Analysis on Pump-turbine Inlet Valve's Main Sealing Design
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Abstract
Inlet valve's main sealingof High-head pump-turbine play important role on its stability during the operation process. Varies design ruleswas conducted to enhancethe characteristics of theHigh-head pump-turbineby considering the influence of inlet valve's main sealinghardness difference on its stability.In this paper, the evolution of design theory for sealing has been studied, and then several typical design methods used in China were investigated, and finally this study play insight into the influence of inlet valve's main sealinghardness difference on itsbehavior of GZ-IIpump-turbinewith the field test data analyzing. Based on the study of the field test data, several conclusions can be drawn as follows: (i)differential hardness has significant effect on the damage of sealing surface and the damage degree increases with the increasing of the differential hardness between fixed and dynamic sealing rings; (ii) the damage degree reach its minimum value when the dynamic and fixed sealing rings have the same hardness. Therefore, the optimized design rule that controlling the differential hardness below ±35HBwas proposed to enhance its behavior ofthe High-head pump-turbine.
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