Why Discharge Valve Is Closed in Centrifugal Pump and Why We Close Discharge Valve of Centrifugal Pump Before Starting
Reasons for closing the discharge valve
The starting current can be reduced by closing the discharge control valve.
The current will be very high when any motor starts. When the pump is started with an open discharge valve, the discharge head will have greater resistance to the pump. Therefore, the motor must give the pump a larger starting torque, which means that the motor needs to draw more current.
If the discharge valves are closed when the pump is started, it means that there is no discharge head and minimum resistance to the pump, and therefore the output current is the smallest. Although the current is greater than the normal value when the motor starts, closing the nab discharge valve of the centrifugal pump can avoid additional load on the pump.
Situations when the discharge valve can be opened
The discharge valves can be opened when there is a check valve. If there is pressure on the discharge side of the centrifugal pump without a check valve when starting, the discharge valve should be closed. With a transparent plastic pipe[1], leakage can be easily found. It should be used with clear PVC fittings[2] to perform well. It's good to work with clear PVC pipe manufacturer[3] to solve problems together.
Risks of the unclosed discharge valve pump
Thinking from another aspect, if there are pressures at the discharge end of the pump, it may flow back into the pump before starting. And it will cause backward rotation, which can attract more current and cause damage to the pump. Therefore, it can be prevented by closing the discharge valve of the centrifugal pump when it starts.
If you want to know more about discharge valve function, please visit our website.
Weidouli Valves, founded in 1989, is a globe valve China manufacturer and supplier that specializes in the production of high alloy valves. With an increase of its production capacity and satisfaction of domestic and oversea client's requirement, Weidouli furnished with a new modern factory filled with advanced and large CNC machine facilities, fabrication, inspection and test facilities, total factory occupied area to be 43500㎡, becoming one of the leading valve maker and vendors in valve manufacturing industry.
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