Contamination of hydraulic oil due to internal damage of actuator

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  • Foreign Object Debris (FOD) such as iron powder are caused by internal damages in turbine valve hydraulic actuators. FOD circulates in the hydraulic system and causes the contamination of the hydraulic operating oil which accelerates the abrasion within the hydraulic actuators.
    In particular, it has a lethal impact on servo control valve (FAS, Shut-off valve) and emergency stop valve (ETS Solenoid valve) which are vulnerable to pollution of hydraulic operating oil. It is a major cause of the frequent breakdown and cutback (power generation reduction).
  • As shown in the picture above, the turbine valve hydraulic actuator must be disassembled from the main system and sent out for maintenance to an outsourcing company in order to check the internal damage condition.
  • Limitation of current maintenance technology for hydraulic actuators is that it must be visually checked by inspectors. TVAT has significantly improved the current method.
  • Performance Prediction Diagnostic Tester (TVAT) for Turbine Valve Hydraulic Actuators can be used to check the performance of turbine valve hydraulic actuators without disassembly of steam valve system. It can contribute greatly to the actual preventive maintenance, improvement of the maintenance reliability and the improvement of the operation efficiency.
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  • Improving power quality and increasing power generation efficiency can contribute to stable power generation