Patent ID: 11859553
Assignee: HAMILTON SUNDSTRAND CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
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.