein:
• when the actuator is in the first state, the spool is in or transitions to the first position, and
• when the actuator is in the second state, the spool is in or transitions to the second position;
• and
• a biasing member disposed within the sleeve inner bore and extending between the first spool end and the second end of the sleeve, the biasing member biases the spool toward the first position.