US 12,146,461 B2
Dual valve fuel metering systems
Sachin Ramprashad, West Hartford, CT (US); and Todd Haugsjaahabink, Springfield, MA (US)
Assigned to Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on May 27, 2022, as Appl. No. 17/827,344.
Prior Publication US 2023/0383715 A1, Nov. 30, 2023
Int. Cl. F02M 59/20 (2006.01); F02D 41/30 (2006.01); F02M 59/46 (2006.01)
CPC F02M 59/20 (2013.01) [F02D 41/3005 (2013.01); F02M 59/462 (2013.01); F02M 59/466 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A dual valve fuel metering system comprising:
a flow path defined between a fuel inlet and a fuel outlet, wherein the flow path includes a primary flow path and a secondary flow path, wherein the fuel outlet is configured and adapted to be in fluid communication with at least one engine fuel manifold;
a primary flow metering valve configured and adapted to meter flow on the primary flow path;
a primary electrohydraulic servo valve configured to control a position of a piston of the primary flow metering valve;
a secondary flow metering valve configured and adapted to meter flow on the secondary flow path; and
a secondary electrohydraulic servo valve configured to control a position of a piston of the secondary flow metering valve;
a supply line fluidically connected to the primary electrohydraulic servo valve and to the secondary electrohydraulic servo valve, wherein the supply line is fluidically connected to the flow path upstream from a split between the primary flow path and the secondary flow path; and
a servo pressure regulating valve in the supply line, and
wherein the flow path is free from valve or metering devices between the servo pressure regulating valve and the split.