Working Principle:​ Gas enters the valve through the inlet port from the system piping, flows through the precisely metered port, and exits toward the turbine combustion system. An external actuator receives command signals from the electronic controller and drives the spool to the target position, changing the gas flow cross-sectional area. The control system precisely manages valve opening to regulate fuel supply, thereby controlling turbine speed, output power, and exhaust temperature. The valve design ensures a deterministic and repeatable correspondence between flow and valve position throughout the full travel range.