US 12,071,899 B2
Pump system for a gas turbine engine
Todd Haugsjaahabink, Amherst, MA (US); and Ryan Shook, Loves Park, IL (US)
Assigned to HAMILTON SUNDSTRAND CORPORATION, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on May 15, 2023, as Appl. No. 18/197,499.
Application 18/197,499 is a continuation of application No. 17/408,330, filed on Aug. 20, 2021, granted, now 11,649,768.
Prior Publication US 2023/0304442 A1, Sep. 28, 2023
Int. Cl. F02C 7/236 (2006.01); F02C 7/232 (2006.01); F02C 9/28 (2006.01)
CPC F02C 7/236 (2013.01) [F02C 7/232 (2013.01); F02C 9/28 (2013.01); F05D 2270/301 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A pump system for a gas turbine engine comprising:
a fluid flow demand line for delivering fluid to an actuation or burner system;
a first pump connected to the fluid flow demand line;
a second pump connected, in parallel to the first pump, to the fluid flow demand line;
a bypass line fluidically connected to an inlet of the first pump and an inlet of the second pump;
a pressure regulating valve (PRV) comprising:
a valve window fluidically connecting the fluid flow demand line and the bypass line when the PRV is in an open position or a partially open position, and wherein the fluid flow demand line is fluidically disconnected from the bypass line when the PRV is in a closed position; and
a signal window, wherein the signal window is fluidically connected to the bypass line when the PRV is in the open position or the partially open position;
a bypass valve fluidically connecting an outlet of the second pump to the bypass line when the bypass valve is open, and fluidically disconnecting the outlet of the second pump from the bypass line when the bypass valve is closed;
a signal pressure line fluidically connecting the signal window to a control side of the bypass valve, wherein the signal window of the PRV fluidically connects the signal pressure line to the bypass line when the PRV is in the open position, and wherein the signal pressure line is fluidically disconnected from the bypass line when the PRV is in the closed position; and
an orifice line fluidically connecting the signal pressure line to the fluid flow demand line between the signal window and the bypass valve.