In order to solve the issues such as the drops,fatigue damage and reduction of elasticity of the guide-vane facade seal rubber-strips in the long-term operation of hydropower units,the traditional rubber-strip sealing type is transformed into rigid-contact and hard sealing form in the transformation of the water-guide mechanism.The research results show that the maximum clearance of rigid-contact and hard facade sealing meets the maintenance process requirements under the condition of no oil pressure while the clearance of rigid-contact and hard facade sealing is 0 mm and the guide-vane opening meets the range of design values under the condition of oil pressure,and that in contrast to the rubber-sealing material,stainless steel material is extremely difficult to produce plastic deformation which might damage its structure,so as to reduce the water leakage from the guide-vane facade clearance,eliminate the phenomenon of hydraulic imbalance and unit vibration,improve the unit stability,and prevent unit rotation.
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