US 11,859,553 B2
Fluid injection systems having fluid line purging
Ryan Susca, Windsor, CT (US); Steve Doerner, Enfield, CT (US); and Charles E. Reuter, Granby, CT (US)
Assigned to Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Sep. 27, 2021, as Appl. No. 17/486,237.
Application 17/486,237 is a division of application No. 16/593,370, filed on Oct. 4, 2019, granted, now 11,156,163.
Prior Publication US 2022/0010730 A1, Jan. 13, 2022
Int. Cl. F02C 7/232 (2006.01); F02C 7/22 (2006.01); F23K 5/18 (2006.01); F23K 5/14 (2006.01); F23K 5/06 (2006.01); F02C 7/228 (2006.01); F02C 9/30 (2006.01)
CPC F02C 7/232 (2013.01) [F02C 7/222 (2013.01); F02C 7/228 (2013.01); F23K 5/06 (2013.01); F23K 5/147 (2013.01); F23K 5/18 (2013.01); F02C 9/30 (2013.01); F05D 2260/602 (2013.01); F05D 2260/607 (2013.01); F05D 2260/608 (2013.01); F23K 2300/206 (2020.05)] 5 Claims
OG exemplary drawing
 
1. A fuel system for a turbomachine, comprising:
a fluid injection system, comprising
a main flow line;
a primary flow line;
a secondary flow line;
a purge gas flow line;
a single controllable valve; and
a single passive valve,
wherein the primary flow line is in fluid communication with the purge gas line via the single passive valve and the secondary flow line is in fluid communication with the purge gas flow line via the single controllable valve,
wherein the single controllable valve and the single passive valve are arranged to permit selective and/or sequential purging of the secondary flow line and the primary flow line with purge gas from the purge gas flow line,
wherein:
in an operational mode, the single passive valve permits injectant flow through the primary flow line and the single controllable valve permits injectant flow through the secondary flow line, and
in a secondary flow line purge mode, the single controllable valve is configured to shut off injectant flow to the secondary flow line from the main flow line and simultaneously cause purge gas from the purge gas flow line to purge the secondary flow line while the single passive valve permits injectant to pass into the primary flow line from the main flow line.