Study on Fault Monitoring of Hydraulic Control Outlet Valve of Centrifugal Pump

Now fault monitoring of hydraulic control outlet valve of centrifugal pump is still lacking in condition monitoring and fault diagnosis system of pumping station.Take a pumping station of a Yellow river diversion irrigation area as an example,the method of fault monitoring of hydraulic control outlet valve of centrifugal pump was proposed. Based on water hammer calculation the pressure head of pressure measuring point with time when operating pump was normal stop.Comparing with experiment result,the two were basically close. The pressure heads of pressure measuring point with time under maximum and minimum net head at certain closing law of hydraulic control valve when operating pump was normally shut down can be obtained by water hammer calculation and then sum of squares for the difference of pressure head under maximum and minimum net head at every moment in calculating period.The fault monitoring indicator ε of hydraulic control outlet valve of centrifugal pump can be obtained by correction. E can be obtained by the sum of squares for the difference of pressure head from water hammer calculation under maximum net head and measuring in operating of pump. If E is greater than ε,there may be a fault for hydraulic control outlet valve of centrifugal pump. After practical engineering application,the method of fault monitoring of hydraulic control outlet valve of centrifugal pump is effective.