Author(s)

Zhang Jian ¹

Affiliation(s)

¹ Shanghai Electric Gas Turbine Co., Ltd., Shanghai, China

Corresponding Author

Zhang Jian

ABSTRACT

Gas turbines serve as primary peak-shaving equipment in power grids. The emergency shut-off valve (ESV), the main fuel isolation valve, determines unit start/stop safety and response capability via its opening/closing speed. In a heavy-duty gas turbine series, hydraulic-driven ESVs experienced batch failures including delayed opening and overdue emergency closure. Investigation attributed slow opening to low-temperature oil viscosity increase, and closure delay after long open-hold to trapped oil between the trip solenoid and cartridge valve. Two optimizations were adopted: controller logic upgrade with manual exercising, and a 0.8 mm throttling drain orifice in the cartridge cover to eliminate trapped oil. Field tests verified that opening time was within 2 s, and total emergency closing time after static hold was below 300 ms, meeting design specifications. This solution is applicable to all models, offering an engineering reference for hydraulic ESV reliability and unit maintenance.

KEYWORDS

Emergency shut-off valve (ESV); Hydraulic actuator; Opening/closing lag; Logic optimization; Structural modification

CITE THIS PAPER

Zhang Jian. Study on Abnormal Action Analysis and Optimization Scheme of Gas Turbine Emergency Shut-Off Valve (ESV). Journal of Electrotechnology, Electrical Engineering and Management (2026). Vol. 9, No.1, 102-109. DOI: http://dx.doi.org/10.23977/jeeem.2026.090113.

REFERENCES

[1] Zhou L B. Gas Turbine Power Generation Technology [M]. Beijing: China Machine Press, 2020.
[2] Wang J W, Zhang H J, Huang Y. Hydraulic Transmission [M]. 4th ed. Beijing: China Machine Press, 2018.
[3] DL/T 1426‑2015, Operating code for combined cycle power generating unit [S]. Beijing: China Electric Power Press, 2015. 
[4] Liu J, Zhang L. Analysis and handling of jamming fault of hydraulic actuator for gas turbine fuel control valve [J]. Thermal Power Generation, 2021, 50(6): 112‑116. 
[5] Chen B. Hazards and elimination measures of trapped oil phenomenon in hydraulic systems [J]. Machine Tool & Hydraulics, 2019, 47(12): 134‑137.

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