水电站资料，求翻译，先谢了！

Powerstationvalveafternearly5yearsofoperation,throughtheusualcheckandsetB\Crepairfoundballvalveseal/maintenanceworksealinputbetweenthecavityandthereleaseandreleasecavitychamberandthevalvebodyexistsleakage.Powerstationin2010,2011respectivelyontheNo.1,No.2,No.3unitofvalvesealrepair.TheNo.1machine,processingissealedandfixedontheouterringsurfacecavitationaluminumbronzescar.Scarisrunthroughthetracesofwaterscouringabrasioncavitationafterleaving.Scratchalengthofabout50mm,scratchingdepthisabout1mm.TheconnectingrodvalveAofthenoactionindicatesthatthevalvedoesnotact.Theexpertanalysis,thehydraulicvibrationofthediversionsystemisself-excitedvibrationtypicalsteady-statepressurepulsation,themaximumvalueis2timesonthedoorofYouJinginletpressure.Causesofself-excitedvibrationis:inthevalvesealreleasebetweenthecavityandtheinputcavity:betweenthereleaseofballvalvebodycavityandtheseriousleakage,resultingintwocavitybecomesuniformpressure,causedbyworkslideringsealpressingincriticalstatecausedbytheaction,workingsealrepeatedlycastbackthedisturbanceofthesystem,causingvalvesealleakage,andleadtothecreationofhydraulicself-excitedvibration.Combiningthelastmaintenanceplanimplementationofthediversionsystemtoconductacomprehensiveinspectionandevaluationofhydraulicself-excitedvibrationmaycausedamage,strengthenhydraulicobservationandmonitoringofNo.2diversionsystem.Contactthefactorytoresearchonimprovementofstructureandmaterials,workingseal,inordertocompletelyeliminatetheleakageproblems.Theimprovedschemearrangementinthe2016maintenanceimplementation.Toaddappropriatewatersealingoperationsuggestedthatthecompanywillbethesameasthedesign,themanufacturercarefullystudyagreedontheimplementation,thecurrentcombinationofmaintenanceworkinaccordancewiththeaboverecommendationspreparedconcreteinterfacebasicwork.